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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2020-12-23 22:26:40 +0300 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2020-12-23 22:28:10 +0300 |
| commit | 2b61e7c68cda16159b186fea1a1b1252b94b7e16 (patch) | |
| tree | e506b768f50625caafc5267e77d0f44e7d2c91c0 /clang/lib/Basic/Module.cpp | |
| parent | a0ddc61c5b95be2585b6b4981cf8634d7a00e4a6 (diff) | |
| download | llvm-2b61e7c68cda16159b186fea1a1b1252b94b7e16.zip llvm-2b61e7c68cda16159b186fea1a1b1252b94b7e16.tar.gz llvm-2b61e7c68cda16159b186fea1a1b1252b94b7e16.tar.bz2 | |
[LoopIdiom] 'left-shift until bittest' idiom: support rewriting loop as countable, allow extra cruft
The current state of the transform is still not enough to support
my motivational pattern, because it has one more "induction variable".
I have delayed posting this patch, because originally even just rewriting
the loop as countable wasn't enough to nicely transform my motivational pattern,
because i expected that extra IV to be rewritten afterwards,
but it wasn't happening until i fixed that in D91800.
So, this patch allows the 'left-shift until bittest' loop idiom
as long as the inserted ops are cheap,
and lifts any and all extra use checks on the instructions.
Reviewed By: craig.topper
Differential Revision: https://reviews.llvm.org/D92754
Diffstat (limited to 'clang/lib/Basic/Module.cpp')
0 files changed, 0 insertions, 0 deletions