avoid undef behavior on minint, fixing PR7783.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110114 91177308-0d34-0410-b5e6-96231b3b80d8
CIB · Aug 3, 2010 · e211cd8 · e211cd8
1 parent 3bababf
commit e211cd8
Showing 1 changed file with 3 additions and 2 deletions.
diff --git 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));