text: /*
  
     BLIS    
     An object-based framework for developing high-performance BLAS-like
     libraries.
  
     Copyright (C) 2014, The University of Texas
  
     Redistribution and use in source and binary forms, with or without
     modification, are permitted provided that the following conditions are
     met:
      - Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      - Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
      - Neither the name of The University of Texas nor the names of its
        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission.
  
     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     THEORY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  */
  
  #include "blis.h"
  
  void bli_sgemm_opt_8x4(
                          dim_t              k,
                          float* restrict    alpha,
                          float* restrict    a,
                          float* restrict    b,
                          float* restrict    beta,
                          float* restrict    c, inc_t rs_c, inc_t cs_c,
                          auxinfo_t*         data
                        )
  {
  	//void*   a_next = bli_auxinfo_next_a( data );
  	void*   b_next = bli_auxinfo_next_b( data );
  
  	dim_t   k_iter = k / 4;
  	dim_t   k_left = k % 4;
  
  	__asm__ volatile
  	(
  		"                                \n\t"
  		"                                \n\t"
  		"movq          %2, %%rax         \n\t" // load address of a.
  		"movq          %3, %%rbx         \n\t" // load address of b.
  		"movq          %9, %%r9          \n\t" // load address of b_next.
  		"                                \n\t"
  		"subq    $-8 * 16, %%rax         \n\t" // increment pointers to allow byte
  		"subq    $-8 * 16, %%rbx         \n\t" // offsets in the unrolled iterations.
  		"                                \n\t"
  		"movaps  -8 * 16(%%rax), %%xmm0  \n\t" // initialize loop by pre-loading elements
  		"movaps  -7 * 16(%%rax), %%xmm1  \n\t" // of a and b.
  		"movaps  -8 * 16(%%rbx), %%xmm2  \n\t"
  		"                                \n\t"
  		"movq          %6, %%rcx         \n\t" // load address of c
  		"movq          %8, %%rdi         \n\t" // load cs_c
  		"leaq        (,%%rdi,4), %%rdi   \n\t" // cs_c *= sizeof(float)
  		"movq       %%rdi, %%r12         \n\t" // make a copy of cs_c (in bytes)
  		"leaq   (%%rcx,%%rdi,2), %%r10   \n\t" // load address of c + 2*cs_c;
  		"                                \n\t"
  		"prefetcht2   0 * 4(%%r9)        \n\t" // prefetch b_next
  		"                                \n\t"
  		"xorpd     %%xmm3,  %%xmm3       \n\t"
  		"xorpd     %%xmm4,  %%xmm4       \n\t"
  		"xorpd     %%xmm5,  %%xmm5       \n\t"
  		"xorpd     %%xmm6,  %%xmm6       \n\t"
  		"                                \n\t"
  		"prefetcht0   6 * 4(%%rcx)       \n\t" // prefetch c + 0*cs_c
  		"xorpd     %%xmm8,  %%xmm8       \n\t"
  		"movaps    %%xmm8,  %%xmm9       \n\t"
  		"prefetcht0   6 * 4(%%rcx,%%rdi) \n\t" // prefetch c + 1*cs_c
  		"movaps    %%xmm8, %%xmm10       \n\t"
  		"movaps    %%xmm8, %%xmm11       \n\t"
  		"prefetcht0   6 * 4(%%r10)       \n\t" // prefetch c + 2*cs_c
  		"movaps    %%xmm8, %%xmm12       \n\t"
  		"movaps    %%xmm8, %%xmm13       \n\t"
  		"prefetcht0   6 * 4(%%r10,%%rdi) \n\t" // prefetch c + 3*cs_c
  		"movaps    %%xmm8, %%xmm14       \n\t"
  		"movaps    %%xmm8, %%xmm15       \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movq      %0, %%rsi             \n\t" // i = k_iter;
  		"testq  %%rsi, %%rsi             \n\t" // check i via logical AND.
  		"je     .SCONSIDKLEFT            \n\t" // if i == 0, jump to code that
  		"                                \n\t" // contains the k_left loop.
  		"                                \n\t"
  		"                                \n\t"
  		".SLOOPKITER:                    \n\t" // MAIN LOOP
  		"                                \n\t"
  		"prefetcht0  (4*35+1) * 8(%%rax) \n\t"
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t" // iteration 0
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"movaps  %%xmm2, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm2, %%xmm7  \n\t"
  		"mulps   %%xmm0, %%xmm2          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"movaps  %%xmm7, %%xmm5          \n\t"
  		"pshufd   $0x39, %%xmm7, %%xmm6  \n\t"
  		"mulps   %%xmm0, %%xmm7          \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"                                \n\t"
  		"addps   %%xmm2, %%xmm8          \n\t"
  		"movaps  -7 * 16(%%rbx), %%xmm2  \n\t"
  		"addps   %%xmm3, %%xmm12         \n\t"
  		"movaps  %%xmm6, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm6, %%xmm4  \n\t"
  		"mulps   %%xmm0, %%xmm6          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm7, %%xmm9          \n\t"
  		"addps   %%xmm5, %%xmm13         \n\t"
  		"movaps  %%xmm4, %%xmm5          \n\t"
  		"mulps   %%xmm0, %%xmm4          \n\t"
  		"movaps  -6 * 16(%%rax), %%xmm0  \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"movaps  -5 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t" // iteration 1
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"movaps  %%xmm2, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm2, %%xmm7  \n\t"
  		"mulps   %%xmm0, %%xmm2          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"movaps  %%xmm7, %%xmm5          \n\t"
  		"pshufd   $0x39, %%xmm7, %%xmm6  \n\t"
  		"mulps   %%xmm0, %%xmm7          \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"                                \n\t"
  		"addps   %%xmm2, %%xmm8          \n\t"
  		"movaps  -6 * 16(%%rbx), %%xmm2  \n\t"
  		"addps   %%xmm3, %%xmm12         \n\t"
  		"movaps  %%xmm6, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm6, %%xmm4  \n\t"
  		"mulps   %%xmm0, %%xmm6          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm7, %%xmm9          \n\t"
  		"addps   %%xmm5, %%xmm13         \n\t"
  		"movaps  %%xmm4, %%xmm5          \n\t"
  		"mulps   %%xmm0, %%xmm4          \n\t"
  		"movaps  -4 * 16(%%rax), %%xmm0  \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"movaps  -3 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t" // iteration 2
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"movaps  %%xmm2, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm2, %%xmm7  \n\t"
  		"mulps   %%xmm0, %%xmm2          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"movaps  %%xmm7, %%xmm5          \n\t"
  		"pshufd   $0x39, %%xmm7, %%xmm6  \n\t"
  		"mulps   %%xmm0, %%xmm7          \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"                                \n\t"
  		"addps   %%xmm2, %%xmm8          \n\t"
  		"movaps  -5 * 16(%%rbx), %%xmm2  \n\t"
  		"addps   %%xmm3, %%xmm12         \n\t"
  		"movaps  %%xmm6, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm6, %%xmm4  \n\t"
  		"mulps   %%xmm0, %%xmm6          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm7, %%xmm9          \n\t"
  		"addps   %%xmm5, %%xmm13         \n\t"
  		"movaps  %%xmm4, %%xmm5          \n\t"
  		"mulps   %%xmm0, %%xmm4          \n\t"
  		"movaps  -2 * 16(%%rax), %%xmm0  \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"movaps  -1 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t" // iteration 3
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"movaps  %%xmm2, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm2, %%xmm7  \n\t"
  		"mulps   %%xmm0, %%xmm2          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 8 * 4, %%rax        \n\t" // a += 4*8 (unroll x mr)
  		"                                \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"movaps  %%xmm7, %%xmm5          \n\t"
  		"pshufd   $0x39, %%xmm7, %%xmm6  \n\t"
  		"mulps   %%xmm0, %%xmm7          \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 4 * 4, %%r9         \n\t" // b_next += 4*4 (unroll x nr)
  		"                                \n\t"
  		"addps   %%xmm2, %%xmm8          \n\t"
  		"movaps  -4 * 16(%%rbx), %%xmm2  \n\t"
  		"addps   %%xmm3, %%xmm12         \n\t"
  		"movaps  %%xmm6, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm6, %%xmm4  \n\t"
  		"mulps   %%xmm0, %%xmm6          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 4 * 4, %%rbx        \n\t" // b += 4*4 (unroll x nr)
