diff options
| -rw-r--r-- | include/llvm/ADT/APInt.h | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h index b39cf78b98..25ea4a2bd5 100644 --- a/include/llvm/ADT/APInt.h +++ b/include/llvm/ADT/APInt.h @@ -374,11 +374,12 @@ public: // Handle a degenerate case, to avoid shifting by word size if (loBitsSet == 0) return APInt(numBits, 0); - uint32_t shiftAmt = numBits - loBitsSet; + if (loBitsSet == APINT_BITS_PER_WORD) + return APInt(numBits, -1ULL); // For small values, return quickly - if (numBits <= APINT_BITS_PER_WORD) - return APInt(numBits, ~0ULL >> shiftAmt); - return (~APInt(numBits, 0)).lshr(shiftAmt); + if (numBits < APINT_BITS_PER_WORD) + return APInt(numBits, (1ULL << loBitsSet) - 1); + return (~APInt(numBits, 0)).lshr(numBits - loBitsSet); } /// The hash value is computed as the sum of the words and the bit width. |