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Recommit "[DSE] Preserve basic block ordering using OrderedBasicBlock."

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Recommitting after addressing a buildbot failure.

This reverts commit c87869ebea000dd6483de7c7451cb36c1d36f866.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357222 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Florian Hahn
2019-03-28 23:11:00 +00:00
parent 074bfaec2b
commit 35945918f0
3 changed files with 62 additions and 39 deletions
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lib/Analysis/OrderedBasicBlock.cpp
+24
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@@ -85,3 +85,27 @@ bool OrderedBasicBlock::dominates(const Instruction *A, const Instruction *B) {
return comesBefore(A, B);
}
void OrderedBasicBlock::eraseInstruction(const Instruction *I) {
if (LastInstFound != BB->end() && I == &*LastInstFound) {
if (LastInstFound == BB->begin()) {
LastInstFound = BB->end();
NextInstPos = 0;
} else
LastInstFound--;
}
NumberedInsts.erase(I);
}
void OrderedBasicBlock::replaceInstruction(const Instruction *Old,
const Instruction *New) {
auto OI = NumberedInsts.find(Old);
if (OI == NumberedInsts.end())
return;
NumberedInsts[New] = OI->second;
if (LastInstFound != BB->end() && Old == &*LastInstFound)
LastInstFound = New->getIterator();
NumberedInsts.erase(Old);
}