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| author | Jessica Paquette <jpaquette@apple.com> | 2019-07-20 01:55:35 +0000 |
|---|---|---|
| committer | Jessica Paquette <jpaquette@apple.com> | 2019-07-20 01:55:35 +0000 |
| commit | 41affad967d48b8223dd8cfee254ee787b87a7e6 (patch) | |
| tree | 7817950d7af9ac443fa7ef8b1811709c76f6ed25 /clang/lib/Sema/SemaDeclAttr.cpp | |
| parent | 5204f7611f4ad6549921f9fa757823e77f39ce32 (diff) | |
| download | bcm5719-llvm-41affad967d48b8223dd8cfee254ee787b87a7e6.tar.gz bcm5719-llvm-41affad967d48b8223dd8cfee254ee787b87a7e6.zip | |
[GlobalISel][AArch64] Contract trivial same-size cross-bank copies into G_STOREs
Sometimes, you can end up with cross-bank copies between same-sized GPRs and
FPRs, which feed into G_STOREs. When these copies feed only into stores, they
aren't necessary; we can just store using the original register bank.
This provides some minor code size savings for some floating point SPEC
benchmarks. (Around 0.2% for 453.povray and 450.soplex)
This issue doesn't seem to show up due to regbankselect or anything similar. So,
this patch introduces an early select function, `contractCrossBankCopyIntoStore`
which performs the contraction when possible. The selector then continues
normally and selects the correct store opcode, eliminating needless copies
along the way.
Differential Revision: https://reviews.llvm.org/D65024
llvm-svn: 366625
Diffstat (limited to 'clang/lib/Sema/SemaDeclAttr.cpp')
0 files changed, 0 insertions, 0 deletions
