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68 lines
1.4 KiB
68 lines
1.4 KiB
5 years ago
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#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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