  		"                                \n\t"
  		"addps   %%xmm7, %%xmm9          \n\t"
  		"addps   %%xmm5, %%xmm13         \n\t"
  		"movaps  %%xmm4, %%xmm5          \n\t"
  		"mulps   %%xmm0, %%xmm4          \n\t"
  		"movaps  -8 * 16(%%rax), %%xmm0  \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"movaps  -7 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"prefetcht2        0 * 4(%%r9)   \n\t" // prefetch b_next[0]
  		"prefetcht2       16 * 4(%%r9)   \n\t" // prefetch b_next[16]
  		"                                \n\t"
  		"                                \n\t"
  		"decq   %%rsi                    \n\t" // i -= 1;
  		"jne    .SLOOPKITER              \n\t" // iterate again if i != 0.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SCONSIDKLEFT:                  \n\t"
  		"                                \n\t"
  		"movq      %1, %%rsi             \n\t" // i = k_left;
  		"testq  %%rsi, %%rsi             \n\t" // check i via logical AND.
  		"je     .SPOSTACCUM              \n\t" // if i == 0, we're done; jump to end.
  		"                                \n\t" // else, we prepare to enter k_left loop.
  		"                                \n\t"
  		"                                \n\t"
  		".SLOOPKLEFT:                    \n\t" // EDGE LOOP
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t" // iteration 0
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"movaps  %%xmm2, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm2, %%xmm7  \n\t"
  		"mulps   %%xmm0, %%xmm2          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"movaps  %%xmm7, %%xmm5          \n\t"
  		"pshufd   $0x39, %%xmm7, %%xmm6  \n\t"
  		"mulps   %%xmm0, %%xmm7          \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"                                \n\t"
  		"addps   %%xmm2, %%xmm8          \n\t"
  		"movaps  -7 * 16(%%rbx), %%xmm2  \n\t"
  		"addps   %%xmm3, %%xmm12         \n\t"
  		"movaps  %%xmm6, %%xmm3          \n\t"
  		"pshufd   $0x39, %%xmm6, %%xmm4  \n\t"
  		"mulps   %%xmm0, %%xmm6          \n\t"
  		"mulps   %%xmm1, %%xmm3          \n\t"
  		"                                \n\t"
  		"addps   %%xmm7, %%xmm9          \n\t"
  		"addps   %%xmm5, %%xmm13         \n\t"
  		"movaps  %%xmm4, %%xmm5          \n\t"
  		"mulps   %%xmm0, %%xmm4          \n\t"
  		"movaps  -6 * 16(%%rax), %%xmm0  \n\t"
  		"mulps   %%xmm1, %%xmm5          \n\t"
  		"movaps  -5 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"subq  $-1 * 8 * 4, %%rax        \n\t" // a += 8 (1 x mr)
  		"subq  $-1 * 4 * 4, %%rbx        \n\t" // b += 4 (1 x nr)
  		"                                \n\t"
  		"                                \n\t"
  		"decq   %%rsi                    \n\t" // i -= 1;
  		"jne    .SLOOPKLEFT              \n\t" // iterate again if i != 0.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SPOSTACCUM:                    \n\t"
  		"                                \n\t"
  		"addps   %%xmm6, %%xmm10         \n\t"
  		"addps   %%xmm3, %%xmm14         \n\t"
  		"addps   %%xmm4, %%xmm11         \n\t"
  		"addps   %%xmm5, %%xmm15         \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movq    %4, %%rax               \n\t" // load address of alpha
  		"movq    %5, %%rbx               \n\t" // load address of beta 
  		"movss   (%%rax), %%xmm6         \n\t" // load alpha to bottom 4 bytes of xmm6
  		"movss   (%%rbx), %%xmm7         \n\t" // load beta to bottom 4 bytes of xmm7
  		"pshufd  $0x00, %%xmm6, %%xmm6   \n\t" // populate xmm6 with four alphas
  		"pshufd  $0x00, %%xmm7, %%xmm7   \n\t" // populate xmm7 with four betas
  		"                                \n\t"
  		"                                \n\t"
  		"movq    %7, %%rsi               \n\t" // load rs_c
  		"movq    %%rsi, %%r8             \n\t" // make a copy of rs_c
  		"                                \n\t"
  		"leaq    (,%%rsi,4), %%rsi       \n\t" // rsi = rs_c * sizeof(float)
  		"leaq    (%%rsi,%%rsi,2), %%r11  \n\t" // r11 = 3*(rs_c * sizeof(float))
  		"                                \n\t"
  		"leaq   (%%rcx,%%rsi,4), %%rdx   \n\t" // load address of c + 4*rs_c;
  		"                                \n\t"
  		"                                \n\t" // xmm8:   xmm9:   xmm10:  xmm11:
  		"                                \n\t" // ( ab00  ( ab01  ( ab02  ( ab03
  		"                                \n\t" //   ab11    ab12    ab13    ab10
  		"                                \n\t" //   ab22    ab23    ab20    ab21
  		"                                \n\t" //   ab33 )  ab30 )  ab31 )  ab32 )
  		"                                \n\t" //
  		"                                \n\t" // xmm12:  xmm13:  xmm14:  xmm15:
  		"                                \n\t" // ( ab40  ( ab41  ( ab42  ( ab43
  		"                                \n\t" //   ab51    ab52    ab53    ab50
  		"                                \n\t" //   ab62    ab63    ab60    ab61
  		"                                \n\t" //   ab73 )  ab70 )  ab71 )  ab72 )
  		"movaps  %%xmm9, %%xmm4          \n\t"
  		"shufps   $0xd8, %%xmm8,  %%xmm9 \n\t"
  		"shufps   $0xd8, %%xmm11, %%xmm8 \n\t"
  		"shufps   $0xd8, %%xmm10, %%xmm11\n\t"
  		"shufps   $0xd8, %%xmm4,  %%xmm10\n\t"
  		"                                \n\t"
  		"movaps  %%xmm8, %%xmm4          \n\t"
  		"shufps   $0xd8, %%xmm10, %%xmm8 \n\t"
  		"shufps   $0xd8, %%xmm4, %%xmm10 \n\t"
  		"movaps  %%xmm9, %%xmm5          \n\t"
  		"shufps   $0xd8, %%xmm11, %%xmm9 \n\t"
  		"shufps   $0xd8, %%xmm5, %%xmm11 \n\t"
  		"                                \n\t"
  		"movaps  %%xmm13, %%xmm4         \n\t"
  		"shufps   $0xd8, %%xmm12, %%xmm13\n\t"
  		"shufps   $0xd8, %%xmm15, %%xmm12\n\t"
  		"shufps   $0xd8, %%xmm14, %%xmm15\n\t"
  		"shufps   $0xd8, %%xmm4,  %%xmm14\n\t"
  		"                                \n\t"
  		"movaps  %%xmm12, %%xmm4         \n\t"
  		"shufps   $0xd8, %%xmm14, %%xmm12\n\t"
  		"shufps   $0xd8, %%xmm4, %%xmm14 \n\t"
  		"movaps  %%xmm13, %%xmm5         \n\t"
  		"shufps   $0xd8, %%xmm15, %%xmm13\n\t"
  		"shufps   $0xd8, %%xmm5, %%xmm15 \n\t"
  		"                                \n\t" // xmm8:   xmm9:   xmm10:  xmm11:
  		"                                \n\t" // ( ab00  ( ab01  ( ab02  ( ab03
  		"                                \n\t" //   ab10    ab11    ab12    ab13
  		"                                \n\t" //   ab20    ab21    ab22    ab23
  		"                                \n\t" //   ab30 )  ab31 )  ab32 )  ab33 )
  		"                                \n\t" //
  		"                                \n\t" // xmm12:  xmm13:  xmm14:  xmm15:
  		"                                \n\t" // ( ab40  ( ab41  ( ab42  ( ab43
  		"                                \n\t" //   ab50    ab51    ab52    ab53
  		"                                \n\t" //   ab60    ab61    ab62    ab63
  		"                                \n\t" //   ab70 )  ab71 )  ab72 )  ab73 )
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // determine if
  		"                                \n\t" //   c      % 16 == 0, AND
  		"                                \n\t" //   8*cs_c % 16 == 0, AND
  		"                                \n\t" //   rs_c        == 1
  		"                                \n\t" // ie: aligned, ldim aligned, and
  		"                                \n\t" // column-stored
  		"                                \n\t"
  		"cmpq       $1, %%r8             \n\t" // set ZF if rs_c == 1.
  		"sete           %%bl             \n\t" // bl = ( ZF == 1 ? 1 : 0 );
  		"testq     $15, %%rcx            \n\t" // set ZF if c & 16 is zero.
  		"setz           %%bh             \n\t" // bh = ( ZF == 1 ? 1 : 0 );
  		"testq     $15, %%r12            \n\t" // set ZF if (4*cs_c) & 16 is zero.
  		"setz           %%al             \n\t" // al = ( ZF == 1 ? 1 : 0 );
  		"                                \n\t" // and(bl,bh) followed by
  		"                                \n\t" // and(bh,al) will reveal result
  		"                                \n\t"
  		"                                \n\t" // now avoid loading C if beta == 0
  		"                                \n\t"
  		"xorpd     %%xmm0,  %%xmm0       \n\t" // set xmm0 to zero.
  		"ucomisd   %%xmm0,  %%xmm7       \n\t" // check if beta == 0.
  		"je      .SBETAZERO              \n\t" // if ZF = 1, jump to beta == 0 case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // check if aligned/column-stored
