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authorJames Molloy <james.molloy@arm.com>2012-11-17 17:56:30 +0000
committerJames Molloy <james.molloy@arm.com>2012-11-17 17:56:30 +0000
commitb9478c2aef060aa6b0ede41c05859c34b1527bf8 (patch)
tree4c896b2e5249460cc25c158c72a750cc4ad118f5 /lib/VMCore
parent9e6ee16b1814268897965b81e82a74ef39173ee1 (diff)
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Add a new function to ConstantExpr - getAsInstruction. This returns its Instruction* corollary, which may be useful if a user
wishes to transform a ConstantExpr so that one of its operands is no longer constant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168262 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore')
-rw-r--r--lib/VMCore/Constants.cpp63
1 files changed, 63 insertions, 0 deletions
diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index 935f6b2..a451430 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -2704,3 +2704,66 @@ void ConstantExpr::replaceUsesOfWithOnConstant(Value *From, Value *ToV,
// Delete the old constant!
destroyConstant();
}
+
+Instruction *ConstantExpr::getAsInstruction() {
+ SmallVector<Value*,4> ValueOperands;
+ for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
+ ValueOperands.push_back(cast<Value>(I));
+
+ ArrayRef<Value*> Ops(ValueOperands);
+
+ switch (getOpcode()) {
+ case Instruction::Trunc:
+ case Instruction::ZExt:
+ case Instruction::SExt:
+ case Instruction::FPTrunc:
+ case Instruction::FPExt:
+ case Instruction::UIToFP:
+ case Instruction::SIToFP:
+ case Instruction::FPToUI:
+ case Instruction::FPToSI:
+ case Instruction::PtrToInt:
+ case Instruction::IntToPtr:
+ case Instruction::BitCast:
+ return CastInst::Create((Instruction::CastOps)getOpcode(),
+ Ops[0], getType());
+ case Instruction::Select:
+ return SelectInst::Create(Ops[0], Ops[1], Ops[2]);
+ case Instruction::InsertElement:
+ return InsertElementInst::Create(Ops[0], Ops[1], Ops[2]);
+ case Instruction::ExtractElement:
+ return ExtractElementInst::Create(Ops[0], Ops[1]);
+ case Instruction::InsertValue:
+ return InsertValueInst::Create(Ops[0], Ops[1], getIndices());
+ case Instruction::ExtractValue:
+ return ExtractValueInst::Create(Ops[0], getIndices());
+ case Instruction::ShuffleVector:
+ return new ShuffleVectorInst(Ops[0], Ops[1], Ops[2]);
+
+ case Instruction::GetElementPtr:
+ if (cast<GEPOperator>(this)->isInBounds())
+ return GetElementPtrInst::CreateInBounds(Ops[0], Ops.slice(1));
+ else
+ return GetElementPtrInst::Create(Ops[0], Ops.slice(1));
+
+ case Instruction::ICmp:
+ case Instruction::FCmp:
+ return CmpInst::Create((Instruction::OtherOps)getOpcode(),
+ getPredicate(), Ops[0], Ops[1]);
+
+ default:
+ assert(getNumOperands() == 2 && "Must be binary operator?");
+ BinaryOperator *BO =
+ BinaryOperator::Create((Instruction::BinaryOps)getOpcode(),
+ Ops[0], Ops[1]);
+ if (isa<OverflowingBinaryOperator>(BO)) {
+ BO->setHasNoUnsignedWrap(SubclassOptionalData &
+ OverflowingBinaryOperator::NoUnsignedWrap);
+ BO->setHasNoSignedWrap(SubclassOptionalData &
+ OverflowingBinaryOperator::NoSignedWrap);
+ }
+ if (isa<PossiblyExactOperator>(BO))
+ BO->setIsExact(SubclassOptionalData & PossiblyExactOperator::IsExact);
+ return BO;
+ }
+}