Add FNeg IR constant folding support

llvm-svn: 359982

1 files changed, 10 insertions, 1 deletions

diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp
index 74468e8dd72..2ea1e7dea82 100644
--- a/llvm/lib/Analysis/ConstantFolding.cpp
+++ b/llvm/lib/Analysis/ConstantFolding.cpp
@@ -999,7 +999,9 @@ Constant *ConstantFoldInstOperandsImpl(const Value *InstOrCE, unsigned Opcode,
                                        const TargetLibraryInfo *TLI) {
   Type *DestTy = InstOrCE->getType();
 
-  // Handle easy binops first.
+  if (Instruction::isUnaryOp(Opcode))
+    return ConstantFoldUnaryOpOperand(Opcode, Ops[0], DL);
+
   if (Instruction::isBinaryOp(Opcode))
     return ConstantFoldBinaryOpOperands(Opcode, Ops[0], Ops[1], DL);
 
@@ -1262,6 +1264,13 @@ Constant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate,
   return ConstantExpr::getCompare(Predicate, Ops0, Ops1);
 }
 
+Constant *llvm::ConstantFoldUnaryOpOperand(unsigned Opcode, Constant *Op,
+                                           const DataLayout &DL) {
+  assert(Instruction::isUnaryOp(Opcode));
+
+  return ConstantExpr::get(Opcode, Op);
+}
+
 Constant *llvm::ConstantFoldBinaryOpOperands(unsigned Opcode, Constant *LHS,
                                              Constant *RHS,
                                              const DataLayout &DL) {