[PATCH] D125296: [VP] vp intrinsics are not speculatable

[Simon Moll via Phabricator via llvm-commits]

simoll updated this revision to Diff 431976.
simoll edited the summary of this revision.
simoll added a comment.

VP intrinsics show UB if the %evl parameter is out of bounds - they must not carry the speculatable attribute.  The out-of-bounds UB disappears when the %evl parameter is expanded into the mask or expansion replaces the entire VP intrinsic with non-VP code.

      

This patch

- Removes the speculatable attribute on all VP intrinsics.
- Generalizes the isSafeToSpeculativelyExecute function to let VP expansion know whether the VP intrinsic replacement will be speculatable.  VP expansion may only discard %evl where this is the case.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D125296/new/

https://reviews.llvm.org/D125296

Files:
  llvm/include/llvm/Analysis/ValueTracking.h
  llvm/include/llvm/IR/Intrinsics.td
  llvm/lib/Analysis/ValueTracking.cpp
  llvm/lib/CodeGen/ExpandVectorPredication.cpp

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