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Implement the getBitsSet function.

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llvm-svn: 35310
This commit is contained in:
Reid Spencer 2007-03-24 23:27:48 +00:00
parent 4887aba89f
commit 0e466b183f
1 changed files with 10 additions and 1 deletions
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11
include/llvm/ADT/APInt.h
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@ -340,7 +340,16 @@ public:
/// @param loBit the index of the lowest 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 hiBit, uint32_t loBit = 0);
static APInt getBitsSet(uint32_t numBits, uint32_t hiBit, uint32_t loBit = 0){
assert(hiBit < numBits && "hiBit out of range");
assert(loBit < numBits && "loBit out of range");
if (hiBit < loBit)
return getLowBitsSet(numBits, hiBit+1) |
getHighBitsSet(numBits, numBits-loBit+1);
else if (loBit == 0)
return getLowBitsSet(numBits, hiBit+1);
return getLowBitsSet(numBits, hiBit-loBit+1).shl(loBit);
}
/// Constructs an APInt value that has the top hiBitsSet bits set.
/// @param numBits the bitwidth of the result