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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 /elf/tst-audit6.c | |
| parent | 6986b98a18490e76b16911d1c6b1ba013598d40d (diff) | |
| download | glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.tar glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.tar.gz glibc-5644ef5461b5d3ff266206d8ee70d4b575ea6658.tar.bz2 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 'elf/tst-audit6.c')
| -rw-r--r-- | elf/tst-audit6.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/elf/tst-audit6.c b/elf/tst-audit6.c index 1f6dcb16e9..64209a152e 100644 --- a/elf/tst-audit6.c +++ b/elf/tst-audit6.c @@ -8,14 +8,28 @@ extern __m128i audit_test (__m128i, __m128i, __m128i, __m128i, __m128i, __m128i, __m128i, __m128i); -int -main (void) + +static int +avx_enabled (void) { unsigned int eax, ebx, ecx, edx; + if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0 + || (ecx & (bit_AVX | bit_OSXSAVE)) != (bit_AVX | bit_OSXSAVE)) + return 0; + + /* Check the OS has AVX and SSE saving enabled. */ + asm ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0)); + + return (eax & 6) == 6; +} + + +int +main (void) +{ /* Run AVX test only if AVX is supported. */ - if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) - && (ecx & bit_AVX)) + if (avx_enabled ()) { __m128i xmm = _mm_setzero_si128 (); __m128i ret = audit_test (xmm, xmm, xmm, xmm, xmm, xmm, xmm, xmm); |