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Added constant folding support for the extractelement operation.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Robert Bocchino 2006-01-10 20:03:46 +00:00
parent 5e1b72c153
commit bb90a7aa7b
4 changed files with 16 additions and 0 deletions
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10
lib/VMCore/ConstantFold.cpp
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@ -724,6 +724,16 @@ Constant *llvm::ConstantFoldSelectInstruction(const Constant *Cond,
return 0;
}
Constant *llvm::ConstantFoldExtractElementInstruction(const Constant *Val,
const Constant *Idx) {
if (const ConstantPacked *CVal = dyn_cast<ConstantPacked>(Val)) {
if (const ConstantUInt *CIdx = dyn_cast<ConstantUInt>(Idx)) {
return const_cast<Constant*>(CVal->getOperand(CIdx->getValue()));
}
}
return 0;
}
/// isZeroSizedType - This type is zero sized if its an array or structure of
/// zero sized types. The only leaf zero sized type is an empty structure.
static bool isMaybeZeroSizedType(const Type *Ty) {

2
lib/VMCore/ConstantFold.h
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@ -31,6 +31,8 @@ namespace llvm {
Constant *ConstantFoldSelectInstruction(const Constant *Cond,
const Constant *V1,
const Constant *V2);
Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
const Constant *Idx);
Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
const Constant *V2);
Constant *ConstantFoldGetElementPtr(const Constant *C,

2
lib/VMCore/ConstantFolding.h
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@ -31,6 +31,8 @@ namespace llvm {
Constant *ConstantFoldSelectInstruction(const Constant *Cond,
const Constant *V1,
const Constant *V2);
Constant *ConstantFoldExtractElementInstruction(const Constant *Val,
const Constant *Idx);
Constant *ConstantFoldBinaryInstruction(unsigned Opcode, const Constant *V1,
const Constant *V2);
Constant *ConstantFoldGetElementPtr(const Constant *C,

2
lib/VMCore/Constants.cpp
View File

@ -1403,6 +1403,8 @@ Constant *ConstantExpr::getGetElementPtr(Constant *C,
Constant *ConstantExpr::getExtractElementTy(const Type *ReqTy, Constant *Val,
Constant *Idx) {
if (Constant *FC = ConstantFoldExtractElementInstruction(Val, Idx))
return FC; // Fold a few common cases...
// Look up the constant in the table first to ensure uniqueness
std::vector<Constant*> ArgVec(1, Val);
ArgVec.push_back(Idx);