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[APInt] Slightly simplify APInt::ashrSlowCase. NFC #111220

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Oct 5, 2024
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[APInt] Slightly simplify APInt::ashrSlowCase. NFC #111220

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7 changes: 3 additions & 4 deletions llvm/lib/Support/APInt.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1055,11 +1055,10 @@ void APInt::ashrSlowCase(unsigned ShiftAmt) {
U.pVal[i] = (U.pVal[i + WordShift] >> BitShift) |
(U.pVal[i + WordShift + 1] << (APINT_BITS_PER_WORD - BitShift));

// Handle the last word which has no high bits to copy.
U.pVal[WordsToMove - 1] = U.pVal[WordShift + WordsToMove - 1] >> BitShift;
// Sign extend one more time.
// Handle the last word which has no high bits to copy. Use an arithmetic
// shift to preserve the sign bit.
U.pVal[WordsToMove - 1] =
SignExtend64(U.pVal[WordsToMove - 1], APINT_BITS_PER_WORD - BitShift);
(int64_t)U.pVal[WordShift + WordsToMove - 1] >> BitShift;
}
}

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