Fix a problem where shifting by 64-bits leads to incorrect results on PPC
but not on X86 becuase shift by word size is "undefined". llvm-svn: 34825
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@ -938,7 +938,10 @@ APInt &APInt::sext(uint32_t width) {
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if (wordsBefore == wordsAfter) {
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uint32_t newWordBits = width % APINT_BITS_PER_WORD;
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// The extension is contained to the wordsBefore-1th word.
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uint64_t mask = (~0ULL >> (APINT_BITS_PER_WORD - newWordBits)) << wordBits;
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uint64_t mask = ~0ULL;
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if (newWordBits)
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mask >>= APINT_BITS_PER_WORD - newWordBits;
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mask <<= wordBits;
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if (wordsBefore == 1)
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VAL |= mask;
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else
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