diff options
| author | Andy Polyakov <appro@openssl.org> | 2017-01-27 19:03:37 +0100 |
|---|---|---|
| committer | Andy Polyakov <appro@openssl.org> | 2017-02-03 12:21:50 +0100 |
| commit | 66bee01c822c5dd26679cad076c52b3d81199668 (patch) | |
| tree | 2f4395b9f20bb7cbda2e8e241af9cfe896882f9c /crypto/x86_64cpuid.pl | |
| parent | 02cba628daa7fea959c561531a8a984756bdf41c (diff) | |
| download | openssl-new-66bee01c822c5dd26679cad076c52b3d81199668.tar.gz | |
crypto/x86_64cpuid.pl: detect if kernel preserves %zmm registers.
Reviewed-by: Rich Salz <rsalz@openssl.org>
Diffstat (limited to 'crypto/x86_64cpuid.pl')
| -rw-r--r-- | crypto/x86_64cpuid.pl | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/crypto/x86_64cpuid.pl b/crypto/x86_64cpuid.pl index 6cb152148b..3082253aea 100644 --- a/crypto/x86_64cpuid.pl +++ b/crypto/x86_64cpuid.pl @@ -175,13 +175,21 @@ OPENSSL_ia32_cpuid: jnc .Lclear_avx xor %ecx,%ecx # XCR0 .byte 0x0f,0x01,0xd0 # xgetbv + and \$0xe6,%eax # isolate XMM, YMM and ZMM state support + cmp \$0xe6,%eax + je .Ldone + andl \$0xfffeffff,8(%rdi) # clear AVX512F, ~(1<<16) + # note that we don't touch other AVX512 + # extensions, because they can be used + # with YMM (without opmasking though) and \$6,%eax # isolate XMM and YMM state support cmp \$6,%eax je .Ldone .Lclear_avx: mov \$0xefffe7ff,%eax # ~(1<<28|1<<12|1<<11) and %eax,%r9d # clear AVX, FMA and AMD XOP bits - andl \$0xffffffdf,8(%rdi) # cleax AVX2, ~(1<<5) + mov \$0x3fdeffdf,%eax # ~(1<<31|1<<30|1<<21|1<<16|1<<5) + and %eax,8(%rdi) # cleax AVX2 and AVX512* bits .Ldone: shl \$32,%r9 mov %r10d,%eax |