  		"andb     %%bl, %%bh             \n\t" // set ZF if bl & bh == 1.
  		"andb     %%bh, %%al             \n\t" // set ZF if bh & al == 1.
  		"jne     .SCOLSTORED             \n\t" // jump to column storage case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SGENSTORED:                    \n\t"
  		"                                \n\t"
  		"movlps  (%%rcx        ), %%xmm0 \n\t" // load c00 ~ c30
  		"movhps  (%%rcx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rcx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rcx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm8,  %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rcx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rcx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rcx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rcx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rdx        ), %%xmm0 \n\t" // load c40 ~ c70
  		"movhps  (%%rdx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rdx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rdx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm12, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rdx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rdx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rdx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rdx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rcx        ), %%xmm0 \n\t" // load c01 ~ c31
  		"movhps  (%%rcx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rcx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rcx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm9,  %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rcx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rcx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rcx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rcx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rdx        ), %%xmm0 \n\t" // load c41 ~ c71
  		"movhps  (%%rdx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rdx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rdx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm13, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rdx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rdx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rdx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rdx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rcx        ), %%xmm0 \n\t" // load c02 ~ c32
  		"movhps  (%%rcx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rcx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rcx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm10, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rcx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rcx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rcx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rcx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rdx        ), %%xmm0 \n\t" // load c42 ~ c72
  		"movhps  (%%rdx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rdx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rdx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm14, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rdx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rdx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rdx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rdx,%%r11  ) \n\t"
  		"                                \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rcx        ), %%xmm0 \n\t" // load c03 ~ c33
  		"movhps  (%%rcx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rcx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rcx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm11, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rcx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rcx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rcx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rcx,%%r11  ) \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlps  (%%rdx        ), %%xmm0 \n\t" // load c43 ~ c73
  		"movhps  (%%rdx,%%rsi,1), %%xmm0 \n\t"
  		"movlps  (%%rdx,%%rsi,2), %%xmm1 \n\t"
  		"movhps  (%%rdx,%%r11  ), %%xmm1 \n\t"
  		"shufps    $0x88, %%xmm1, %%xmm0 \n\t"
  		"                                \n\t"
  		"mulps   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm15, %%xmm0         \n\t" // add the gemm result,
  		"                                \n\t"
  		"movss   %%xmm0, (%%rdx        ) \n\t" // and store back to memory.
  		"pshufd    $0x39, %%xmm0, %%xmm1 \n\t"
  		"movss   %%xmm1, (%%rdx,%%rsi,1) \n\t"
  		"pshufd    $0x39, %%xmm1, %%xmm2 \n\t"
  		"movss   %%xmm2, (%%rdx,%%rsi,2) \n\t"
  		"pshufd    $0x39, %%xmm2, %%xmm3 \n\t"
  		"movss   %%xmm3, (%%rdx,%%r11  ) \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"jmp    .SDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SCOLSTORED:                    \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c00 ~ c30,
  		"mulps   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm8,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c40 ~ c70,
  		"mulps   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addps  %%xmm12,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c01 ~ c31,
  		"mulps   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps   %%xmm9,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c41 ~ c71,
  		"mulps   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addps  %%xmm13,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c02 ~ c32,
  		"mulps   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps  %%xmm10,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c42 ~ c72,
  		"mulps   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addps  %%xmm14,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c03 ~ c33,
  		"mulps   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addps  %%xmm11,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c43 ~ c73,
  		"mulps   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"mulps   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addps  %%xmm15,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"jmp    .SDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SBETAZERO:                     \n\t"
  		"                                \n\t" // check if aligned/column-stored
  		"andb     %%bl, %%bh             \n\t" // set ZF if bl & bh == 1.
  		"andb     %%bh, %%al             \n\t" // set ZF if bh & al == 1.
  		"jne     .SCOLSTORBZ             \n\t" // jump to column storage case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SGENSTORBZ:                    \n\t"
  		"                                \n\t"
  		"jmp    .SGENSTORED              \n\t" // use gen-stored beta != 0 case for now
  		//"jmp    .SDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SCOLSTORBZ:                    \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c00 ~ c30,
  		"mulps   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"movaps  %%xmm8,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c40 ~ c70,
  		"mulps   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"movaps  %%xmm12, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c01 ~ c31,
  		"mulps   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"movaps  %%xmm9,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c41 ~ c71,
  		"mulps   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"movaps  %%xmm13, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c02 ~ c32,
  		"mulps   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"movaps  %%xmm10, (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c42 ~ c72,
  		"mulps   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"movaps  %%xmm14, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c03 ~ c33,
  		"mulps   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"movaps  %%xmm11, (%%rcx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t" // skip loading c43 ~ c73,
  		"mulps   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"movaps  %%xmm15, (%%rdx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".SDONE:                         \n\t"
  		"                                \n\t"
  
