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RegAlloc: Fix verifier error with undef identity copies

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The code did not match the example in the comment, and was checking
the undef flag on the copy dest instead of source. The existing tests
were only hitting the > 2 operands case.

llvm-svn: 361156
This commit is contained in:
Matt Arsenault 2019-05-20 14:09:36 +00:00
parent 3e1821bf43
commit 7c8ec18964
2 changed files with 70 additions and 1 deletions
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2
llvm/lib/CodeGen/VirtRegMap.cpp
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@ -384,7 +384,7 @@ void VirtRegRewriter::handleIdentityCopy(MachineInstr &MI) const {
// give us additional liveness information: The target (super-)register
// must not be valid before this point. Replace the COPY with a KILL
// instruction to maintain this information.
if (MI.getOperand(0).isUndef() || MI.getNumOperands() > 2) {
if (MI.getOperand(1).isUndef() || MI.getNumOperands() > 2) {
MI.setDesc(TII->get(TargetOpcode::KILL));
LLVM_DEBUG(dbgs() << " replace by: " << MI);
return;

69
llvm/test/CodeGen/AMDGPU/virtregrewrite-undef-identity-copy.mir Normal file
View File

@ -0,0 +1,69 @@
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=amdgcn-amd-amdhsa -start-before=greedy -stop-after=virtregrewriter -verify-machineinstrs -o - %s | FileCheck %s
# The undef copy of %4 is allocated to $vgpr3, and the identity copy
# was deleted, and $vgpr3 was considered undef. The code to replace
# the undef copy with a kill was incorrectly checking the dest
# operand, rather than the source.
--- |
define amdgpu_kernel void @undef_identity_copy() {
ret void
}
declare hidden float @bar(<4 x float>)
declare hidden void @foo()
...
---
name: undef_identity_copy
tracksRegLiveness: true
frameInfo:
maxAlignment: 4
hasCalls: true
machineFunctionInfo:
isEntryFunction: true
scratchRSrcReg: '$sgpr0_sgpr1_sgpr2_sgpr3'
scratchWaveOffsetReg: '$sgpr95'
frameOffsetReg: '$sgpr95'
stackPtrOffsetReg: '$sgpr32'
body: |
bb.0:
; CHECK-LABEL: name: undef_identity_copy
; CHECK: renamable $vgpr32_vgpr33_vgpr34_vgpr35 = FLAT_LOAD_DWORDX4 undef renamable $vgpr0_vgpr1, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (load 16, addrspace 1)
; CHECK: renamable $sgpr6_sgpr7 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @foo + 4, target-flags(amdgpu-rel32-hi) @foo + 4, implicit-def dead $scc
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
; CHECK: $sgpr4 = COPY $sgpr95
; CHECK: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @foo, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4
; CHECK: ADJCALLSTACKDOWN 0, 4, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
; CHECK: renamable $sgpr6_sgpr7 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @bar + 4, target-flags(amdgpu-rel32-hi) @bar + 4, implicit-def dead $scc
; CHECK: ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
; CHECK: $sgpr4 = COPY $sgpr95
; CHECK: $vgpr0 = COPY renamable $vgpr32
; CHECK: $vgpr1 = COPY renamable $vgpr33
; CHECK: $vgpr2 = COPY renamable $vgpr34
; CHECK: $vgpr3 = KILL undef renamable $vgpr3
; CHECK: dead $sgpr30_sgpr31 = SI_CALL killed renamable $sgpr6_sgpr7, @bar, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit $vgpr0, implicit killed $vgpr1, implicit killed $vgpr2, implicit killed $vgpr3, implicit-def $vgpr0
; CHECK: ADJCALLSTACKDOWN 0, 4, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
; CHECK: FLAT_STORE_DWORD undef renamable $vgpr0_vgpr1, killed renamable $vgpr0, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (store 4, addrspace 1)
; CHECK: S_ENDPGM 0
%0:vreg_128 = FLAT_LOAD_DWORDX4 undef %1:vreg_64, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (load 16, addrspace 1)
%2:sreg_64 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @foo + 4, target-flags(amdgpu-rel32-hi) @foo + 4, implicit-def dead $scc
ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
$sgpr4 = COPY $sgpr95
dead $sgpr30_sgpr31 = SI_CALL %2, @foo, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4
ADJCALLSTACKDOWN 0, 4, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
%3:sreg_64 = SI_PC_ADD_REL_OFFSET target-flags(amdgpu-rel32-lo) @bar + 4, target-flags(amdgpu-rel32-hi) @bar + 4, implicit-def dead $scc
ADJCALLSTACKUP 0, 0, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
$sgpr4 = COPY $sgpr95
$vgpr0 = COPY %0.sub0
$vgpr1 = COPY %0.sub1
$vgpr2 = COPY %0.sub2
$vgpr3 = COPY undef %4:vgpr_32
dead $sgpr30_sgpr31 = SI_CALL %3, @bar, csr_amdgpu_highregs, implicit $sgpr0_sgpr1_sgpr2_sgpr3, implicit $sgpr4, implicit $vgpr0, implicit killed $vgpr1, implicit killed $vgpr2, implicit killed $vgpr3, implicit-def $vgpr0
%5:vgpr_32 = COPY $vgpr0
ADJCALLSTACKDOWN 0, 4, implicit-def $sgpr32, implicit $sgpr32, implicit $sgpr95
FLAT_STORE_DWORD undef %6:vreg_64, %5, 0, 0, 0, 0, implicit $exec, implicit $flat_scr :: (store 4, addrspace 1)
S_ENDPGM 0
...