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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. */
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#ifdef __AVX__
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#include <stdlib.h>
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#include <string.h>
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#include <cpuid.h>
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#include <immintrin.h>
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static int
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avx_enabled (void)
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{
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unsigned int eax, ebx, ecx, edx;
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if (__get_cpuid (1, &eax, &ebx, &ecx, &edx) == 0
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|| (ecx & (bit_AVX | bit_OSXSAVE)) != (bit_AVX | bit_OSXSAVE))
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return 0;
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/* Check the OS has AVX and SSE saving enabled. */
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asm ("xgetbv" : "=a" (eax), "=d" (edx) : "c" (0));
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return (eax & 6) == 6;
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}
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extern __m256i audit_test (__m256i, __m256i, __m256i, __m256i,
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__m256i, __m256i, __m256i, __m256i);
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int
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main (void)
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{
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/* Run AVX test only if AVX is supported. */
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if (avx_enabled ())
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{
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__m256i ymm = _mm256_setzero_si256 ();
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__m256i ret = audit_test (ymm, ymm, ymm, ymm, ymm, ymm, ymm, ymm);
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ymm = _mm256_set1_epi32 (0x12349876);
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if (memcmp (&ymm, &ret, sizeof (ret)))
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abort ();
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}
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return 0;
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}
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#else
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int
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main (void)
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{
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return 0;
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}
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#endif
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