Fix APInt::countTrailingZeros to return BitWidth if the input is zero instead of returning some random large number.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APInt.cpp b/lib/Support/APInt.cpp
index c5abf4b..7af0101 100644
--- a/lib/Support/APInt.cpp
+++ b/lib/Support/APInt.cpp
@@ -782,14 +782,14 @@
uint32_t APInt::countTrailingZeros() const {
if (isSingleWord())
- return CountTrailingZeros_64(VAL);
+ return std::min(CountTrailingZeros_64(VAL), BitWidth);
uint32_t Count = 0;
uint32_t i = 0;
for (; i < getNumWords() && pVal[i] == 0; ++i)
Count += APINT_BITS_PER_WORD;
if (i < getNumWords())
Count += CountTrailingZeros_64(pVal[i]);
- return Count;
+ return std::min(Count, BitWidth);
}
uint32_t APInt::countPopulation() const {