cs205-lecture-examples

Example codes used during Harvard CS205 lectures
git clone https://git.0xfab.ch/cs205-lecture-examples.git
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transpose.c (371B)

      1 #include <x86intrin.h>
      2 void transpose4(float A[4][4])
      3 {
      4     __m128 a = _mm_load_ps(&A[0][0]);
      5     __m128 b = _mm_load_ps(&A[1][0]);
      6     __m128 c = _mm_load_ps(&A[2][0]);
      7     __m128 d = _mm_load_ps(&A[3][0]);
      8 
      9     _MM_TRANSPOSE4_PS(a, b, c, d);
     10 
     11     _mm_store_ps(&A[0][0], a);
     12     _mm_store_ps(&A[1][0], b);
     13     _mm_store_ps(&A[2][0], c);
     14     _mm_store_ps(&A[3][0], d);
     15 }