  		: // output operands (none)
  		: // input operands
  		  "m" (k_iter),
  		  "m" (k_left),
  		  "m" (a),
  		  "m" (b),
  		  "m" (alpha),
  		  "m" (beta),
  		  "m" (c),
  		  "m" (rs_c),
  		  "m" (cs_c),
  		  "m" (b_next)
  		: // register clobber list
  		  "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "r8", "r9", "r10", "r11", "r12",
  		  "xmm0", "xmm1", "xmm2", "xmm3",
  		  "xmm4", "xmm5", "xmm6", "xmm7",
  		  "xmm8", "xmm9", "xmm10", "xmm11",
  		  "xmm12", "xmm13", "xmm14", "xmm15",
  		  "memory"
  	);
  }
  
  void bli_dgemm_opt_4x4(
                          dim_t              k,
                          double* restrict   alpha,
                          double* restrict   a,
                          double* restrict   b,
                          double* restrict   beta,
                          double* restrict   c, inc_t rs_c, inc_t cs_c,
                          auxinfo_t*         data
                        )
  {
  	void*   a_next = bli_auxinfo_next_a( data );
  	void*   b_next = bli_auxinfo_next_b( data );
  
  	dim_t   k_iter = k / 4;
  	dim_t   k_left = k % 4;
  
