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67 lines
1.4 KiB
67 lines
1.4 KiB
#include<simdconfig.h> |
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#include<simdfuncs.h> |
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#include<stdint.h> |
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#ifdef _MSC_VER |
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#include<intrin.h> |
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int mmx_available(void) { |
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return 1; |
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} |
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/* Contrary to MSDN documentation, MMX intrinsics |
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* just plain don't work. |
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*/ |
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void increment_mmx(float arr[4]) { |
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arr[0]++; |
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arr[1]++; |
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arr[2]++; |
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arr[3]++; |
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} |
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#elif defined(__MINGW32__) |
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int mmx_available(void) { |
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return 1; |
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} |
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/* MinGW does not seem to ship with MMX or it is broken. |
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*/ |
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void increment_mmx(float arr[4]) { |
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arr[0]++; |
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arr[1]++; |
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arr[2]++; |
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arr[3]++; |
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} |
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#else |
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#include<mmintrin.h> |
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#include<cpuid.h> |
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#if defined(__APPLE__) |
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int mmx_available(void) { return 1; } |
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#else |
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int mmx_available(void) { |
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return __builtin_cpu_supports("mmx"); |
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} |
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#endif |
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void increment_mmx(float arr[4]) { |
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/* Super ugly but we know that values in arr are always small |
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* enough to fit in int16; |
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*/ |
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int i; |
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__m64 packed = _mm_set_pi16(arr[3], arr[2], arr[1], arr[0]); |
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__m64 incr = _mm_set1_pi16(1); |
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__m64 result = _mm_add_pi16(packed, incr); |
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/* Should be |
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* int64_t unpacker = _m_to_int64(result); |
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* but it does not exist on 32 bit platforms for some reason. |
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*/ |
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int64_t unpacker = (int64_t)(result); |
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_mm_empty(); |
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for(i=0; i<4; i++) { |
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/* This fails on GCC 8 when optimizations are enabled. |
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* Disable it. Patches welcome to fix this. |
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arr[i] = (float)(unpacker & ((1<<16)-1)); |
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unpacker >>= 16; |
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*/ |
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arr[i] += 1.0f; |
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} |
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} |
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#endif
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