text: /*
   * Copyright 2005-2021 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the Apache License 2.0 (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdlib.h>
  #include <openssl/bn.h>
  #include "internal/cryptlib.h"
  #include "crypto/sparc_arch.h"
  #include "bn_local.h"    /* for definition of bn_mul_mont */
  
  int bn_mul_mont(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
                  const BN_ULONG *np, const BN_ULONG *n0, int num)
  {
      int bn_mul_mont_vis3(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
                           const BN_ULONG *np, const BN_ULONG *n0, int num);
      int bn_mul_mont_fpu(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
                          const BN_ULONG *np, const BN_ULONG *n0, int num);
      int bn_mul_mont_int(BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,
                          const BN_ULONG *np, const BN_ULONG *n0, int num);
  
      if (!(num & 1) && num >= 6) {
          if ((num & 15) == 0 && num <= 64 &&
              (OPENSSL_sparcv9cap_P[1] & (CFR_MONTMUL | CFR_MONTSQR)) ==
              (CFR_MONTMUL | CFR_MONTSQR)) {
              typedef int (*bn_mul_mont_f) (BN_ULONG *rp, const BN_ULONG *ap,
                                            const BN_ULONG *bp,
                                            const BN_ULONG *np,
                                            const BN_ULONG *n0);
              int bn_mul_mont_t4_8(BN_ULONG *rp, const BN_ULONG *ap,
                                   const BN_ULONG *bp, const BN_ULONG *np,
                                   const BN_ULONG *n0);
              int bn_mul_mont_t4_16(BN_ULONG *rp, const BN_ULONG *ap,
                                    const BN_ULONG *bp, const BN_ULONG *np,
                                    const BN_ULONG *n0);
              int bn_mul_mont_t4_24(BN_ULONG *rp, const BN_ULONG *ap,
                                    const BN_ULONG *bp, const BN_ULONG *np,
                                    const BN_ULONG *n0);
              int bn_mul_mont_t4_32(BN_ULONG *rp, const BN_ULONG *ap,
                                    const BN_ULONG *bp, const BN_ULONG *np,
                                    const BN_ULONG *n0);
              static const bn_mul_mont_f funcs[4] = {
                  bn_mul_mont_t4_8, bn_mul_mont_t4_16,
                  bn_mul_mont_t4_24, bn_mul_mont_t4_32
              };
              bn_mul_mont_f worker = funcs[num / 16 - 1];
  
              if ((*worker) (rp, ap, bp, np, n0))
                  return 1;
              /* retry once and fall back */
              if ((*worker) (rp, ap, bp, np, n0))
                  return 1;
              return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
          }
          if ((OPENSSL_sparcv9cap_P[0] & SPARCV9_VIS3))
              return bn_mul_mont_vis3(rp, ap, bp, np, n0, num);
          else if (num >= 8 &&
                   /*
                    * bn_mul_mont_fpu doesn't use FMADD, we just use the
                    * flag to detect when FPU path is preferable in cases
                    * when current heuristics is unreliable. [it works
                    * out because FMADD-capable processors where FPU
                    * code path is undesirable are also VIS3-capable and
                    * VIS3 code path takes precedence.]
                    */
                   ( (OPENSSL_sparcv9cap_P[0] & SPARCV9_FMADD) ||
                     (OPENSSL_sparcv9cap_P[0] &
                      (SPARCV9_PREFER_FPU | SPARCV9_VIS1)) ==
                     (SPARCV9_PREFER_FPU | SPARCV9_VIS1) ))
              return bn_mul_mont_fpu(rp, ap, bp, np, n0, num);
      }
      return bn_mul_mont_int(rp, ap, bp, np, n0, num);
  }
  