[all-commits] [llvm/llvm-project] b8173c: [AMDGPU] Stop mulhi from doing 24 bit mul for unif...

[David Stuttard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b8173c317812a51354e2874ee6dd5c3150d98ac8
      https://github.com/llvm/llvm-project/commit/b8173c317812a51354e2874ee6dd5c3150d98ac8
  Author: David Stuttard <david.stuttard at amd.com>
  Date:   2021-07-05 (Mon, 05 Jul 2021)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUSubtarget.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUSubtarget.h
    M llvm/test/CodeGen/AMDGPU/mul_int24.ll
    M llvm/test/CodeGen/AMDGPU/mul_uint24-amdgcn.ll

  Log Message:
  -----------
  [AMDGPU] Stop mulhi from doing 24 bit mul for uniform values

Added support to check if architecture supports s_mulhi which is used as part of
the decision whether or not to use valu 24 bit mul (if the mulhi gets
transformed to a valu op anyway, then may as well use it).

This is an extension of the work in D97063

Differential Revision: https://reviews.llvm.org/D103321

Change-Id: I80b1323de640a52623d69ac005a97d06a5d42a14