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Fix undefined behavior (left shift by 64 bits) in ScaledNumber::toString().

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This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216116 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-08-20 18:30:07 +00:00
parent 3deb3e32b2
commit 242320399f
1 changed files with 3 additions and 0 deletions
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3
lib/Support/ScaledNumber.cpp
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@ -220,6 +220,9 @@ std::string ScaledNumberBase::toString(uint64_t D, int16_t E, int Width,
} else if (E > -64) {
Above0 = D >> -E;
Below0 = D << (64 + E);
} else if (E == -64) {
// Special case: shift by 64 bits is undefined behavior.
Below0 = D;
} else if (E > -120) {
Below0 = D >> (-E - 64);
Extra = D << (128 + E);