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TableGen: Avoid undefined behaviour by doing this shift in int64

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Found by ubsan. This was taking a bool and left shifting by 32 - the
result is 64 bit, so we should really do the math in a type it fits
in.

llvm-svn: 237345
This commit is contained in:
Justin Bogner 2015-05-14 06:47:02 +00:00
parent 6a3db617a1
commit 68ade96178
1 changed files with 1 additions and 1 deletions
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2
lib/TableGen/Record.cpp
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@ -230,7 +230,7 @@ Init *IntRecTy::convertValue(BitsInit *BI) {
int64_t Result = 0;
for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i)
if (BitInit *Bit = dyn_cast<BitInit>(BI->getBit(i)))
Result |= Bit->getValue() << i;
Result |= static_cast<int64_t>(Bit->getValue()) << i;
else
return nullptr;
return IntInit::get(Result);