  	__asm__ volatile
  	(
  		"                                \n\t"
  		"                                \n\t"
  		"movq          %2, %%rax         \n\t" // load address of a.
  		"movq          %3, %%rbx         \n\t" // load address of b.
  		"movq          %9, %%r9          \n\t" // load address of b_next.
  		"movq         %10, %%r11         \n\t" // load address of a_next.
  		"                                \n\t"
  		"subq    $-8 * 16, %%rax         \n\t" // increment pointers to allow byte
  		"subq    $-8 * 16, %%rbx         \n\t" // offsets in the unrolled iterations.
  		"                                \n\t"
  		"movaps  -8 * 16(%%rax), %%xmm0  \n\t" // initialize loop by pre-loading elements
  		"movaps  -7 * 16(%%rax), %%xmm1  \n\t" // of a and b.
  		"movaps  -8 * 16(%%rbx), %%xmm2  \n\t"
  		"                                \n\t"
  		"movq          %6, %%rcx         \n\t" // load address of c
  		"movq          %8, %%rdi         \n\t" // load cs_c
  		"leaq        (,%%rdi,8), %%rdi   \n\t" // cs_c *= sizeof(double)
  		"movq       %%rdi, %%r12         \n\t" // make a copy of cs_c (in bytes)
  		"leaq   (%%rcx,%%rdi,2), %%r10   \n\t" // load address of c + 2*cs_c;
  		"                                \n\t"
  		"prefetcht2   0 * 8(%%r9)        \n\t" // prefetch b_next
  		"                                \n\t"
  		"xorpd     %%xmm3,  %%xmm3       \n\t"
  		"xorpd     %%xmm4,  %%xmm4       \n\t"
  		"xorpd     %%xmm5,  %%xmm5       \n\t"
  		"xorpd     %%xmm6,  %%xmm6       \n\t"
  		"                                \n\t"
  		"prefetcht2   3 * 8(%%rcx)       \n\t" // prefetch c + 0*cs_c
  		"xorpd     %%xmm8,  %%xmm8       \n\t"
  		"movaps    %%xmm8,  %%xmm9       \n\t"
  		"prefetcht2   3 * 8(%%rcx,%%rdi) \n\t" // prefetch c + 1*cs_c
  		"movaps    %%xmm8, %%xmm10       \n\t"
  		"movaps    %%xmm8, %%xmm11       \n\t"
  		"prefetcht2   3 * 8(%%r10)       \n\t" // prefetch c + 2*cs_c
  		"movaps    %%xmm8, %%xmm12       \n\t"
  		"movaps    %%xmm8, %%xmm13       \n\t"
  		"prefetcht2   3 * 8(%%r10,%%rdi) \n\t" // prefetch c + 3*cs_c
  		"movaps    %%xmm8, %%xmm14       \n\t"
  		"movaps    %%xmm8, %%xmm15       \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movq      %0, %%rsi             \n\t" // i = k_iter;
  		"testq  %%rsi, %%rsi             \n\t" // check i via logical AND.
  		"je     .DCONSIDKLEFT            \n\t" // if i == 0, jump to code that
  		"                                \n\t" // contains the k_left loop.
  		"                                \n\t"
  		"                                \n\t"
  		".DLOOPKITER:                    \n\t" // MAIN LOOP
  		"                                \n\t"
  		"prefetcht0  (4*35+1) * 8(%%rax) \n\t"
  		//"prefetcht0  (8*97+4) * 8(%%rax) \n\t"
  		"                                \n\t"
  		//"prefetcht0  67*4 * 8(%%r11)       \n\t" // prefetch a_next[0]
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t" // iteration 0
  		"movaps  -7 * 16(%%rbx), %%xmm3  \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"movaps  %%xmm2, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm2, %%xmm7  \n\t"
  		"mulpd   %%xmm0, %%xmm2          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"movaps  %%xmm7, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm7          \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm2, %%xmm9          \n\t"
  		"movaps  -6 * 16(%%rbx), %%xmm2  \n\t"
  		"addpd   %%xmm4, %%xmm13         \n\t"
  		"movaps  %%xmm3, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm3, %%xmm5  \n\t"
  		"mulpd   %%xmm0, %%xmm3          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm7, %%xmm8          \n\t"
  		"addpd   %%xmm6, %%xmm12         \n\t"
  		"movaps  %%xmm5, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm5          \n\t"
  		"movaps  -6 * 16(%%rax), %%xmm0  \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"movaps  -5 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t" // iteration 1
  		"movaps  -5 * 16(%%rbx), %%xmm3  \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"movaps  %%xmm2, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm2, %%xmm7  \n\t"
  		"mulpd   %%xmm0, %%xmm2          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"movaps  %%xmm7, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm7          \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm2, %%xmm9          \n\t"
  		"movaps  -4 * 16(%%rbx), %%xmm2  \n\t"
  		"addpd   %%xmm4, %%xmm13         \n\t"
  		"movaps  %%xmm3, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm3, %%xmm5  \n\t"
  		"mulpd   %%xmm0, %%xmm3          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm7, %%xmm8          \n\t"
  		"addpd   %%xmm6, %%xmm12         \n\t"
  		"movaps  %%xmm5, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm5          \n\t"
  		"movaps  -4 * 16(%%rax), %%xmm0  \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"movaps  -3 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"prefetcht0  (4*37+1) * 8(%%rax) \n\t"
  		//"prefetcht0  (8*97+12)* 8(%%rax) \n\t"
  		"                                \n\t"
  		//"prefetcht0  69*4 * 8(%%r11)       \n\t" // prefetch a_next[8]
  		//"subq  $-4 * 4 * 8, %%r11        \n\t" // a_next += 4*4 (unroll x mr)
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t" // iteration 2
  		"movaps  -3 * 16(%%rbx), %%xmm3  \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"movaps  %%xmm2, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm2, %%xmm7  \n\t"
  		"mulpd   %%xmm0, %%xmm2          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"movaps  %%xmm7, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm7          \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm2, %%xmm9          \n\t"
  		"movaps  -2 * 16(%%rbx), %%xmm2  \n\t"
  		"addpd   %%xmm4, %%xmm13         \n\t"
  		"movaps  %%xmm3, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm3, %%xmm5  \n\t"
  		"mulpd   %%xmm0, %%xmm3          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addpd   %%xmm7, %%xmm8          \n\t"
  		"addpd   %%xmm6, %%xmm12         \n\t"
  		"movaps  %%xmm5, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm5          \n\t"
  		"movaps  -2 * 16(%%rax), %%xmm0  \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"movaps  -1 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t" // iteration 3
  		"movaps  -1 * 16(%%rbx), %%xmm3  \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"movaps  %%xmm2, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm2, %%xmm7  \n\t"
  		"mulpd   %%xmm0, %%xmm2          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 4 * 8, %%rax        \n\t" // a += 4*4 (unroll x mr)
  		"                                \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"movaps  %%xmm7, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm7          \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 4 * 8, %%r9         \n\t" // b_next += 4*4 (unroll x nr)
  		"                                \n\t"
  		"addpd   %%xmm2, %%xmm9          \n\t"
  		"movaps   0 * 16(%%rbx), %%xmm2  \n\t"
  		"addpd   %%xmm4, %%xmm13         \n\t"
  		"movaps  %%xmm3, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm3, %%xmm5  \n\t"
  		"mulpd   %%xmm0, %%xmm3          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"subq  $-4 * 4 * 8, %%rbx        \n\t" // b += 4*4 (unroll x nr)
  		"                                \n\t"
  		"addpd   %%xmm7, %%xmm8          \n\t"
  		"addpd   %%xmm6, %%xmm12         \n\t"
  		"movaps  %%xmm5, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm5          \n\t"
  		"movaps  -8 * 16(%%rax), %%xmm0  \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"movaps  -7 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"prefetcht2        0 * 8(%%r9)   \n\t" // prefetch b_next[0]
