In terms of the "not so obvious" performance benefit gained when using an Intel compiler on an Intel platform, are there any suitable numerical benchmarks that can be used for a comparison of different compilers? My comparison(using numerical algorithms)of Intel's Composer against other popular compilers shows that Intel Composer out performs the others by nearly 50% when using nothing more than /O2. No SSE, etc used.
I have not yet started profiling the code on both platforms as to why this should be, but am suspicious that the improvement when using Intel Composer is so large as this is too good to be true.I have some detail off the web that shows similar results.
How does the Intel compiler build code that is so much quicker than others ?