mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 15:20:10 +00:00
5644ef5461
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.
50 lines
992 B
C
50 lines
992 B
C
/* Test case for x86-64 preserved registers in dynamic linker. */
|
|
|
|
#ifdef __AVX__
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <cpuid.h>
|
|
#include <immintrin.h>
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
extern __m256i audit_test (__m256i, __m256i, __m256i, __m256i,
|
|
__m256i, __m256i, __m256i, __m256i);
|
|
int
|
|
main (void)
|
|
{
|
|
/* Run AVX test only if AVX is supported. */
|
|
if (avx_enabled ())
|
|
{
|
|
__m256i ymm = _mm256_setzero_si256 ();
|
|
__m256i ret = audit_test (ymm, ymm, ymm, ymm, ymm, ymm, ymm, ymm);
|
|
|
|
ymm = _mm256_set1_epi32 (0x12349876);
|
|
if (memcmp (&ymm, &ret, sizeof (ret)))
|
|
abort ();
|
|
}
|
|
return 0;
|
|
}
|
|
#else
|
|
int
|
|
main (void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|