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When creating cast scevs, canonicalize the destination type. This

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avoids duplicate scevs that differ only in type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70549 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-05-01 16:44:18 +00:00
parent fbccdef106
commit 10b9479f55
1 changed files with 9 additions and 0 deletions
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9
lib/Analysis/ScalarEvolution.cpp
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@ -649,6 +649,9 @@ SCEVHandle SCEVAddRecExpr::evaluateAtIteration(SCEVHandle It,
SCEVHandle ScalarEvolution::getTruncateExpr(const SCEVHandle &Op, const Type *Ty) {
assert(getTypeSizeInBits(Op->getType()) > getTypeSizeInBits(Ty) &&
"This is not a truncating conversion!");
assert(isSCEVable(Ty) &&
"This is not a conversion to a SCEVable type!");
Ty = getEffectiveSCEVType(Ty);
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Op))
return getUnknown(
@ -689,6 +692,9 @@ SCEVHandle ScalarEvolution::getZeroExtendExpr(const SCEVHandle &Op,
const Type *Ty) {
assert(getTypeSizeInBits(Op->getType()) < getTypeSizeInBits(Ty) &&
"This is not an extending conversion!");
assert(isSCEVable(Ty) &&
"This is not a conversion to a SCEVable type!");
Ty = getEffectiveSCEVType(Ty);
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Op)) {
const Type *IntTy = getEffectiveSCEVType(Ty);
@ -771,6 +777,9 @@ SCEVHandle ScalarEvolution::getSignExtendExpr(const SCEVHandle &Op,
const Type *Ty) {
assert(getTypeSizeInBits(Op->getType()) < getTypeSizeInBits(Ty) &&
"This is not an extending conversion!");
assert(isSCEVable(Ty) &&
"This is not a conversion to a SCEVable type!");
Ty = getEffectiveSCEVType(Ty);
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(Op)) {
const Type *IntTy = getEffectiveSCEVType(Ty);