  		"prefetcht2        8 * 8(%%r9)   \n\t" // prefetch b_next[8]
  		"                                \n\t"
  		"decq   %%rsi                    \n\t" // i -= 1;
  		"jne    .DLOOPKITER              \n\t" // iterate again if i != 0.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		//"prefetcht2       -8 * 8(%%r9)   \n\t" // prefetch b_next[-8]
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DCONSIDKLEFT:                  \n\t"
  		"                                \n\t"
  		"movq      %1, %%rsi             \n\t" // i = k_left;
  		"testq  %%rsi, %%rsi             \n\t" // check i via logical AND.
  		"je     .DPOSTACCUM              \n\t" // if i == 0, we're done; jump to end.
  		"                                \n\t" // else, we prepare to enter k_left loop.
  		"                                \n\t"
  		"                                \n\t"
  		".DLOOPKLEFT:                    \n\t" // EDGE LOOP
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t" // iteration 0
  		"movaps  -7 * 16(%%rbx), %%xmm3  \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"movaps  %%xmm2, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm2, %%xmm7  \n\t"
  		"mulpd   %%xmm0, %%xmm2          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"movaps  %%xmm7, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm7          \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm2, %%xmm9          \n\t"
  		"movaps  -6 * 16(%%rbx), %%xmm2  \n\t"
  		"addpd   %%xmm4, %%xmm13         \n\t"
  		"movaps  %%xmm3, %%xmm4          \n\t"
  		"pshufd   $0x4e, %%xmm3, %%xmm5  \n\t"
  		"mulpd   %%xmm0, %%xmm3          \n\t"
  		"mulpd   %%xmm1, %%xmm4          \n\t"
  		"                                \n\t"
  		"addpd   %%xmm7, %%xmm8          \n\t"
  		"addpd   %%xmm6, %%xmm12         \n\t"
  		"movaps  %%xmm5, %%xmm6          \n\t"
  		"mulpd   %%xmm0, %%xmm5          \n\t"
  		"movaps  -6 * 16(%%rax), %%xmm0  \n\t"
  		"mulpd   %%xmm1, %%xmm6          \n\t"
  		"movaps  -5 * 16(%%rax), %%xmm1  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"subq  $-4 * 1 * 8, %%rax        \n\t" // a += 4 (1 x mr)
  		"subq  $-4 * 1 * 8, %%rbx        \n\t" // b += 4 (1 x nr)
  		"                                \n\t"
  		"                                \n\t"
  		"decq   %%rsi                    \n\t" // i -= 1;
  		"jne    .DLOOPKLEFT              \n\t" // iterate again if i != 0.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DPOSTACCUM:                    \n\t"
  		"                                \n\t"
  		"addpd   %%xmm3, %%xmm11         \n\t"
  		"addpd   %%xmm4, %%xmm15         \n\t"
  		"addpd   %%xmm5, %%xmm10         \n\t"
  		"addpd   %%xmm6, %%xmm14         \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movq    %4, %%rax               \n\t" // load address of alpha
  		"movq    %5, %%rbx               \n\t" // load address of beta 
  		"movddup (%%rax), %%xmm6         \n\t" // load alpha and duplicate
  		"movddup (%%rbx), %%xmm7         \n\t" // load beta and duplicate
  		"                                \n\t"
  		"                                \n\t"
  		"movq    %7, %%rsi               \n\t" // load rs_c
  		"movq    %%rsi, %%r8             \n\t" // make a copy of rs_c
  		"                                \n\t"
  		"leaq    (,%%rsi,8), %%rsi       \n\t" // rsi = rs_c * sizeof(double)
  		"                                \n\t"
  		"leaq   (%%rcx,%%rsi,2), %%rdx   \n\t" // load address of c + 2*rs_c;
  		"                                \n\t"
  		"                                \n\t" // xmm8:   xmm9:   xmm10:  xmm11:
  		"                                \n\t" // ( ab01  ( ab00  ( ab03  ( ab02
  		"                                \n\t" //   ab10 )  ab11 )  ab12 )  ab13 )
  		"                                \n\t" //
  		"                                \n\t" // xmm12:  xmm13:  xmm14:  xmm15:
  		"                                \n\t" // ( ab21  ( ab20  ( ab23  ( ab22
  		"                                \n\t" //   ab30 )  ab31 )  ab32 )  ab33 )
  		"movaps   %%xmm8,  %%xmm0        \n\t"
  		"movsd    %%xmm9,  %%xmm8        \n\t"
  		"movsd    %%xmm0,  %%xmm9        \n\t"
  		"                                \n\t"
  		"movaps  %%xmm10,  %%xmm0        \n\t"
  		"movsd   %%xmm11, %%xmm10        \n\t"
  		"movsd    %%xmm0, %%xmm11        \n\t"
  		"                                \n\t"
  		"movaps  %%xmm12,  %%xmm0        \n\t"
  		"movsd   %%xmm13, %%xmm12        \n\t"
  		"movsd    %%xmm0, %%xmm13        \n\t"
  		"                                \n\t"
  		"movaps  %%xmm14,  %%xmm0        \n\t"
  		"movsd   %%xmm15, %%xmm14        \n\t"
  		"movsd    %%xmm0, %%xmm15        \n\t"
  		"                                \n\t" // xmm8:   xmm9:   xmm10:  xmm11:
  		"                                \n\t" // ( ab00  ( ab01  ( ab02  ( ab03
  		"                                \n\t" //   ab10 )  ab11 )  ab12 )  ab13 )
  		"                                \n\t" //
  		"                                \n\t" // xmm12:  xmm13:  xmm14:  xmm15:
  		"                                \n\t" // ( ab20  ( ab21  ( ab22  ( ab23
  		"                                \n\t" //   ab30 )  ab31 )  ab32 )  ab33 )
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // determine if
  		"                                \n\t" //   c      % 16 == 0, AND
  		"                                \n\t" //   8*cs_c % 16 == 0, AND
  		"                                \n\t" //   rs_c        == 1
  		"                                \n\t" // ie: aligned, ldim aligned, and
  		"                                \n\t" // column-stored
  		"                                \n\t"
  		"cmpq       $1, %%r8             \n\t" // set ZF if rs_c == 1.
  		"sete           %%bl             \n\t" // bl = ( ZF == 1 ? 1 : 0 );
  		"testq     $15, %%rcx            \n\t" // set ZF if c & 16 is zero.
  		"setz           %%bh             \n\t" // bh = ( ZF == 1 ? 1 : 0 );
  		"testq     $15, %%r12            \n\t" // set ZF if (8*cs_c) & 16 is zero.
  		"setz           %%al             \n\t" // al = ( ZF == 1 ? 1 : 0 );
  		"                                \n\t" // and(bl,bh) followed by
  		"                                \n\t" // and(bh,al) will reveal result
  		"                                \n\t"
  		"                                \n\t" // now avoid loading C if beta == 0
  		"                                \n\t"
  		"xorpd     %%xmm0,  %%xmm0       \n\t" // set xmm0 to zero.
  		"ucomisd   %%xmm0,  %%xmm7       \n\t" // check if beta == 0.
  		"je      .DBETAZERO              \n\t" // if ZF = 1, jump to beta == 0 case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // check if aligned/column-stored
  		"andb     %%bl, %%bh             \n\t" // set ZF if bl & bh == 1.
  		"andb     %%bh, %%al             \n\t" // set ZF if bh & al == 1.
  		"jne     .DCOLSTORED             \n\t" // jump to column storage case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DGENSTORED:                    \n\t"
  		"                                \n\t"
  		"movlpd  (%%rcx),       %%xmm0   \n\t" // load c00 and c10,
  		"movhpd  (%%rcx,%%rsi), %%xmm0   \n\t"
  		"mulpd   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd   %%xmm8,  %%xmm0         \n\t" // add the gemm result,
  		"movlpd  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm0,  (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movlpd  (%%rdx),       %%xmm1   \n\t" // load c20 and c30,
  		"movhpd  (%%rdx,%%rsi), %%xmm1   \n\t"
  		"mulpd   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm12,  %%xmm1         \n\t" // add the gemm result,
  		"movlpd  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm1,  (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlpd  (%%rcx),       %%xmm0   \n\t" // load c01 and c11,
