[all-commits] [llvm/llvm-project] 9caca7: [AArch64][GlobalISel] Use the look-through constan...

[AE via All-commits]

  Branch: refs/heads/release/11.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 9caca7241d447266a23a99ea0536f30faaf19694
      https://github.com/llvm/llvm-project/commit/9caca7241d447266a23a99ea0536f30faaf19694
  Author: Amara Emerson <amara at apple.com>
  Date:   2020-12-18 (Fri, 18 Dec 2020)

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

  Log Message:
  -----------
  [AArch64][GlobalISel] Use the look-through constant helper for the shift s32->s64 custom legalization.

Almost NFC, except it catches more cases and gives a 0.1% CTMark -O0 size win.


  Commit: 43ff75f2c3feef64f9d73328230d34dac8832a91
      https://github.com/llvm/llvm-project/commit/43ff75f2c3feef64f9d73328230d34dac8832a91
  Author: Amara Emerson <amara at apple.com>
  Date:   2020-12-18 (Fri, 18 Dec 2020)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-merge-values.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-non-pow2-load-store.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-shift.mir
    M llvm/test/CodeGen/AArch64/arm64-clrsb.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Promote scalar G_SHL constant shift amounts to s64.

This was supposed to be done in the first place as is currently the case for
G_ASHR and G_LSHR but was forgotten when the original shift legalization
overhaul was done last year.

This was exposed because we started falling back on s32 = s32, s64 SHLs
due to a recent combiner change.

Gives a very minor (0.1%) code size -O0 improvement on consumer-typeset.


Compare: https://github.com/llvm/llvm-project/compare/d104e582838f...43ff75f2c3fe