Re:Optimizing matrix multiplication in C
by Const-me on Tuesday August 30, 2016 @03:08AM
(#12388081)
OK, did that. Results for GCC are very close to the OP’s results for Xeon.
GCC indeed did better optimization of Eigen than MSVC. Specifically, about 25% better. I think that might be because authors of Eigen have very intimate knowledge on GCC’s optimizer, and somehow specifically optimized their code for GCC compiler.
However, for the rest of the test cases, MSVC performed much better. For example, for Transposed algorithm, MSVC result is 3.5 times faster - huge difference.
GCC indeed did better optimization of Eigen than MSVC. Specifically, about 25% better. I think that might be because authors of Eigen have very intimate knowledge on GCC’s optimizer, and somehow specifically optimized their code for GCC compiler.
However, for the rest of the test cases, MSVC performed much better. For example, for Transposed algorithm, MSVC result is 3.5 times faster - huge difference.