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1. Use APINT_WORD_SIZE instead of sizeof(uint64_t) 

2. Teach slt about signedness.
3. Teach roundToDouble to properly sign extend.

llvm-svn: 34391
This commit is contained in:
Reid Spencer 2007-02-18 20:09:41 +00:00
parent 68b6184884
commit be4ddf6856
1 changed files with 59 additions and 42 deletions
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101
llvm/lib/Support/APInt.cpp
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@ -59,12 +59,12 @@ APInt::APInt(uint32_t numBits, uint32_t numWords, uint64_t bigVal[])
// Calculate the actual length of bigVal[].
uint32_t maxN = std::max<uint32_t>(numWords, getNumWords());
uint32_t minN = std::min<uint32_t>(numWords, getNumWords());
memcpy(pVal, bigVal, (minN - 1) * sizeof(uint64_t));
memcpy(pVal, bigVal, (minN - 1) * APINT_WORD_SIZE);
pVal[minN-1] = bigVal[minN-1] &
(~uint64_t(0ULL) >>
(APINT_BITS_PER_WORD - BitWidth % APINT_BITS_PER_WORD));
if (maxN == getNumWords())
memset(pVal+numWords, 0, (getNumWords() - numWords) * sizeof(uint64_t));
memset(pVal+numWords, 0, (getNumWords() - numWords) * APINT_WORD_SIZE);
}
}
@ -82,13 +82,14 @@ APInt::APInt(uint32_t numbits, const std::string& Val, uint8_t radix) {
fromString(numbits, Val.c_str(), Val.size(), radix);
}
/// @brief Copy constructor
APInt::APInt(const APInt& APIVal)
: BitWidth(APIVal.BitWidth) {
if (isSingleWord())
VAL = APIVal.VAL;
else {
pVal = getMemory(getNumWords());
memcpy(pVal, APIVal.pVal, getNumWords() * sizeof(uint64_t));
memcpy(pVal, APIVal.pVal, getNumWords() * APINT_WORD_SIZE);
}
}
@ -103,7 +104,7 @@ APInt& APInt::operator=(const APInt& RHS) {
if (isSingleWord())
VAL = RHS.VAL;
else
memcpy(pVal, RHS.pVal, getNumWords() * sizeof(uint64_t));
memcpy(pVal, RHS.pVal, getNumWords() * APINT_WORD_SIZE);
return *this;
}
@ -114,7 +115,7 @@ APInt& APInt::operator=(uint64_t RHS) {
VAL = RHS;
else {
pVal[0] = RHS;
memset(pVal+1, 0, (getNumWords() - 1) * sizeof(uint64_t));
memset(pVal+1, 0, (getNumWords() - 1) * APINT_WORD_SIZE);
}
return *this;
}
@ -339,13 +340,13 @@ APInt& APInt::operator*=(const APInt& RHS) {
first = RHS.getActiveBits();
uint32_t ylen = !first ? 0 : whichWord(first - 1) + 1;
if (!ylen) {
memset(pVal, 0, getNumWords() * sizeof(uint64_t));
memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
return *this;
}
uint64_t *dest = getMemory(xlen+ylen);
mul(dest, pVal, xlen, RHS.pVal, ylen);
memcpy(pVal, dest, ((xlen + ylen >= getNumWords()) ?
getNumWords() : xlen + ylen) * sizeof(uint64_t));
getNumWords() : xlen + ylen) * APINT_WORD_SIZE);
delete[] dest;
}
}
@ -536,23 +537,35 @@ bool APInt::ult(const APInt& RHS) const {
/// @brief Signed less than comparison
bool APInt::slt(const APInt& RHS) const {
assert(BitWidth == RHS.BitWidth && "Bit widths must be same for comparison");
if (isSingleWord())
return VAL < RHS.VAL;
else {
uint32_t n1 = getActiveBits();
uint32_t n2 = RHS.getActiveBits();
if (n1 < n2)
return true;
else if (n2 < n1)
return false;
else if (n1 <= APINT_BITS_PER_WORD && n2 <= APINT_BITS_PER_WORD)
return pVal[0] < RHS.pVal[0];
for (int i = whichWord(n1 - 1); i >= 0; --i) {
if (pVal[i] > RHS.pVal[i]) return false;
else if (pVal[i] < RHS.pVal[i]) return true;
}
if (isSingleWord()) {
int64_t lhsSext = (int64_t(VAL) << (64-BitWidth)) >> (64-BitWidth);
int64_t rhsSext = (int64_t(RHS.VAL) << (64-BitWidth)) >> (64-BitWidth);
return lhsSext < rhsSext;
}
return false;
APInt lhs(*this);
APInt rhs(*this);
bool lhsNegative = false;
bool rhsNegative = false;
if (lhs[BitWidth-1]) {
lhsNegative = true;
lhs.flip();
lhs++;
}
if (rhs[BitWidth-1]) {
rhsNegative = true;
rhs.flip();
rhs++;
}
if (lhsNegative)
if (rhsNegative)
return !lhs.ult(rhs);
else
return true;
else if (rhsNegative)
return false;
else
return lhs.ult(rhs);
}
/// Set the given bit to 1 whose poition is given as "bitPosition".
