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Handle multiple induction variables.

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This fixes PR714.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42309 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2007-09-25 18:24:48 +00:00
parent a37c9f7506
commit a6dff2faeb
2 changed files with 73 additions and 7 deletions
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21
lib/Transforms/Scalar/LoopIndexSplit.cpp
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@@ -676,7 +676,7 @@ bool LoopIndexSplit::safeExitingBlock(SplitInfo &SD,
continue;
// Check if I is induction variable increment instruction.
if (!IndVarIncrement && I->getOpcode() == Instruction::Add) {
if (I->getOpcode() == Instruction::Add) {
Value *Op0 = I->getOperand(0);
Value *Op1 = I->getOperand(1);
@@ -685,16 +685,23 @@ bool LoopIndexSplit::safeExitingBlock(SplitInfo &SD,
if ((PN = dyn_cast<PHINode>(Op0))) {
if ((CI = dyn_cast<ConstantInt>(Op1)))
IndVarIncrement = I;
if (CI->isOne()) {
if (!IndVarIncrement && PN == IndVar)
IndVarIncrement = I;
// else this is another loop induction variable
continue;
}
} else
if ((PN = dyn_cast<PHINode>(Op1))) {
if ((CI = dyn_cast<ConstantInt>(Op0)))
IndVarIncrement = I;
if (CI->isOne()) {
if (!IndVarIncrement && PN == IndVar)
IndVarIncrement = I;
// else this is another loop induction variable
continue;
}
}
if (IndVarIncrement && PN == IndVar && CI->isOne())
continue;
}
}
// I is an Exit condition if next instruction is block terminator.
// Exit condition is OK if it compares loop invariant exit value,