Fix right shift by 64 bits detected on CXX/lex/lex.literal/lex.ext/p4.cpp
test case on UBSan bootstrap bot.
This fixes the last failure of "check-clang" in UBSan bootstrap bot.
llvm-svn: 217294
diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index 7989e30..097986d 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -3377,7 +3377,9 @@
// internal consistency.
const unsigned NumUnusedHighBits =
PartCount*integerPartWidth - semantics->precision;
- significand[PartCount - 1] = ~integerPart(0) >> NumUnusedHighBits;
+ significand[PartCount - 1] = (NumUnusedHighBits < integerPartWidth)
+ ? (~integerPart(0) >> NumUnusedHighBits)
+ : 0;
}
/// Make this number the smallest magnitude denormal number in the given