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move check for AD*X to rsaz-avx2.pl.

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This ensures high performance is situations when assembler supports
AVX2, but not AD*X.

(Imported from upstream's 82a9dafe32e1e39b5adff18f9061e43d8df3d3c5)

Change-Id: Ie67f49a1c5467807139b6a8a0d4e62162d8a974f
This commit is contained in:
Adam Langley 2014-07-24 16:05:32 -07:00
parent 05b7377065
commit 25ba90e34a
2 changed files with 13 additions and 2 deletions
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12
crypto/bn/asm/rsaz-avx2.pl
View File

@ -78,16 +78,19 @@ die "can't locate x86_64-xlate.pl";
if (`$ENV{CC} -Wa,-v -c -o /dev/null -x assembler /dev/null 2>&1`
=~ /GNU assembler version ([2-9]\.[0-9]+)/) {
$avx = ($1>=2.19) + ($1>=2.22);
$addx = ($1>=2.23);
}
if (!$avx && $win64 && ($flavour =~ /nasm/ || $ENV{ASM} =~ /nasm/) &&
`nasm -v 2>&1` =~ /NASM version ([2-9]\.[0-9]+)/) {
$avx = ($1>=2.09) + ($1>=2.10);
$addx = ($1>=2.10);
}
if (!$avx && $win64 && ($flavour =~ /masm/ || $ENV{ASM} =~ /ml64/) &&
`ml64 2>&1` =~ /Version ([0-9]+)\./) {
$avx = ($1>=10) + ($1>=11);
$addx = ($1>=11);
}
open OUT,"| $^X $xlate $flavour $output";
@ -1673,6 +1676,15 @@ $code.=<<___;
.align 32
rsaz_avx2_eligible:
mov OPENSSL_ia32cap_P+8(%rip),%eax
___
$code.=<<___ if ($addx);
mov \$`1<<8|1<<19`,%ecx
mov \$0,%edx
and %eax,%ecx
cmp \$`1<<8|1<<19`,%ecx # check for BMI2+AD*X
cmove %edx,%eax
___
$code.=<<___;
and \$`1<<5`,%eax
shr \$5,%eax
ret

3
crypto/bn/exponentiation.c
View File

@ -890,8 +890,7 @@ int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
/* If the size of the operands allow it, perform the optimized
* RSAZ exponentiation. For further information see
* crypto/bn/rsaz_exp.c and accompanying assembly modules. */
if (((OPENSSL_ia32cap_P[2] & 0x80100) != 0x80100) /* check for MULX/AD*X */
&& (16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024) &&
if ((16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024) &&
rsaz_avx2_eligible()) {
if (NULL == bn_wexpand(rr, 16))
goto err;