@ -591,7 +604,7 @@ APInt& APInt::clear() {
if (isSingleWord())
VAL = 0;
else
memset(pVal, 0, getNumWords() * sizeof(uint64_t));
memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
return *this;
}
@ -801,10 +814,10 @@ APInt APInt::byteSwap() const {
else {
APInt Result(BitWidth, 0);
char *pByte = (char*)Result.pVal;
for (uint32_t i = 0; i < BitWidth / sizeof(uint64_t) / 2; ++i) {
for (uint32_t i = 0; i < BitWidth / APINT_WORD_SIZE / 2; ++i) {
char Tmp = pByte[i];
pByte[i] = pByte[BitWidth / sizeof(uint64_t) - 1 - i];
pByte[BitWidth / sizeof(uint64_t) - i - 1] = Tmp;
pByte[i] = pByte[BitWidth / APINT_WORD_SIZE - 1 - i];
pByte[BitWidth / APINT_WORD_SIZE - i - 1] = Tmp;
}
return Result;
}
@ -852,13 +865,17 @@ APInt llvm::APIntOps::RoundDoubleToAPInt(double Double) {
/// | 1[63] 11[62-52] 52[51-00] 1023 |
/// --------------------------------------
double APInt::roundToDouble(bool isSigned) const {
if (isSingleWord() || getActiveBits() <= APINT_BITS_PER_WORD) {
if (isSigned) {
int64_t sext = (int64_t(VAL) << (64-BitWidth)) >> (64-BitWidth);
return double(sext);
} else
return double(VAL);
}
bool isNeg = isSigned ? (*this)[BitWidth-1] : false;
APInt Tmp(isNeg ? -(*this) : (*this));
if (Tmp.isSingleWord())
return isSigned ? double(int64_t(Tmp.VAL)) : double(Tmp.VAL);
uint32_t n = Tmp.getActiveBits();
if (n <= APINT_BITS_PER_WORD)
return isSigned ? double(int64_t(Tmp.pVal[0])) : double(Tmp.pVal[0]);
// Exponent when normalized to have decimal point directly after
// leading one. This is stored excess 1023 in the exponent bit field.
uint64_t exp = n - 1;
@ -914,7 +931,7 @@ APInt APInt::ashr(uint32_t shiftAmt) const {
else {
if (shiftAmt >= API.BitWidth) {
memset(API.pVal, API[API.BitWidth-1] ? 1 : 0,
(API.getNumWords()-1) * sizeof(uint64_t));
(API.getNumWords()-1) * APINT_WORD_SIZE);
API.pVal[API.getNumWords() - 1] =
~uint64_t(0UL) >>
(APINT_BITS_PER_WORD - API.BitWidth % APINT_BITS_PER_WORD);
@ -942,7 +959,7 @@ APInt APInt::lshr(uint32_t shiftAmt) const {
API.VAL >>= shiftAmt;
else {
if (shiftAmt >= API.BitWidth)
memset(API.pVal, 0, API.getNumWords() * sizeof(uint64_t));
memset(API.pVal, 0, API.getNumWords() * APINT_WORD_SIZE);
uint32_t i = 0;
for (i = 0; i < API.BitWidth - shiftAmt; ++i)
if (API[i+shiftAmt]) API.set(i);
@ -960,12 +977,12 @@ APInt APInt::shl(uint32_t shiftAmt) const {
if (API.isSingleWord())
API.VAL <<= shiftAmt;
else if (shiftAmt >= API.BitWidth)
memset(API.pVal, 0, API.getNumWords() * sizeof(uint64_t));
memset(API.pVal, 0, API.getNumWords() * APINT_WORD_SIZE);
else {
if (uint32_t offset = shiftAmt / APINT_BITS_PER_WORD) {
for (uint32_t i = API.getNumWords() - 1; i > offset - 1; --i)
API.pVal[i] = API.pVal[i-offset];
memset(API.pVal, 0, offset * sizeof(uint64_t));
memset(API.pVal, 0, offset * APINT_WORD_SIZE);
}
shiftAmt %= APINT_BITS_PER_WORD;
uint32_t i;
@ -1094,10 +1111,10 @@ APInt APInt::udiv(const APInt& RHS) const {
return Result; // 0 / X == 0
else if (lhsWords < rhsWords || Result.ult(RHS))
// X / Y with X < Y == 0
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
else if (Result == RHS) {
// X / X == 1
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
Result.pVal[0] = 1;
} else if (lhsWords == 1)
// All high words are zero, just use native divide
@ -1115,9 +1132,9 @@ APInt APInt::udiv(const APInt& RHS) const {
}
div((uint32_t*)X.pVal, lhsWords * 2 - 1,
(uint32_t*)(Y.isSingleWord()? &Y.VAL : Y.pVal), rhsWords*2);
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
memcpy(Result.pVal, X.pVal + rhsWords,
(lhsWords - rhsWords) * sizeof(uint64_t));
(lhsWords - rhsWords) * APINT_WORD_SIZE);
}
return Result;
}
@ -1146,13 +1163,13 @@ APInt APInt::urem(const APInt& RHS) const {
// Check the degenerate cases
if (lhsWords == 0)
// 0 % Y == 0
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
else if (lhsWords < rhsWords || Result.ult(RHS))
// X % Y == X iff X < Y
return Result;
else if (Result == RHS)
// X % X == 0;
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
else if (lhsWords == 1)
// All high words are zero, just use native remainder
Result.pVal[0] %= RHS.pVal[0];
@ -1168,7 +1185,7 @@ APInt APInt::urem(const APInt& RHS) const {
}
div((uint32_t*)X.pVal, rhsWords*2-1,
(uint32_t*)(Y.isSingleWord()? &Y.VAL : Y.pVal), rhsWords*2);
memset(Result.pVal, 0, Result.getNumWords() * sizeof(uint64_t));
memset(Result.pVal, 0, Result.getNumWords() * APINT_WORD_SIZE);
for (uint32_t i = 0; i < rhsWords-1; ++i)
Result.pVal[i] = (X.pVal[i] >> nshift) |
(X.pVal[i+1] << (APINT_BITS_PER_WORD - nshift));