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[AMDGPU] : revert r315908 

llvm-svn: 315916
This commit is contained in:
Alexander Timofeev 2017-10-16 16:57:37 +00:00
parent 9b3d627280
commit 9dff31c769
2 changed files with 11 additions and 40 deletions
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24
llvm/lib/CodeGen/MachineCopyPropagation.cpp
View File

@ -275,21 +275,19 @@ void MachineCopyPropagation::CopyPropagateBlock(MachineBasicBlock &MBB) {
ClobberRegister(Reg);
}
if (!MI->getOperand(0).isDead() && !MI->getOperand(1).isUndef()) {
// Remember Def is defined by the copy.
for (MCSubRegIterator SR(Def, TRI, /*IncludeSelf=*/true); SR.isValid();
++SR) {
CopyMap[*SR] = MI;
AvailCopyMap[*SR] = MI;
}
// Remember source that's copied to Def. Once it's clobbered, then
// it's no longer available for copy propagation.
RegList &DestList = SrcMap[Src];
if (!is_contained(DestList, Def))
DestList.push_back(Def);
// Remember Def is defined by the copy.
for (MCSubRegIterator SR(Def, TRI, /*IncludeSelf=*/true); SR.isValid();
++SR) {
CopyMap[*SR] = MI;
AvailCopyMap[*SR] = MI;
}
// Remember source that's copied to Def. Once it's clobbered, then
// it's no longer available for copy propagation.
RegList &DestList = SrcMap[Src];
if (!is_contained(DestList, Def))
DestList.push_back(Def);
continue;
}

27
llvm/test/CodeGen/AMDGPU/dead_copy.mir
View File

@ -1,27 +0,0 @@
# RUN: llc -o - %s -march=amdgcn -mcpu=fiji -run-pass=machine-cp -verify-machineinstrs | FileCheck -check-prefix=GCN %s
# GCN-LABEL: dead_copy
# GCN: bb.0
# GCN-NOT: dead %vgpr5 = COPY undef %vgpr11, implicit %exec
# GCN: %vgpr5 = COPY %vgpr11, implicit %exec
---
name: dead_copy
body: |
bb.0:
liveins: %vgpr11, %sgpr0, %sgpr1, %vgpr6, %vgpr7, %vgpr4
dead %vgpr5 = COPY undef %vgpr11, implicit %exec
%vgpr5 = COPY %vgpr11, implicit %exec
%sgpr14 = S_ADD_U32 %sgpr0, target-flags(amdgpu-gotprel) 1136, implicit-def %scc
%sgpr15 = S_ADDC_U32 %sgpr1, target-flags(amdgpu-gotprel32-lo) 0, implicit-def dead %scc, implicit %scc
%vgpr10 = COPY killed %sgpr14, implicit %exec
%vgpr11 = COPY killed %sgpr15, implicit %exec
FLAT_STORE_DWORDX4 %vgpr10_vgpr11, %vgpr4_vgpr5_vgpr6_vgpr7, 0, 0, 0, implicit %exec, implicit %flat_scr
...