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Cleanup: rename a variable to make the logic easier to follow.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186213 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2013-07-12 22:08:41 +00:00
parent adde9da01c
commit 7137909128
1 changed files with 7 additions and 7 deletions
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14
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -1556,29 +1556,29 @@ LinearFunctionTestReplace(Loop *L,
// BECount. This avoids materializing the add(zext(add)) expression.
Type *CntTy = BackedgeTakenCount->getType();
const SCEV *IVCount = BackedgeTakenCount;
// If the exiting block is the same as the backedge block, we prefer to
// compare against the post-incremented value, otherwise we must compare
// against the preincremented value.
Value *CmpIndVar;
const SCEV *IVCount;
if (L->getExitingBlock() == L->getLoopLatch()) {
// Add one to the "backedge-taken" count to get the trip count.
// If this addition may overflow, we have to be more pessimistic and
// cast the induction variable before doing the add.
const SCEV *N =
SE->getAddExpr(IVCount, SE->getConstant(IVCount->getType(), 1));
if (CntTy == IVCount->getType())
SE->getAddExpr(BackedgeTakenCount,
SE->getConstant(BackedgeTakenCount->getType(), 1));
if (CntTy == BackedgeTakenCount->getType())
IVCount = N;
else {
const SCEV *Zero = SE->getConstant(IVCount->getType(), 0);
const SCEV *Zero = SE->getConstant(BackedgeTakenCount->getType(), 0);
if ((isa<SCEVConstant>(N) && !N->isZero()) ||
SE->isLoopEntryGuardedByCond(L, ICmpInst::ICMP_NE, N, Zero)) {
// No overflow. Cast the sum.
IVCount = SE->getTruncateOrZeroExtend(N, CntTy);
} else {
// Potential overflow. Cast before doing the add.
IVCount = SE->getTruncateOrZeroExtend(IVCount, CntTy);
IVCount = SE->getTruncateOrZeroExtend(BackedgeTakenCount, CntTy);
IVCount = SE->getAddExpr(IVCount, SE->getConstant(CntTy, 1));
}
}
@ -1588,7 +1588,7 @@ LinearFunctionTestReplace(Loop *L,
CmpIndVar = IndVar->getIncomingValueForBlock(L->getExitingBlock());
} else {
// We must use the preincremented value...
IVCount = SE->getTruncateOrZeroExtend(IVCount, CntTy);
IVCount = SE->getTruncateOrZeroExtend(BackedgeTakenCount, CntTy);
CmpIndVar = IndVar;
}