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Fix right shift by 64 bits detected on CXX/lex/lex.literal/lex.ext/p4.cpp

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test case on UBSan bootstrap bot.

This fixes the last failure of "check-clang" in UBSan bootstrap bot.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217294 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-09-06 00:41:19 +00:00
parent 1bd9f9b618
commit 14b2112e24
1 changed files with 3 additions and 1 deletions
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4
lib/Support/APFloat.cpp
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@ -3377,7 +3377,9 @@ void APFloat::makeLargest(bool Negative) {
// 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