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[AMDGPU] : revert r315908

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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
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@@ -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;
}