[PATCH] D79100: [LV][TTI] Emit new IR intrinsic llvm.get.active.mask for tail-folded loops

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer updated this revision to Diff 266160.
SjoerdMeijer added a comment.

Thanks Eli for commenting and explaining.

I guess it was the TODO in VPlan.cpp that looked a bit suspicious. But there wasn't much going on here, that was very straightforward. so fixed that. I.e., Ayal added support for decrementing loops in VPlan recently. The Backedge Taken Count value looks slightly different for these cases, but extracting it is easy which I have added here. As a result, this now also triggers in `test/Transforms/LoopVectorize/ARM/tail-folding-counting-down.ll` which I updated


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79100/new/

https://reviews.llvm.org/D79100

Files:
  llvm/docs/LangRef.rst
  llvm/include/llvm/Analysis/TargetTransformInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/include/llvm/CodeGen/BasicTTIImpl.h
  llvm/include/llvm/IR/Intrinsics.td
  llvm/lib/Analysis/TargetTransformInfo.cpp
  llvm/lib/Target/ARM/ARMTargetTransformInfo.cpp
  llvm/lib/Target/ARM/ARMTargetTransformInfo.h
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/test/Transforms/LoopVectorize/ARM/prefer-tail-loop-folding.ll
  llvm/test/Transforms/LoopVectorize/ARM/tail-folding-counting-down.ll
  llvm/test/Transforms/LoopVectorize/ARM/tail-loop-folding.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D79100.266160.patch
Type: text/x-patch
Size: 18781 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20200526/a2f8b17e/attachment.bin>