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Fix countLeadingZeros to actually return the correct number.

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Fix toString to correctly return "0" for zero valued APInts over 128 bits.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34459 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-02-21 00:29:48 +00:00
parent 54362ca095
commit e549c4940c
1 changed files with 13 additions and 11 deletions
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24
lib/Support/APInt.cpp
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@ -696,18 +696,20 @@ bool APInt::isPowerOf2() const {
/// the number of zeros from the most significant bit to the first one bit. /// the number of zeros from the most significant bit to the first one bit.
/// @returns numWord() * 64 if the value is zero. /// @returns numWord() * 64 if the value is zero.
uint32_t APInt::countLeadingZeros() const { uint32_t APInt::countLeadingZeros() const {
if (isSingleWord())
return CountLeadingZeros_64(VAL) - (APINT_BITS_PER_WORD - BitWidth);
uint32_t Count = 0; uint32_t Count = 0;
for (uint32_t i = getNumWords(); i > 0u; --i) { if (isSingleWord())
uint32_t tmp = CountLeadingZeros_64(pVal[i-1]); Count = CountLeadingZeros_64(VAL);
Count += tmp; else {
if (tmp != APINT_BITS_PER_WORD) for (uint32_t i = getNumWords(); i > 0u; --i) {
if (i == getNumWords()) if (pVal[i-1] == 0)
Count -= (APINT_BITS_PER_WORD - whichBit(BitWidth)); Count += APINT_BITS_PER_WORD;
break; else {
Count += CountLeadingZeros_64(pVal[i-1]);
break;
}
}
} }
return Count; return Count - (APINT_BITS_PER_WORD - (BitWidth % APINT_BITS_PER_WORD));
} }
/// countTrailingZeros - This function is a APInt version corresponding to /// countTrailingZeros - This function is a APInt version corresponding to
@ -1513,7 +1515,7 @@ std::string APInt::toString(uint8_t radix, bool wantSigned) const {
result = "-"; result = "-";
insert_at = 1; insert_at = 1;
} }
if (tmp == 0) if (tmp == APInt(tmp.getBitWidth(), 0))
result = "0"; result = "0";
else while (tmp.ne(zero)) { else while (tmp.ne(zero)) {
APInt APdigit(1,0); APInt APdigit(1,0);