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| author | Sumanth Gundapaneni <sgundapa@codeaurora.org> | 2018-10-18 15:51:16 +0000 |
|---|---|---|
| committer | Sumanth Gundapaneni <sgundapa@codeaurora.org> | 2018-10-18 15:51:16 +0000 |
| commit | 62ac69d45c20e0cebc1464a02bf719e1ff2259c5 (patch) | |
| tree | de3149d0897c1a30782457e7138a88238e39d824 /clang/test/Driver/unknown-std.c | |
| parent | 3acfe400a2d9bbc00c8c5eb7ae0cc205209d4338 (diff) | |
| download | bcm5719-llvm-62ac69d45c20e0cebc1464a02bf719e1ff2259c5.tar.gz bcm5719-llvm-62ac69d45c20e0cebc1464a02bf719e1ff2259c5.zip | |
[Pipeliner] copyToPhi DAG Mutation to improve scheduling.
In a loop, create artificial dependences between the source of a
COPY/REG_SEQUENCE to the use in next iteration.
Eg:
SRC ----Data Dep--> COPY
COPY ---Anti Dep--> PHI (implies, to be used in next iteration)
PHI ----Data Dep--> USE
This patches creates
USE ----Artificial Dep---> SRC
This will effectively schedule the COPY late to eliminate additional copies.
Before this patch, the schedule can be
SRC, COPY, USE : The COPY is used in next iteration and it needs to be
preserved.
After this patch, the schedule can be
USE, SRC, COPY : The COPY is used in next iteration and the live interval is
reduced.
Differential Revision: https://reviews.llvm.org/D53303
llvm-svn: 344748
Diffstat (limited to 'clang/test/Driver/unknown-std.c')
0 files changed, 0 insertions, 0 deletions