  		"movhpd  (%%rcx,%%rsi), %%xmm0   \n\t"
  		"mulpd   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd   %%xmm9,  %%xmm0         \n\t" // add the gemm result,
  		"movlpd  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm0,  (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movlpd  (%%rdx),       %%xmm1   \n\t" // load c21 and c31,
  		"movhpd  (%%rdx,%%rsi), %%xmm1   \n\t"
  		"mulpd   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm13,  %%xmm1         \n\t" // add the gemm result,
  		"movlpd  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm1,  (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlpd  (%%rcx),       %%xmm0   \n\t" // load c02 and c12,
  		"movhpd  (%%rcx,%%rsi), %%xmm0   \n\t"
  		"mulpd   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd  %%xmm10,  %%xmm0         \n\t" // add the gemm result,
  		"movlpd  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm0,  (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movlpd  (%%rdx),       %%xmm1   \n\t" // load c22 and c32,
  		"movhpd  (%%rdx,%%rsi), %%xmm1   \n\t"
  		"mulpd   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm14,  %%xmm1         \n\t" // add the gemm result,
  		"movlpd  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm1,  (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlpd  (%%rcx),       %%xmm0   \n\t" // load c03 and c13,
  		"movhpd  (%%rcx,%%rsi), %%xmm0   \n\t"
  		"mulpd   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd  %%xmm11,  %%xmm0         \n\t" // add the gemm result,
  		"movlpd  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm0,  (%%rcx,%%rsi)  \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movlpd  (%%rdx),       %%xmm1   \n\t" // load c23 and c33,
  		"movhpd  (%%rdx,%%rsi), %%xmm1   \n\t"
  		"mulpd   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm15,  %%xmm1         \n\t" // add the gemm result,
  		"movlpd  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm1,  (%%rdx,%%rsi)  \n\t"
  		"                                \n\t"
  		"jmp    .DDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DCOLSTORED:                    \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c00 and c10,
  		"mulpd   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd   %%xmm8,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c20 and c30,
  		"mulpd   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm12,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c01 and c11,
  		"mulpd   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd   %%xmm9,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c21 and c31,
  		"mulpd   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm13,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c02 and c12,
  		"mulpd   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd  %%xmm10,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c22 and c32,
  		"mulpd   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm14,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rcx),       %%xmm0   \n\t" // load c03 and c13,
  		"mulpd   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm0         \n\t" // scale by beta,
  		"addpd  %%xmm11,  %%xmm0         \n\t" // add the gemm result,
  		"movaps  %%xmm0,  (%%rcx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t"
  		"movaps  (%%rdx),       %%xmm1   \n\t" // load c23 and c33,
  		"mulpd   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"mulpd   %%xmm7,  %%xmm1         \n\t" // scale by beta,
  		"addpd  %%xmm15,  %%xmm1         \n\t" // add the gemm result,
  		"movaps  %%xmm1,  (%%rdx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"jmp    .DDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DBETAZERO:                     \n\t"
  		"                                \n\t" // check if aligned/column-stored
  		"andb     %%bl, %%bh             \n\t" // set ZF if bl & bh == 1.
  		"andb     %%bh, %%al             \n\t" // set ZF if bh & al == 1.
  		"jne     .DCOLSTORBZ             \n\t" // jump to column storage case
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DGENSTORBZ:                    \n\t"
  		"                                \n\t" // skip loading c00 and c10,
  		"mulpd   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"movlpd  %%xmm8,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm8,  (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c20 and c30,
  		"mulpd   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"movlpd  %%xmm12, (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm12, (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c01 and c11,
  		"mulpd   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"movlpd  %%xmm9,  (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm9,  (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c21 and c31,
  		"mulpd   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"movlpd  %%xmm13, (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm13, (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c02 and c12,
  		"mulpd   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"movlpd  %%xmm10, (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm10, (%%rcx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c22 and c32,
  		"mulpd   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"movlpd  %%xmm14, (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm14, (%%rdx,%%rsi)  \n\t"
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c03 and c13,
  		"mulpd   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"movlpd  %%xmm11, (%%rcx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm11, (%%rcx,%%rsi)  \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c23 and c33,
  		"mulpd   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"movlpd  %%xmm15, (%%rdx)        \n\t" // and store back to memory.
  		"movhpd  %%xmm15, (%%rdx,%%rsi)  \n\t"
  		"                                \n\t"
  		"jmp    .DDONE                   \n\t" // jump to end.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DCOLSTORBZ:                    \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c00 and c10,
  		"mulpd   %%xmm6,  %%xmm8         \n\t" // scale by alpha,
  		"movaps  %%xmm8,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c20 and c30,
  		"mulpd   %%xmm6,  %%xmm12        \n\t" // scale by alpha,
  		"movaps  %%xmm12, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c01 and c11,
  		"mulpd   %%xmm6,  %%xmm9         \n\t" // scale by alpha,
  		"movaps  %%xmm9,  (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c21 and c31,
  		"mulpd   %%xmm6,  %%xmm13        \n\t" // scale by alpha,
  		"movaps  %%xmm13, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c02 and c12,
  		"mulpd   %%xmm6,  %%xmm10        \n\t" // scale by alpha,
  		"movaps  %%xmm10, (%%rcx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rcx           \n\t"
  		"                                \n\t" // skip loading c22 and c32,
  		"mulpd   %%xmm6,  %%xmm14        \n\t" // scale by alpha,
  		"movaps  %%xmm14, (%%rdx)        \n\t" // and store back to memory.
  		"addq     %%rdi, %%rdx           \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t" // skip loading c03 and c13,
  		"mulpd   %%xmm6,  %%xmm11        \n\t" // scale by alpha,
  		"movaps  %%xmm11, (%%rcx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t" // skip loading c23 and c33,
  		"mulpd   %%xmm6,  %%xmm15        \n\t" // scale by alpha,
  		"movaps  %%xmm15, (%%rdx)        \n\t" // and store back to memory.
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		"                                \n\t"
  		".DDONE:                         \n\t"
  		"                                \n\t"
  
