//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Sheng Zhou and is distributed under the
-// University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
#define DEBUG_TYPE "apint"
#include "llvm/ADT/APInt.h"
-#include "llvm/DerivedTypes.h"
+#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
-#include <math.h>
+#include "llvm/Support/raw_ostream.h"
+#include <cmath>
#include <limits>
#include <cstring>
#include <cstdlib>
-#ifndef NDEBUG
-#include <iomanip>
-#endif
-
using namespace llvm;
/// A utility function for allocating memory, checking for allocation failures,
/// and ensuring the contents are zeroed.
-inline static uint64_t* getClearedMemory(uint32_t numWords) {
+inline static uint64_t* getClearedMemory(unsigned numWords) {
uint64_t * result = new uint64_t[numWords];
assert(result && "APInt memory allocation fails!");
memset(result, 0, numWords * sizeof(uint64_t));
/// A utility function for allocating memory and checking for allocation
/// failure. The content is not zeroed.
-inline static uint64_t* getMemory(uint32_t numWords) {
+inline static uint64_t* getMemory(unsigned numWords) {
uint64_t * result = new uint64_t[numWords];
assert(result && "APInt memory allocation fails!");
return result;
}
-APInt::APInt(uint32_t numBits, uint64_t val, bool isSigned)
- : BitWidth(numBits), VAL(0) {
- assert(BitWidth >= IntegerType::MIN_INT_BITS && "bitwidth too small");
- assert(BitWidth <= IntegerType::MAX_INT_BITS && "bitwidth too large");
- if (isSingleWord())
- VAL = val;
- else {
- pVal = getClearedMemory(getNumWords());
- pVal[0] = val;
- if (isSigned && int64_t(val) < 0)
- for (unsigned i = 1; i < getNumWords(); ++i)
- pVal[i] = -1ULL;
- }
- clearUnusedBits();
+void APInt::initSlowCase(unsigned numBits, uint64_t val, bool isSigned) {
+ pVal = getClearedMemory(getNumWords());
+ pVal[0] = val;
+ if (isSigned && int64_t(val) < 0)
+ for (unsigned i = 1; i < getNumWords(); ++i)
+ pVal[i] = -1ULL;
+}
+
+void APInt::initSlowCase(const APInt& that) {
+ pVal = getMemory(getNumWords());
+ memcpy(pVal, that.pVal, getNumWords() * APINT_WORD_SIZE);
}
-APInt::APInt(uint32_t numBits, uint32_t numWords, uint64_t bigVal[])
- : BitWidth(numBits), VAL(0) {
- assert(BitWidth >= IntegerType::MIN_INT_BITS && "bitwidth too small");
- assert(BitWidth <= IntegerType::MAX_INT_BITS && "bitwidth too large");
+
+APInt::APInt(unsigned numBits, unsigned numWords, const uint64_t bigVal[])
+ : BitWidth(numBits), VAL(0) {
+ assert(BitWidth && "bitwidth too small");
assert(bigVal && "Null pointer detected!");
if (isSingleWord())
VAL = bigVal[0];
// Get memory, cleared to 0
pVal = getClearedMemory(getNumWords());
// Calculate the number of words to copy
- uint32_t words = std::min<uint32_t>(numWords, getNumWords());
+ unsigned words = std::min<unsigned>(numWords, getNumWords());
// Copy the words from bigVal to pVal
memcpy(pVal, bigVal, words * APINT_WORD_SIZE);
}
clearUnusedBits();
}
-APInt::APInt(uint32_t numbits, const char StrStart[], uint32_t slen,
+APInt::APInt(unsigned numbits, const char StrStart[], unsigned slen,
uint8_t radix)
: BitWidth(numbits), VAL(0) {
- assert(BitWidth >= IntegerType::MIN_INT_BITS && "bitwidth too small");
- assert(BitWidth <= IntegerType::MAX_INT_BITS && "bitwidth too large");
+ assert(BitWidth && "bitwidth too small");
fromString(numbits, StrStart, slen, radix);
}
-APInt::APInt(uint32_t numbits, const std::string& Val, uint8_t radix)
- : BitWidth(numbits), VAL(0) {
- assert(BitWidth >= IntegerType::MIN_INT_BITS && "bitwidth too small");
- assert(BitWidth <= IntegerType::MAX_INT_BITS && "bitwidth too large");
- assert(!Val.empty() && "String empty?");
- fromString(numbits, Val.c_str(), Val.size(), radix);
-}
-
-APInt::APInt(const APInt& that)
- : BitWidth(that.BitWidth), VAL(0) {
- assert(BitWidth >= IntegerType::MIN_INT_BITS && "bitwidth too small");
- assert(BitWidth <= IntegerType::MAX_INT_BITS && "bitwidth too large");
- if (isSingleWord())
- VAL = that.VAL;
- else {
- pVal = getMemory(getNumWords());
- memcpy(pVal, that.pVal, getNumWords() * APINT_WORD_SIZE);
- }
-}
-
-APInt::~APInt() {
- if (!isSingleWord() && pVal)
- delete [] pVal;
-}
-
