[all-commits] [llvm/llvm-project] 961c66: [X86] shrinkAndImmediate - bail on failed constant...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 961c66c57144ac46b65277338d9d1ebdc284e0df
      https://github.com/llvm/llvm-project/commit/961c66c57144ac46b65277338d9d1ebdc284e0df
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-11-28 (Thu, 28 Nov 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
    M llvm/test/CodeGen/X86/pr114360.ll

  Log Message:
  -----------
  [X86] shrinkAndImmediate - bail on failed constant fold

Workaround for issue #114360 where shrinkAndImmediate folds away the AND after the ZEXT has already been folded away to SUBREG_TO_REG losing the implicit zext guarantee.

There's the possibility that other instructions can result in a similar regression, but this is a stopgap until I can investigate whether shrinkAndImmediate needs to be replaced entirely.

Fixes #114360



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