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 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"
  
  #define FUNCPTR_T trmm_fp
  
  typedef void (*FUNCPTR_T)( obj_t*  a,
                             obj_t*  b,
                             obj_t*  c,
                             trmm_t* cntl );
  
  static FUNCPTR_T vars[2][2][4][3] =
  {
  	// left
  	{
  		// lower
  		{
  		    // unblocked            optimized unblocked    blocked
  		    { NULL,                 NULL,                  bli_trmm_blk_var1   },
  		    { NULL,                 bli_trmm_ll_ker_var2,  bli_trmm_blk_var2b  },
  		    { NULL,                 NULL,                  bli_trmm_blk_var3b  },
  		    { NULL,                 NULL,                  NULL                },
  		},
  		// upper
  		{
  		    // unblocked            optimized unblocked    blocked
  		    { NULL,                 NULL,                  bli_trmm_blk_var1   },
  		    { NULL,                 bli_trmm_lu_ker_var2,  bli_trmm_blk_var2f  },
  		    { NULL,                 NULL,                  bli_trmm_blk_var3f  },
  		    { NULL,                 NULL,                  NULL                },
  		}
  	},
  	// right
  	{
  		// lower
  		{
  		    // unblocked            optimized unblocked    blocked
  		    { NULL,                 NULL,                  bli_trmm_blk_var1   },
  		    { NULL,                 bli_trmm_rl_ker_var2,  bli_trmm_blk_var2f  },
  		    { NULL,                 NULL,                  bli_trmm_blk_var3f  },
  		    { NULL,                 NULL,                  NULL                },
  		},
  		// upper
  		{
  		    // unblocked            optimized unblocked    blocked
  		    { NULL,                 NULL,                  bli_trmm_blk_var1   },
  		    { NULL,                 bli_trmm_ru_ker_var2,  bli_trmm_blk_var2b  },
  		    { NULL,                 NULL,                  bli_trmm_blk_var3b  },
  		    { NULL,                 NULL,                  NULL                },
  		}
  	}
  };
  
  void bli_trmm_int( obj_t*  alpha,
                     obj_t*  a,
                     obj_t*  b,
                     obj_t*  beta,
                     obj_t*  c,
                     trmm_t* cntl )
  {
  	obj_t     a_local;
  	obj_t     b_local;
  	obj_t     c_local;
  	bool_t    side, uplo;
  	varnum_t  n;
  	impl_t    i;
  	FUNCPTR_T f;
  
  	// Check parameters.
  	if ( bli_error_checking_is_enabled() )
  		bli_trmm_int_check( alpha, a, b, beta, c, cntl );
  
  	// If C has a zero dimension, return early.
  	if ( bli_obj_has_zero_dim( *c ) ) return;
  
  	// If A or B has a zero dimension, scale C by beta and return early.
  	if ( bli_obj_has_zero_dim( *a ) ||
  	     bli_obj_has_zero_dim( *b ) )
  	{
  		bli_scalm( beta, c );
  		return;
  	}
  
  	// Alias A and B in case we need to update attached scalars.
  	bli_obj_alias_to( *a, a_local );
  	bli_obj_alias_to( *b, b_local );
  
  	// Alias C in case we need to induce a transposition.
  	bli_obj_alias_to( *c, c_local );
  
  	// If we are about to call a leaf-level implementation, and matrix C
  	// still needs a transposition, then we must induce one by swapping the
  	// strides and dimensions. Note that this transposition would normally
  	// be handled explicitly in the packing of C, but if C is not being
  	// packed, this is our last chance to handle the transposition.
  	if ( cntl_is_leaf( cntl ) && bli_obj_has_trans( *c ) )
  	{
  		bli_obj_induce_trans( c_local );
  		bli_obj_set_onlytrans( BLIS_NO_TRANSPOSE, c_local );
  	}
  
  	// If alpha is non-unit, typecast and apply it to the scalar attached
  	// to B.
  	if ( !bli_obj_equals( alpha, &BLIS_ONE ) )
  	{
  		bli_obj_scalar_apply_scalar( alpha, &b_local );
  	}
  
  	// If beta is non-unit, typecast and apply it to the scalar attached
  	// to C.
  	if ( !bli_obj_equals( beta, &BLIS_ONE ) )
  	{
  		bli_obj_scalar_apply_scalar( beta, &c_local );
  	}
  
  	// Set two bools: one based on the implied side parameter (the structure
  	// of the root object) and one based on the uplo field of the triangular
  	// matrix's root object (whether that is matrix A or matrix B).
  	if ( bli_obj_root_is_triangular( *a ) )
  	{
  		side = 0;
  		if ( bli_obj_root_is_lower( *a ) ) uplo = 0;
  		else                               uplo = 1;
  	}
  	else // if ( bli_obj_root_is_triangular( *b ) )
  	{
  		side = 1;
  		// Set a bool based on the uplo field of A's root object.
  		if ( bli_obj_root_is_lower( *b ) ) uplo = 0;
  		else                               uplo = 1;
  	}
  
  	// Extract the variant number and implementation type.
  	n = cntl_var_num( cntl );
  	i = cntl_impl_type( cntl );
  
  	// Index into the variant array to extract the correct function pointer.
  	f = vars[side][uplo][n][i];
  
  	// Invoke the variant.
  	f( &a_local,
  	   &b_local,
  	   &c_local,
  	   cntl );
  }
  
  