https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68600
Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |jvdelisle at gcc dot gnu.org
--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 36869
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36869&action=edit
Thomas program with a modified dgemm.
The dgemm in this example is a stripped out version of an "optimized for cache"
version from netlib.org. I stripped out a lot of the unused code.
Results show better performance for larger arrays. Maybe we could model the
library routines after this and invoke for larger arrays.
Size Loops Matmul dgemm Matmul Matmul
fixed explicit assumed variable
explicit
==============================================================================
2 200000 1.752 0.042 0.124 0.295
4 200000 2.172 0.314 0.434 0.704
8 200000 2.293 1.071 0.721 1.127
16 200000 2.826 1.533 0.972 1.468
32 200000 2.707 1.666 1.184 2.154
64 30757 2.726 1.853 1.192 2.299
128 3829 2.641 1.965 1.379 2.542
256 477 2.661 2.001 1.384 2.594
512 59 1.740 2.011 1.147 1.746
1024 7 1.344 2.024 1.070 1.355
2048 1 1.305 2.026 1.088 1.312
