Support: Remove undefined behavior from &raw_ostream::operator<<

Don't negate signed integer types in &raw_ostream::operator<<(const
FormattedNumber &FN).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218496 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/raw_ostream.cpp b/lib/Support/raw_ostream.cpp
index 0fd0cdfa937a1aa825cc945a8d363989b58cfb41..c2c55cff7ed9ee600cf3723807c08ba589187124 100644 (file)
--- a/lib/Support/raw_ostream.cpp
+++ b/lib/Support/raw_ostream.cpp
@@ -433,7 +433,7 @@ raw_ostream &raw_ostream::operator<<(const FormattedNumber &FN) {
     char *EndPtr = NumberBuffer+sizeof(NumberBuffer);
     char *CurPtr = EndPtr;
     bool Neg = (FN.DecValue < 0);
-    uint64_t N = Neg ? -FN.DecValue : FN.DecValue;
+    uint64_t N = Neg ? -static_cast<uint64_t>(FN.DecValue) : FN.DecValue;
     while (N) {
       *--CurPtr = '0' + char(N % 10);
       N /= 10;