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43 lines
1021 B
C
43 lines
1021 B
C
#include <stdio.h>
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#include <pmmintrin.h>
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void calc_intrin(float result[], float matrix[], float vector[]);
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void calc_asm(float result[], float matrix[], float vector[]);
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int main() {
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int row, col;
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float vec[] = {1.0, 10.0, 100.0, 1000.0};
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float mat[] = {2.0, 0.0, 0.0, 0.0,
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0.0, 2.2, 0.0, 0.0,
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0.0, 0.0, 22.2, 0.0,
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0.0, 0.0, 0.0, 22.22};
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float result[4];
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calc_intrin(result, mat, vec);
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printf("%5.3f %5.3f %5.3f %5.3f\n", result[0], result[1], result[2], result[3]);
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calc_asm(result, mat, vec);
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printf("%5.3f %5.3f %5.3f %5.3f\n", result[0], result[1], result[2], result[3]);
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return 0;
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}
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void calc_intrin(float result[], float matrix[], float vector[])
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{
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int row;
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__m128 vec = _mm_loadu_ps(vector);
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for (row = 0;row < 4;row++) {
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__m128 rowvec = _mm_loadu_ps(&matrix[row * 4]);
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__m128 rowvec2 = _mm_mul_ps(vec, rowvec);
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__m128 rowvec3 = _mm_hadd_ps(rowvec2, rowvec2);
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__m128 rowvec4 = _mm_hadd_ps(rowvec3, rowvec3);
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_mm_store_ss(&result[row], rowvec4);
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}
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}
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