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Change APInt::getBitsSet to accept a "half-open" range, where the

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hiBit parameter marks the index one past the last desired set bit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47032 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-02-12 21:47:33 +00:00
parent caf4fbd5df
commit ffe3e2514a
1 changed files with 7 additions and 7 deletions
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14
include/llvm/ADT/APInt.h
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@ -370,22 +370,22 @@ public:
APInt getLoBits(uint32_t numBits) const;
/// Constructs an APInt value that has a contiguous range of bits set. The
/// bits from loBit to hiBit will be set. All other bits will be zero. For
/// example, with parameters(32, 0, 15) you would get 0x0000FFFF. If hiBit is
/// less than loBit then the set bits "wrap". For example, with
/// parameters (32, 28, 3), you would get 0xF000000F.
/// bits from loBit (inclusive) to hiBit (exclusive) will be set. All other
/// bits will be zero. For example, with parameters(32, 0, 16) you would get
/// 0x0000FFFF. If hiBit is less than loBit then the set bits "wrap". For
/// example, with parameters (32, 28, 4), you would get 0xF000000F.
/// @param numBits the intended bit width of the result
/// @param loBit the index of the lowest bit set.
/// @param hiBit the index of the highest bit set.
/// @returns An APInt value with the requested bits set.
/// @brief Get a value with a block of bits set.
static APInt getBitsSet(uint32_t numBits, uint32_t loBit, uint32_t hiBit) {
assert(hiBit < numBits && "hiBit out of range");
assert(hiBit <= numBits && "hiBit out of range");
assert(loBit < numBits && "loBit out of range");
if (hiBit < loBit)
return getLowBitsSet(numBits, hiBit+1) |
return getLowBitsSet(numBits, hiBit) |
getHighBitsSet(numBits, numBits-loBit);
return getLowBitsSet(numBits, hiBit-loBit+1).shl(loBit);
return getLowBitsSet(numBits, hiBit-loBit).shl(loBit);
}
/// Constructs an APInt value that has the top hiBitsSet bits set.