diff options
| author | Anna Thomas <anna@azul.com> | 2017-09-12 16:32:45 +0000 |
|---|---|---|
| committer | Anna Thomas <anna@azul.com> | 2017-09-12 16:32:45 +0000 |
| commit | 9f1be02fa333f7d9d4a6b3021181d15df847c03c (patch) | |
| tree | 85fe6d52eeb65d5a691e69796489555e1167fa5d /clang/lib/Frontend/CompilerInstance.cpp | |
| parent | a54ed0a4074d255665b3ffcc6602244800e13f2c (diff) | |
| download | bcm5719-llvm-9f1be02fa333f7d9d4a6b3021181d15df847c03c.tar.gz bcm5719-llvm-9f1be02fa333f7d9d4a6b3021181d15df847c03c.zip | |
[LV] Clamp the VF to the trip count
Summary:
When the MaxVectorSize > ConstantTripCount, we should just clamp the
vectorization factor to be the ConstantTripCount.
This vectorizes loops where the TinyTripCountThreshold >= TripCount < MaxVF.
Earlier we were finding the maximum vector width, which could be greater than
the trip count itself. The Loop vectorizer does all the work for generating a
vectorizable loop, but in the end we would always choose the scalar loop (since
the VF > trip count). This allows us to choose the VF keeping in mind the trip
count if available.
This is a fix on top of rL312472.
Reviewers: Ayal, zvi, hfinkel, dneilson
Reviewed by: Ayal
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D37702
llvm-svn: 313046
Diffstat (limited to 'clang/lib/Frontend/CompilerInstance.cpp')
0 files changed, 0 insertions, 0 deletions
