[IR] Add a dedicated FNeg IR Instruction
The IEEE-754 Standard makes it clear that fneg(x) and
fsub(-0.0, x) are two different operations. The former is a bitwise
operation, while the latter is an arithmetic operation. This patch
creates a dedicated FNeg IR Instruction to model that behavior.
Differential Revision: https://reviews.llvm.org/D53877
llvm-svn: 346774
diff --git a/llvm/lib/IR/Instructions.cpp b/llvm/lib/IR/Instructions.cpp
index 0295da9..7d15903 100644
--- a/llvm/lib/IR/Instructions.cpp
+++ b/llvm/lib/IR/Instructions.cpp
@@ -1957,6 +1957,59 @@
}
//===----------------------------------------------------------------------===//
+// UnaryOperator Class
+//===----------------------------------------------------------------------===//
+
+UnaryOperator::UnaryOperator(UnaryOps iType, Value *S,
+ Type *Ty, const Twine &Name,
+ Instruction *InsertBefore)
+ : UnaryInstruction(Ty, iType, S, InsertBefore) {
+ Op<0>() = S;
+ setName(Name);
+ AssertOK();
+}
+
+UnaryOperator::UnaryOperator(UnaryOps iType, Value *S,
+ Type *Ty, const Twine &Name,
+ BasicBlock *InsertAtEnd)
+ : UnaryInstruction(Ty, iType, S, InsertAtEnd) {
+ Op<0>() = S;
+ setName(Name);
+ AssertOK();
+}
+
+UnaryOperator *UnaryOperator::Create(UnaryOps Op, Value *S,
+ const Twine &Name,
+ Instruction *InsertBefore) {
+ return new UnaryOperator(Op, S, S->getType(), Name, InsertBefore);
+}
+
+UnaryOperator *UnaryOperator::Create(UnaryOps Op, Value *S,
+ const Twine &Name,
+ BasicBlock *InsertAtEnd) {
+ UnaryOperator *Res = Create(Op, S, Name);
+ InsertAtEnd->getInstList().push_back(Res);
+ return Res;
+}
+
+void UnaryOperator::AssertOK() {
+ Value *LHS = getOperand(0);
+ (void)LHS; // Silence warnings.
+#ifndef NDEBUG
+ switch (getOpcode()) {
+ case FNeg:
+ assert(getType() == LHS->getType() &&
+ "Unary operation should return same type as operand!");
+ assert(getType()->isFPOrFPVectorTy() &&
+ "Tried to create a floating-point operation on a "
+ "non-floating-point type!");
+ break;
+ default: llvm_unreachable("Invalid opcode provided");
+ }
+#endif
+}
+
+//===----------------------------------------------------------------------===//
// BinaryOperator Class
//===----------------------------------------------------------------------===//
@@ -3697,6 +3750,10 @@
return new (getNumOperands()) GetElementPtrInst(*this);
}
+UnaryOperator *UnaryOperator::cloneImpl() const {
+ return Create(getOpcode(), Op<0>());
+}
+
BinaryOperator *BinaryOperator::cloneImpl() const {
return Create(getOpcode(), Op<0>(), Op<1>());
}