http://stackoverflow.i2p/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x
Here's the test code compiled on x64: int main() { double start = omp_get_wtime(); const float x[16]={1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.1,2.2,2.3,2.4,2.5,2.6}; const float z[16]={1.123,1.234,1.345,156.467,1.578,1.689,1.790,1.812,1.923,2.034,2.145,2.256,2.367,2.478,2.589,2.690}; float y[16]; for(int i=0;i < 16;i++) { y[i]=x[i]; } for(int j=0;j < 9000000;j++) { for(int i=0;i < 16;i++) { y[i]*=x[i]; y[i]/=z[i]; #ifdef FLOATING y[i]=y[i]+0.1f; ...