diff options
-rw-r--r-- | crypto/ec/curve448/arch_64/f_impl.c | 140 |
1 files changed, 16 insertions, 124 deletions
diff --git a/crypto/ec/curve448/arch_64/f_impl.c b/crypto/ec/curve448/arch_64/f_impl.c index b615bab206..955f723419 100644 --- a/crypto/ec/curve448/arch_64/f_impl.c +++ b/crypto/ec/curve448/arch_64/f_impl.c @@ -19,7 +19,7 @@ void gf_mul(gf_s * RESTRICT cs, const gf as, const gf bs) uint128_t accum0 = 0, accum1 = 0, accum2; uint64_t mask = (1ULL << 56) - 1; uint64_t aa[4], bb[4], bbb[4]; - unsigned int i; + unsigned int i, j; for (i = 0; i < 4; i++) { aa[i] = a[i] + a[i + 4]; @@ -27,137 +27,29 @@ void gf_mul(gf_s * RESTRICT cs, const gf as, const gf bs) bbb[i] = bb[i] + b[i + 4]; } - int I_HATE_UNROLLED_LOOPS = 0; - - if (I_HATE_UNROLLED_LOOPS) { - /* - * The compiler probably won't unroll this, so it's like 80% slower. - */ - for (i = 0; i < 4; i++) { - accum2 = 0; - - unsigned int j; - for (j = 0; j <= i; j++) { - accum2 += widemul(a[j], b[i - j]); - accum1 += widemul(aa[j], bb[i - j]); - accum0 += widemul(a[j + 4], b[i - j + 4]); - } - for (; j < 4; j++) { - accum2 += widemul(a[j], b[i - j + 8]); - accum1 += widemul(aa[j], bbb[i - j + 4]); - accum0 += widemul(a[j + 4], bb[i - j + 4]); - } - - accum1 -= accum2; - accum0 += accum2; - - c[i] = ((uint64_t)(accum0)) & mask; - c[i + 4] = ((uint64_t)(accum1)) & mask; - - accum0 >>= 56; - accum1 >>= 56; - } - } else { - accum2 = widemul(a[0], b[0]); - accum1 += widemul(aa[0], bb[0]); - accum0 += widemul(a[4], b[4]); - - accum2 += widemul(a[1], b[7]); - accum1 += widemul(aa[1], bbb[3]); - accum0 += widemul(a[5], bb[3]); - - accum2 += widemul(a[2], b[6]); - accum1 += widemul(aa[2], bbb[2]); - accum0 += widemul(a[6], bb[2]); - - accum2 += widemul(a[3], b[5]); - accum1 += widemul(aa[3], bbb[1]); - accum0 += widemul(a[7], bb[1]); - - accum1 -= accum2; - accum0 += accum2; - - c[0] = ((uint64_t)(accum0)) & mask; - c[4] = ((uint64_t)(accum1)) & mask; - - accum0 >>= 56; - accum1 >>= 56; - - accum2 = widemul(a[0], b[1]); - accum1 += widemul(aa[0], bb[1]); - accum0 += widemul(a[4], b[5]); - - accum2 += widemul(a[1], b[0]); - accum1 += widemul(aa[1], bb[0]); - accum0 += widemul(a[5], b[4]); - - accum2 += widemul(a[2], b[7]); - accum1 += widemul(aa[2], bbb[3]); - accum0 += widemul(a[6], bb[3]); - - accum2 += widemul(a[3], b[6]); - accum1 += widemul(aa[3], bbb[2]); - accum0 += widemul(a[7], bb[2]); - - accum1 -= accum2; - accum0 += accum2; - - c[1] = ((uint64_t)(accum0)) & mask; - c[5] = ((uint64_t)(accum1)) & mask; - - accum0 >>= 56; - accum1 >>= 56; - - accum2 = widemul(a[0], b[2]); - accum1 += widemul(aa[0], bb[2]); - accum0 += widemul(a[4], b[6]); - - accum2 += widemul(a[1], b[1]); - accum1 += widemul(aa[1], bb[1]); - accum0 += widemul(a[5], b[5]); - - accum2 += widemul(a[2], b[0]); - accum1 += widemul(aa[2], bb[0]); - accum0 += widemul(a[6], b[4]); - - accum2 += widemul(a[3], b[7]); - accum1 += widemul(aa[3], bbb[3]); - accum0 += widemul(a[7], bb[3]); - - accum1 -= accum2; - accum0 += accum2; - - c[2] = ((uint64_t)(accum0)) & mask; - c[6] = ((uint64_t)(accum1)) & mask; - - accum0 >>= 56; - accum1 >>= 56; - - accum2 = widemul(a[0], b[3]); - accum1 += widemul(aa[0], bb[3]); - accum0 += widemul(a[4], b[7]); - - accum2 += widemul(a[1], b[2]); - accum1 += widemul(aa[1], bb[2]); - accum0 += widemul(a[5], b[6]); - - accum2 += widemul(a[2], b[1]); - accum1 += widemul(aa[2], bb[1]); - accum0 += widemul(a[6], b[5]); + for (i = 0; i < 4; i++) { + accum2 = 0; - accum2 += widemul(a[3], b[0]); - accum1 += widemul(aa[3], bb[0]); - accum0 += widemul(a[7], b[4]); + for (j = 0; j <= i; j++) { + accum2 += widemul(a[j], b[i - j]); + accum1 += widemul(aa[j], bb[i - j]); + accum0 += widemul(a[j + 4], b[i - j + 4]); + } + for (; j < 4; j++) { + accum2 += widemul(a[j], b[i - j + 8]); + accum1 += widemul(aa[j], bbb[i - j + 4]); + accum0 += widemul(a[j + 4], bb[i - j + 4]); + } accum1 -= accum2; accum0 += accum2; - c[3] = ((uint64_t)(accum0)) & mask; - c[7] = ((uint64_t)(accum1)) & mask; + c[i] = ((uint64_t)(accum0)) & mask; + c[i + 4] = ((uint64_t)(accum1)) & mask; accum0 >>= 56; accum1 >>= 56; - } /* !I_HATE_UNROLLED_LOOPS */ + } accum0 += accum1; accum0 += c[4]; |