/// @brief Get a value with high bits set
static APInt getHighBitsSet(uint32_t numBits, uint32_t hiBitsSet) {
assert(hiBitsSet <= numBits && "Too many bits to set!");
- uint32_t mvBits = numBits - hiBitsSet;
+ uint32_t shiftAmt = numBits - hiBitsSet;
// For small values, return quickly
if (numBits <= APINT_BITS_PER_WORD)
- return APInt(numBits, ((1ULL << hiBitsSet) - 1) << mvBits);
- APInt Result(numBits, 1);
- return (APInt(numBits, 1).shl(hiBitsSet) - APInt(numBits, 1)).shl(mvBits);
+ return APInt(numBits, ~0ULL << shiftAmt);
+ return (~APInt(numBits, 0)).shl(shiftAmt);
}
/// Constructs an APInt value that has the bottom loBitsSet bits set.
/// @brief Get a value with low bits set
static APInt getLowBitsSet(uint32_t numBits, uint32_t loBitsSet) {
assert(loBitsSet <= numBits && "Too many bits to set!");
+ uint32_t shiftAmt = numBits - loBitsSet;
// For small values, return quickly
if (numBits <= APINT_BITS_PER_WORD)
- return APInt(numBits, (1ULL << loBitsSet) - 1ULL);
- return APInt(numBits, 1).shl(loBitsSet) - APInt(numBits, 1);
+ return APInt(numBits, ~0ULL >> shiftAmt);
+ return (~APInt(numBits, 0)).lshr(shiftAmt);
}
/// The hash value is computed as the sum of the words and the bit width.