From e211cd83f088ad462815676bc08b437c123cabed Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Tue, 3 Aug 2010 16:41:24 +0000
Subject: [PATCH] avoid undef behavior on minint, fixing PR7783.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110114 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/raw_ostream.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 8054ae63688..ac118a91a3f 100644
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -143,9 +143,10 @@ raw_ostream &raw_ostream::operator<<(unsigned long long N) {
 }
 
 raw_ostream &raw_ostream::operator<<(long long N) {
-  if (N <  0) {
+  if (N < 0) {
     *this << '-';
-    N = -N;
+    // Avoid undefined behavior on INT64_MIN with a cast.
+    N = -(unsigned long long)N;
   }
 
   return this->operator<<(static_cast<unsigned long long>(N));