Anna Thomas 9f1be02fa3 [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

2017-09-12 16:32:45 +00:00

..

CMakeLists.txt

[LV] Fix PR34248 - recommit D32871 after revert r311304

2017-08-27 12:55:46 +00:00

LLVMBuild.txt

…

LoadStoreVectorizer.cpp

[KnownBits] Add bit counting methods to KnownBits struct and use them where possible

2017-05-12 17:20:30 +00:00

LoopVectorize.cpp

[LV] Clamp the VF to the trip count

2017-09-12 16:32:45 +00:00

SLPVectorizer.cpp

[SLP] Fix for PHINode during horizontal reduction scanning, NFC.

2017-09-12 15:13:50 +00:00

Vectorize.cpp

Remove the BBVectorize pass.

2017-06-30 07:09:08 +00:00

VPlan.cpp

[LV] Fix PR34248 - recommit D32871 after revert r311304

2017-08-27 12:55:46 +00:00

VPlan.h

[LV] Fix PR34248 - recommit D32871 after revert r311304

2017-08-27 12:55:46 +00:00