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Address Duncan's comments on r167121.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167130 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg 2012-10-31 15:31:09 +00:00
parent 72465ea23d
commit daf4cfc8d8
1 changed files with 4 additions and 3 deletions
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7
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -3201,7 +3201,7 @@ static bool ValidLookupTableConstant(Constant *C) {
}
/// LookupConstant - If V is a Constant, return it. Otherwise, try to look up
/// its constant value in ConstantPool, returning NULL if it's not there.
/// its constant value in ConstantPool, returning 0 if it's not there.
static Constant *LookupConstant(Value *V,
const SmallDenseMap<Value*, Constant*>& ConstantPool) {
if (Constant *C = dyn_cast<Constant>(V))
@ -3212,7 +3212,7 @@ static Constant *LookupConstant(Value *V,
/// ConstantFold - Try to fold instruction I into a constant. This works for
/// simple instructions such as binary operations where both operands are
/// constant or can be replaced by constants from the ConstantPool. Returns the
/// resulting constant on success, NULL otherwise.
/// resulting constant on success, 0 otherwise.
static Constant *ConstantFold(Instruction *I,
const SmallDenseMap<Value*, Constant*>& ConstantPool) {
if (BinaryOperator *BO = dyn_cast<BinaryOperator>(I)) {
@ -3243,6 +3243,7 @@ static Constant *ConstantFold(Instruction *I,
return LookupConstant(Select->getTrueValue(), ConstantPool);
if (A->isNullValue())
return LookupConstant(Select->getFalseValue(), ConstantPool);
return 0;
}
if (CastInst *Cast = dyn_cast<CastInst>(I)) {
@ -3257,7 +3258,7 @@ static Constant *ConstantFold(Instruction *I,
/// GetCaseResults - Try to determine the resulting constant values in phi nodes
/// at the common destination basic block, *CommonDest, for one of the case
/// destionations CaseDest corresponding to value CaseVal (NULL for the default
/// destionations CaseDest corresponding to value CaseVal (0 for the default
/// case), of a switch instruction SI.
static bool GetCaseResults(SwitchInst *SI,
ConstantInt *CaseVal,