[all-commits] [llvm/llvm-project] d0f122: [LV] Update incoming blocks in VPWidenPHIRecipe in...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d0f122b9c5a5c6d26971d7ed57aeed8606da1ade
      https://github.com/llvm/llvm-project/commit/d0f122b9c5a5c6d26971d7ed57aeed8606da1ade
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-02-07 (Fri, 07 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlan.h
    M llvm/lib/Transforms/Vectorize/VPlanUtils.h
    M llvm/unittests/Transforms/Vectorize/VPlanTest.cpp

  Log Message:
  -----------
  [LV] Update incoming blocks in VPWidenPHIRecipe in reassociateBlocks (#125481)

This is extracted from #118638

After c7ebe4f we will crash in fixNonInductionPHIs if we use a
VPWidenPHIRecipe with the vector preheader as an incoming block, because
the phi will reference the old non-IRBB vector preheader.

This fixes this by updating VPBlockUtils::reassociateBlocks to update
any VPWidenPHIRecipes's incoming blocks.

This assumes that if the VPWidenPHIRecipe is in a VPRegionBlock, it's in
the entry block, and that we are replacing a VPBasicBlock with another
VPBasicBlock.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications