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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.
43 lines
926 B
C
43 lines
926 B
C
/* Test case for x86-64 preserved registers in dynamic linker. */
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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 <emmintrin.h>
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extern __m128i audit_test (__m128i, __m128i, __m128i, __m128i,
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__m128i, __m128i, __m128i, __m128i);
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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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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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__m128i xmm = _mm_setzero_si128 ();
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__m128i ret = audit_test (xmm, xmm, xmm, xmm, xmm, xmm, xmm, xmm);
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xmm = _mm_set1_epi32 (0x98abcdef);
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if (memcmp (&xmm, &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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