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Hal Finkel 3f92210a79 [LV] Extend InstWidening with CM_Widen_Recursive

Changes to the original scalar loop during LV code gen cause the return value
of Legal->isConsecutivePtr() to be inconsistent with the return value during
legal/cost phases (further analysis and information of the bug is in D39346).
This patch is an alternative fix to PR34965 following the CM_Widen approach
proposed by Ayal and Gil in D39346. It extends InstWidening enum with
CM_Widen_Reverse to properly record the widening decision for consecutive
reverse memory accesses and, consequently, get rid of the
Legal->isConsetuviePtr() call in LV code gen. I think this is a simpler/cleaner
solution to PR34965 than the one in D39346.

Fixes PR34965.

Patch by Diego Caballero, thanks!

Differential Revision: https://reviews.llvm.org/D40742

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@320913 91177308-0d34-0410-b5e6-96231b3b80d8

2017-12-16 02:55:24 +00:00

CMakeLists.txt

[LV] Fix PR34248 - recommit D32871 after revert r311304

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

LLVMBuild.txt

Update libdeps since TLI was moved from Target to Analysis in r226078.

2015-01-15 05:21:00 +00:00

LoadStoreVectorizer.cpp

Add an @llvm.sideeffect intrinsic

2017-11-08 21:59:51 +00:00

LoopVectorize.cpp

[LV] Extend InstWidening with CM_Widen_Recursive