From bcb37fd22f0345bdfd30c57e8a7f22fc6080e20a Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Thu, 11 Sep 2008 18:53:02 +0000
Subject: [PATCH] Fix a copy+paste bug that Duncan spotted. For several cases
 it was still getting lucky and detecting overflow but it was clearly
 incorrect.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56113 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/InstructionCombining.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 46ac762b0a7..5a9d1de2e35 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -4699,7 +4699,7 @@ static bool AddWithOverflow(ConstantInt *&Result, ConstantInt *In1,
 /// overflowed for this type.
 static bool SubWithOverflow(ConstantInt *&Result, ConstantInt *In1,
                             ConstantInt *In2, bool IsSigned = false) {
-  Result = cast<ConstantInt>(Add(In1, In2));
+  Result = cast<ConstantInt>(Subtract(In1, In2));
 
   if (IsSigned)
     if (In2->getValue().isNegative())