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simplify logic a bit

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53527 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-07-13 21:15:11 +00:00
parent 1347e87c7b
commit 70087f31f1
1 changed files with 10 additions and 9 deletions
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19
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -1473,9 +1473,15 @@ static bool FoldBranchToCommonDest(BranchInst *BI) {
PBI->setSuccessor(0, OldFalse);
PBI->setSuccessor(1, OldTrue);
}
Instruction::BinaryOps Opc = Instruction::Shl; // sentinel.
if (PBI->getSuccessor(0) == TrueDest && FalseDest != BB)
Opc = Instruction::Or;
else if (PBI->getSuccessor(1) == FalseDest && TrueDest != BB)
Opc = Instruction::And;
if ((PBI->getSuccessor(0) == TrueDest && FalseDest != BB) ||
(PBI->getSuccessor(1) == FalseDest && TrueDest != BB)) {
if (Opc != Instruction::Shl) {
// Clone Cond into the predecessor basic block, and or/and the
// two conditions together.
Instruction *New = Cond->clone();
@ -1483,13 +1489,8 @@ static bool FoldBranchToCommonDest(BranchInst *BI) {
New->takeName(Cond);
Cond->setName(New->getName()+".old");
Value *NewCond;
if (PBI->getSuccessor(0) == TrueDest)
NewCond = BinaryOperator::CreateOr(PBI->getCondition(), New, "or.cond",
PBI);
else
NewCond = BinaryOperator::CreateOr(PBI->getCondition(), New, "and.cond",
PBI);
Value *NewCond = BinaryOperator::Create(Opc, PBI->getCondition(),
New, "or.cond", PBI);
PBI->setCondition(NewCond);
if (PBI->getSuccessor(0) == BB) {
AddPredecessorToBlock(TrueDest, PredBlock, BB);