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authorRobert Bocchino <bocchino@illinois.edu>2006-01-10 20:03:46 +0000
committerRobert Bocchino <bocchino@illinois.edu>2006-01-10 20:03:46 +0000
commitbb90a7aa7bf71311046ccc9f277e5f76cc082722 (patch)
tree0a29b904c6337ba50b7b6f7b8b3ede2677e6da25 /lib/VMCore
parent5e1b72c153dafaaf73e82c2c76f93ed55d74a889 (diff)
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Added constant folding support for the extractelement operation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25187 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore')
-rw-r--r--lib/VMCore/ConstantFold.cpp10
-rw-r--r--lib/VMCore/ConstantFold.h2
-rw-r--r--lib/VMCore/ConstantFolding.h2
-rw-r--r--lib/VMCore/Constants.cpp2
4 files changed, 16 insertions, 0 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp
index 40a51cc..3f7bc7d 100644
--- a/lib/VMCore/ConstantFold.cpp
+++ b/lib/VMCore/ConstantFold.cpp
@@ -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) {
diff --git a/lib/VMCore/ConstantFold.h b/lib/VMCore/ConstantFold.h
index a864aa2..e8580c4 100644
--- a/lib/VMCore/ConstantFold.h
+++ b/lib/VMCore/ConstantFold.h
@@ -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,
diff --git a/lib/VMCore/ConstantFolding.h b/lib/VMCore/ConstantFolding.h
index a864aa2..e8580c4 100644
--- a/lib/VMCore/ConstantFolding.h
+++ b/lib/VMCore/ConstantFolding.h
@@ -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,
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 610ed78..f4ff31f 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -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);