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Handle more cases in APInt::getLowBitsSet's fast path.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-11-28 16:56:38 +00:00
parent 64acc57b23
commit 39a2eb7dea
1 changed files with 2 additions and 2 deletions
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4
include/llvm/ADT/APInt.h
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@ -497,8 +497,8 @@ public:
if (loBitsSet == APINT_BITS_PER_WORD)
return APInt(numBits, -1ULL);
// For small values, return quickly.
if (numBits < APINT_BITS_PER_WORD)
return APInt(numBits, (1ULL << loBitsSet) - 1);
if (loBitsSet <= APINT_BITS_PER_WORD)
return APInt(numBits, -1ULL >> (APINT_BITS_PER_WORD - loBitsSet));
return getAllOnesValue(numBits).lshr(numBits - loBitsSet);
}