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| author | Ulrich Drepper <drepper@gmail.com> | 2011-07-20 21:21:03 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-07-20 21:21:03 -0400 |
| commit | 5644ef5461b5d3ff266206d8ee70d4b575ea6658 (patch) | |
| tree | 193bd218ab8cf9681ee55ff3526a58c4ae0847d1 /sysdeps | |
| parent | 6986b98a18490e76b16911d1c6b1ba013598d40d (diff) | |
| download | glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.tar.gz glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.tar.xz glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.zip | |
Fix check for AVX enablement
The AVX bit is set if the CPU supports AVX. But this doesn't mean the kernel does. Add checks according to Intel's documentation.
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/x86_64/dl-trampoline.S | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/sysdeps/x86_64/dl-trampoline.S b/sysdeps/x86_64/dl-trampoline.S index 5564a11af2..1b97929aaa 100644 --- a/sysdeps/x86_64/dl-trampoline.S +++ b/sysdeps/x86_64/dl-trampoline.S @@ -1,5 +1,5 @@ /* PLT trampolines. x86-64 version. - Copyright (C) 2004, 2005, 2007, 2009 Free Software Foundation, Inc. + Copyright (C) 2004, 2005, 2007, 2009, 2011 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -139,10 +139,17 @@ L(have_avx): movl $1, %eax cpuid movq %r11,%rbx # Restore rbx - movl $1, %eax - testl $(1 << 28), %ecx - jne 2f - negl %eax + xorl %eax, %eax + // AVX and XSAVE supported? + testl $((1 << 28) | (1 << 27)), %ecx + je 2f + xorl %ecx, %ecx + // Get XFEATURE_ENABLED_MASK + xgetbv + andl $0x6, %eax + cmpl $0x6, %eax + // Nonzero if SSE and AVX state saving is enabled. + sete %al 2: movl %eax, L(have_avx)(%rip) cmpl $0, %eax |