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AVX 512 detection: workaround for older GCC

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This commit is contained in:
Maksim Shabunin 2019-06-06 16:59:17 +03:00
parent cdee3d33b4
commit 65919ed839
1 changed files with 15 additions and 0 deletions
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15
cmake/checks/cpu_avx512skx.cpp
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@ -1,5 +1,17 @@
#if defined __AVX512__ || defined __AVX512F__
#include <immintrin.h>
// Workaround for problem with GCC 5-6 in -O0 mode
struct v_uint32x16
{
__m512i val;
explicit v_uint32x16(__m512i v) : val(v) {}
};
inline v_uint32x16 operator << (const v_uint32x16& a, int imm)
{
return v_uint32x16(_mm512_slli_epi32(a.val, imm));
}
void test()
{
__m512i zmm = _mm512_setzero_si512();
@ -7,10 +19,13 @@ void test()
__m256i b = _mm256_abs_epi64(a); // VL
__m512i c = _mm512_abs_epi8(zmm); // BW
__m512i d = _mm512_broadcast_i32x8(b); // DQ
v_uint32x16 e(d); e = e << 10;
__m512i f = _mm512_packus_epi32(d,d);
#if defined __GNUC__ && defined __x86_64__
asm volatile ("" : : : "zmm16", "zmm17", "zmm18", "zmm19");
#endif
}
#else
#error "AVX512-SKX is not supported"
#endif