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Simplify code. No intended functionality/performance change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92938 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2010-01-07 19:46:15 +00:00
parent e6c74c9c2a
commit 2e0de6f771
1 changed files with 12 additions and 37 deletions
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45
lib/CodeGen/PreAllocSplitting.cpp
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@ -481,31 +481,20 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
// Search for the use in this block that precedes the instruction we care
// about, going to the fallback case if we don't find it.
if (UseI == MBB->begin())
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs,
Uses, NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
MachineBasicBlock::iterator Walker = UseI;
--Walker;
bool found = false;
while (Walker != MBB->begin()) {
--Walker;
if (BlockUses.count(Walker)) {
found = true;
break;
}
--Walker;
}
// Must check begin() too.
if (!found) {
if (BlockUses.count(Walker))
found = true;
else
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs,
Uses, NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
}
if (!found)
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs,
Uses, NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
SlotIndex UseIndex = LIs->getInstructionIndex(Walker);
UseIndex = UseIndex.getUseIndex();
@ -533,17 +522,11 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
// This case is basically a merging of the two preceding case, with the
// special note that checking for defs must take precedence over checking
// for uses, because of two-address instructions.
if (UseI == MBB->begin())
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs, Uses,
NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
MachineBasicBlock::iterator Walker = UseI;
--Walker;
bool foundDef = false;
bool foundUse = false;
while (Walker != MBB->begin()) {
--Walker;
if (BlockDefs.count(Walker)) {
foundDef = true;
break;
@ -551,20 +534,12 @@ PreAllocSplitting::PerformPHIConstruction(MachineBasicBlock::iterator UseI,
foundUse = true;
break;
}
--Walker;
}
// Must check begin() too.
if (!foundDef && !foundUse) {
if (BlockDefs.count(Walker))
foundDef = true;
else if (BlockUses.count(Walker))
foundUse = true;
else
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs,
Uses, NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
}
if (!foundDef && !foundUse)
return PerformPHIConstructionFallBack(UseI, MBB, LI, Visited, Defs,
Uses, NewVNs, LiveOut, Phis,
IsTopLevel, IsIntraBlock);
SlotIndex StartIndex = LIs->getInstructionIndex(Walker);
StartIndex = foundDef ? StartIndex.getDefIndex() : StartIndex.getUseIndex();