[all-commits] [llvm/llvm-project] 07c8bc: [AArch64] Narrow G_SEXT_INREG to s64 before lowering.

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 07c8bcc21df6e05e59976c3fa19455fb7bb56e01
      https://github.com/llvm/llvm-project/commit/07c8bcc21df6e05e59976c3fa19455fb7bb56e01
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2023-08-07 (Mon, 07 Aug 2023)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-saddsat.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-ssubsat.mir

  Log Message:
  -----------
  [AArch64] Narrow G_SEXT_INREG to s64 before lowering.

This avoids narrowing after it has been expanded to shifts. The
G_SEXT_INREG narrowing can use the second operand of the instruction to
optimize the narrowing.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D157172