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| author | Zvi Rackover <zvi.rackover@intel.com> | 2016-12-06 19:35:20 +0000 |
|---|---|---|
| committer | Zvi Rackover <zvi.rackover@intel.com> | 2016-12-06 19:35:20 +0000 |
| commit | 8bc7e4da516c7a8cd3f1067fadb9c52ee297f6f4 (patch) | |
| tree | 3a87c9ef3bca7962b449ef089f9906acec19bcee /clang/test/Modules | |
| parent | e6c29d6d854cbbafc108cf32f9676157464f39fc (diff) | |
| download | bcm5719-llvm-8bc7e4da516c7a8cd3f1067fadb9c52ee297f6f4.tar.gz bcm5719-llvm-8bc7e4da516c7a8cd3f1067fadb9c52ee297f6f4.zip | |
[X86] Prefer reduced width multiplication over pmulld on Silvermont
Summary:
Prefer expansions such as: pmullw,pmulhw,unpacklwd,unpackhwd over pmulld.
On Silvermont [source: Optimization Reference Manual]:
PMULLD has a throughput of 1/11 [instruction/cycles].
PMULHUW/PMULHW/PMULLW have a throughput of 1/2 [instruction/cycles].
Fixes pr31202.
Analysis of this issue was done by Fahana Aleen.
Reviewers: wmi, delena, mkuper
Subscribers: RKSimon, llvm-commits
Differential Revision: https://reviews.llvm.org/D27203
llvm-svn: 288844
Diffstat (limited to 'clang/test/Modules')
0 files changed, 0 insertions, 0 deletions
