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When creating cast scevs, canonicalize the destination type. This 

avoids duplicate scevs that differ only in type.

llvm-svn: 70549
This commit is contained in:
Dan Gohman 2009-05-01 16:44:18 +00:00
parent cee10c5351
commit 194e42c612
1 changed files with 9 additions and 0 deletions
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9
llvm/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);