[all-commits] [llvm/llvm-project] 90e08c: [LoongArch] Add test case showing suboptimal codeg...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 90e08c260060b3cb0df31735117fd7d4331d9c64
      https://github.com/llvm/llvm-project/commit/90e08c260060b3cb0df31735117fd7d4331d9c64
  Author: WANG Rui <wangrui at loongson.cn>
  Date:   2023-07-24 (Mon, 24 Jul 2023)

  Changed paths:
    A llvm/test/CodeGen/LoongArch/zext-with-load-is-free.ll

  Log Message:
  -----------
  [LoongArch] Add test case showing suboptimal codegen when loading unsigned char/short

Implementing isZextFree will allow ld.bu or ld.hu to be selected rather than ld.b+mask and ld.h+mask.

Signed-off-by: WANG Rui <wangrui at loongson.cn>

Reviewed By: SixWeining, xen0n

Differential Revision: https://reviews.llvm.org/D154818


  Commit: 9c21f9554114d00cda0d022f3e5a8d8fa6ddbe90
      https://github.com/llvm/llvm-project/commit/9c21f9554114d00cda0d022f3e5a8d8fa6ddbe90
  Author: WANG Rui <wangrui at loongson.cn>
  Date:   2023-07-24 (Mon, 24 Jul 2023)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.h
    M llvm/test/CodeGen/LoongArch/zext-with-load-is-free.ll

  Log Message:
  -----------
  [LoongArch] Implement isZextFree

This returns true for 8-bit and 16-bit loads, allowing ld.bu/ld.hu to be selected and avoiding unnecessary masks.

Signed-off-by: WANG Rui <wangrui at loongson.cn>

Reviewed By: SixWeining, xen0n

Differential Revision: https://reviews.llvm.org/D154819


Compare: https://github.com/llvm/llvm-project/compare/899aaffcbc3a...9c21f9554114