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bn/bn_exp.c: prefer MULX/AD*X over AVX2.

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This commit is contained in:
Andy Polyakov 2013-10-09 11:08:52 +02:00
parent 2d752737c5
commit 37de2b5c1e
1 changed files with 2 additions and 1 deletions
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3
crypto/bn/bn_exp.c
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@ -691,7 +691,8 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
* RSAZ exponentiation. For further information see
* crypto/bn/rsaz_exp.c and accompanying assembly modules.
*/
if ((16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024)
if (((OPENSSL_ia32cap_P[2]&0x80100) != 0x80100) /* check for MULX/AD*X */
&& (16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024)
&& rsaz_avx2_eligible())
{
if (NULL == bn_wexpand(rr, 16)) goto err;