[all-commits] [llvm/llvm-project] b84661: [X86] X86FixupVectorConstants - add destination re...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b846613837d83989d99d33f4b90db7bad019aa8c
      https://github.com/llvm/llvm-project/commit/b846613837d83989d99d33f4b90db7bad019aa8c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-02-08 (Thu, 08 Feb 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86FixupVectorConstants.cpp

  Log Message:
  -----------
  [X86] X86FixupVectorConstants - add destination register width to rebuildSplatCst/rebuildZeroUpperCst/rebuildExtCst callbacks

As found on #81136 - we aren't correctly handling for cases where the constant pool entry is wider than the destination register width, causing incorrect scaling of the truncated constant for load-extension cases.

This first patch just pulls out the destination register width argument, its still currently driven by the constant pool entry but that will be addressed in a followup.


  Commit: eb85c8edf576d27254fa37bf9ed72ec0867756f7
      https://github.com/llvm/llvm-project/commit/eb85c8edf576d27254fa37bf9ed72ec0867756f7
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-02-08 (Thu, 08 Feb 2024)

  Changed paths:
    A llvm/test/CodeGen/X86/pr81136.ll

  Log Message:
  -----------
  [X86] Add test case for #81136


  Commit: f407be32fe8084fe02c4f16842548d21afdb447f
      https://github.com/llvm/llvm-project/commit/f407be32fe8084fe02c4f16842548d21afdb447f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-02-08 (Thu, 08 Feb 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86FixupVectorConstants.cpp

  Log Message:
  -----------
  [X86] X86FixupVectorConstants - rename FixupEntry::BitWidth to FixupEntry::MemBitWidth NFC.

Make it clearer that this refers to the width of the constant element stored in memory - which won't match the register element width after a sext/zextload


Compare: https://github.com/llvm/llvm-project/compare/7d19dc50de2c...f407be32fe80