Created
December 29, 2016 04:54
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SSE test/sample code from Game Engine Architecture by Jason Gregory
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| #include <cstdio> | |
| #include <xmmintrin.h> | |
| __m128 addWithAssembly(const __m128 a, const __m128 b) | |
| { | |
| __asm addps xmm0, xmm1 | |
| } | |
| __m128 addWithIntrinsics(const __m128 a, const __m128 b) | |
| { | |
| return _mm_add_ps(a, b); | |
| } | |
| void testSSE() | |
| { | |
| __declspec(align(16)) float A[4]; | |
| __declspec(align(16)) float B[4] = { 8.0f, 6.0f, 4.0f, 2.0f }; | |
| __declspec(align(16)) float C[4]; | |
| __declspec(align(16)) float D[4]; | |
| __m128 a = _mm_set_ps(2.0f, 4.0f, 6.0f, 8.0f); | |
| __m128 b = _mm_load_ps(&B[0]); | |
| __m128 c = addWithAssembly(a, b); | |
| __m128 d = addWithIntrinsics(a, b); | |
| _mm_store_ps(&A[0], a); | |
| _mm_store_ps(&B[0], b); | |
| _mm_store_ps(&C[0], c); | |
| _mm_store_ps(&D[0], d); | |
| printf("a = %g %g %g %g\n", A[0], A[1], A[2], A[3]); | |
| printf("b = %g %g %g %g\n", B[0], B[1], B[2], B[3]); | |
| printf("c = %g %g %g %g\n", C[0], C[1], C[2], C[3]); | |
| printf("a = %g %g %g %g\n", D[0], D[1], D[2], D[3]); | |
| } | |
| int main() | |
| { | |
| testSSE(); | |
| return 0; | |
| } |
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