[all-commits] [llvm/llvm-project] 7736ce: AMDGPU: Clear kill flags when optimizing vcmp save...

[Konstantin Zhuravlyov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7736ce1c56c77290cb3ce72ece8e4025fb9e2b22
      https://github.com/llvm/llvm-project/commit/7736ce1c56c77290cb3ce72ece8e4025fb9e2b22
  Author: Konstantin Zhuravlyov <kzhuravl_dev at outlook.com>
  Date:   2022-06-24 (Fri, 24 Jun 2022)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIOptimizeExecMasking.cpp
    A llvm/test/CodeGen/AMDGPU/vcmp-saveexec-to-vcmpx-wrong-kill-flags.mir

  Log Message:
  -----------
  AMDGPU: Clear kill flags when optimizing vcmp save exec sequence

It was causing bad machine code for several blender scenes:
  *** Bad machine code: Using an undefined physical register ***
  - function:    kernel_holdout_emission_blurring_pathtermination_ao
  - basic block: %bb.28 if.end40.i (0x7f84861a2320)
  - instruction: V_CMPX_EQ_U32_nosdst_e64 0, $vgpr3, implicit-def $exec, implicit $exec
  - operand 1:   $vgpr3

Differential Revision: https://reviews.llvm.org/D127768