  		: // output operands (none)
  		: // input operands
  		  "m" (k_iter), // 0
  		  "m" (k_left), // 1
  		  "m" (a),      // 2
  		  "m" (b),      // 3
  		  "m" (alpha),  // 4
  		  "m" (beta),   // 5
  		  "m" (c),      // 6
  		  "m" (rs_c),   // 7
  		  "m" (cs_c),   // 8
  		  "m" (b_next), // 9
  		  "m" (a_next)  // 10
  		: // register clobber list
  		  "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "r8", "r9", "r10", "r11", "r12",
  		  "xmm0", "xmm1", "xmm2", "xmm3",
  		  "xmm4", "xmm5", "xmm6", "xmm7",
  		  "xmm8", "xmm9", "xmm10", "xmm11",
  		  "xmm12", "xmm13", "xmm14", "xmm15",
  		  "memory"
  	);
  }
  
  void bli_cgemm_opt_4x2(
                          dim_t              k,
                          scomplex* restrict alpha,
                          scomplex* restrict a,
                          scomplex* restrict b,
                          scomplex* restrict beta,
                          scomplex* restrict c, inc_t rs_c, inc_t cs_c,
                          auxinfo_t*         data
                        )
  {
  	/* Just call the reference implementation. */
  	BLIS_CGEMM_UKERNEL_REF( k,
  	                   alpha,
  	                   a,
  	                   b,
  	                   beta,
  	                   c, rs_c, cs_c,
  	                   data );
  }
  
  
  
  void bli_zgemm_opt_2x2(
                          dim_t              k,
                          dcomplex* restrict alpha,
                          dcomplex* restrict a,
                          dcomplex* restrict b,
                          dcomplex* restrict beta,
                          dcomplex* restrict c, inc_t rs_c, inc_t cs_c,
                          auxinfo_t*         data
                        )
  {
  	/* Just call the reference implementation. */
  	BLIS_ZGEMM_UKERNEL_REF( k,
  	                   alpha,
  	                   a,
  	                   b,
  	                   beta,
  	                   c, rs_c, cs_c,
  	                   data );
  }
  
  