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When it doesn't matter whether zero or sign extension is used, 

use ScalarEvolutions "any" extend function.

llvm-svn: 102156
This commit is contained in:
Dan Gohman 2010-04-23 01:51:29 +00:00
parent e9135cb3fb
commit ff3174e97f
1 changed files with 2 additions and 6 deletions
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8
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -1355,9 +1355,7 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
}
LargeOps.push_back(T->getOperand());
} else if (const SCEVConstant *C = dyn_cast<SCEVConstant>(Ops[i])) {
// This could be either sign or zero extension, but sign extension
// is much more likely to be foldable here.
LargeOps.push_back(getSignExtendExpr(C, SrcType));
LargeOps.push_back(getAnyExtendExpr(C, SrcType));
} else if (const SCEVMulExpr *M = dyn_cast<SCEVMulExpr>(Ops[i])) {
SmallVector<const SCEV *, 8> LargeMulOps;
for (unsigned j = 0, f = M->getNumOperands(); j != f && Ok; ++j) {
@ -1370,9 +1368,7 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
LargeMulOps.push_back(T->getOperand());
} else if (const SCEVConstant *C =
dyn_cast<SCEVConstant>(M->getOperand(j))) {
// This could be either sign or zero extension, but sign extension
// is much more likely to be foldable here.
LargeMulOps.push_back(getSignExtendExpr(C, SrcType));
LargeMulOps.push_back(getAnyExtendExpr(C, SrcType));
} else {
Ok = false;
break;