-APInt& APInt::operator=(const APInt& RHS) {
+APInt& APInt::AssignSlowCase(const APInt& RHS) {
// Don't do anything for X = X
if (this == &RHS)
return *this;
- // If the bitwidths are the same, we can avoid mucking with memory
if (BitWidth == RHS.getBitWidth()) {
- if (isSingleWord())
- VAL = RHS.VAL;
- else
- memcpy(pVal, RHS.pVal, getNumWords() * APINT_WORD_SIZE);
+ // assume same bit-width single-word case is already handled
+ assert(!isSingleWord());
+ memcpy(pVal, RHS.pVal, getNumWords() * APINT_WORD_SIZE);
return *this;
}
- if (isSingleWord())
- if (RHS.isSingleWord())
- VAL = RHS.VAL;
- else {
- VAL = 0;
- pVal = getMemory(RHS.getNumWords());
- memcpy(pVal, RHS.pVal, RHS.getNumWords() * APINT_WORD_SIZE);
- }
- else if (getNumWords() == RHS.getNumWords())
+ if (isSingleWord()) {
+ // assume case where both are single words is already handled
+ assert(!RHS.isSingleWord());
+ VAL = 0;
+ pVal = getMemory(RHS.getNumWords());
+ memcpy(pVal, RHS.pVal, RHS.getNumWords() * APINT_WORD_SIZE);
+ } else if (getNumWords() == RHS.getNumWords())
memcpy(pVal, RHS.pVal, RHS.getNumWords() * APINT_WORD_SIZE);
else if (RHS.isSingleWord()) {
delete [] pVal;
return clearUnusedBits();
}
+/// Profile - This method 'profiles' an APInt for use with FoldingSet.
+void APInt::Profile(FoldingSetNodeID& ID) const {
+ ID.AddInteger(BitWidth);
+
+ if (isSingleWord()) {
+ ID.AddInteger(VAL);
+ return;
+ }
+
+ unsigned NumWords = getNumWords();
+ for (unsigned i = 0; i < NumWords; ++i)
+ ID.AddInteger(pVal[i]);
+}
+
/// add_1 - This function adds a single "digit" integer, y, to the multiple
/// "digit" integer array, x[]. x[] is modified to reflect the addition and
/// 1 is returned if there is a carry out, otherwise 0 is returned.
/// @returns the carry of the addition.
-static bool add_1(uint64_t dest[], uint64_t x[], uint32_t len, uint64_t y) {
- for (uint32_t i = 0; i < len; ++i) {
+static bool add_1(uint64_t dest[], uint64_t x[], unsigned len, uint64_t y) {
+ for (unsigned i = 0; i < len; ++i) {
dest[i] = y + x[i];
if (dest[i] < y)
y = 1; // Carry one to next digit.
/// is 1 if "borrowing" exhausted the digits in x, or 0 if x was not exhausted.
/// In other words, if y > x then this function returns 1, otherwise 0.
/// @returns the borrow out of the subtraction
-static bool sub_1(uint64_t x[], uint32_t len, uint64_t y) {
- for (uint32_t i = 0; i < len; ++i) {
+static bool sub_1(uint64_t x[], unsigned len, uint64_t y) {
+ for (unsigned i = 0; i < len; ++i) {
uint64_t X = x[i];
x[i] -= y;
if (y > X)
/// @returns the carry out from the addition
/// @brief General addition of 64-bit integer arrays
static bool add(uint64_t *dest, const uint64_t *x, const uint64_t *y,
- uint32_t len) {
+ unsigned len) {
bool carry = false;
- for (uint32_t i = 0; i< len; ++i) {
+ for (unsigned i = 0; i< len; ++i) {
uint64_t limit = std::min(x[i],y[i]); // must come first in case dest == x
dest[i] = x[i] + y[i] + carry;
carry = dest[i] < limit || (carry && dest[i] == limit);
/// @returns returns the borrow out.
/// @brief Generalized subtraction of 64-bit integer arrays.
static bool sub(uint64_t *dest, const uint64_t *x, const uint64_t *y,
- uint32_t len) {
+ unsigned len) {
bool borrow = false;
- for (uint32_t i = 0; i < len; ++i) {
+ for (unsigned i = 0; i < len; ++i) {
uint64_t x_tmp = borrow ? x[i] - 1 : x[i];
borrow = y[i] > x_tmp || (borrow && x[i] == 0);
dest[i] = x_tmp - y[i];
/// into dest.
/// @returns the carry out of the multiplication.
/// @brief Multiply a multi-digit APInt by a single digit (64-bit) integer.
-static uint64_t mul_1(uint64_t dest[], uint64_t x[], uint32_t len, uint64_t y) {
+static uint64_t mul_1(uint64_t dest[], uint64_t x[], unsigned len, uint64_t y) {
// Split y into high 32-bit part (hy) and low 32-bit part (ly)
uint64_t ly = y & 0xffffffffULL, hy = y >> 32;
uint64_t carry = 0;
// For each digit of x.
- for (uint32_t i = 0; i < len; ++i) {
+ for (unsigned i = 0; i < len; ++i) {
// Split x into high and low words
uint64_t lx = x[i] & 0xffffffffULL;
uint64_t hx = x[i] >> 32;
/// Multiplies integer array x by integer array y and stores the result into
/// the integer array dest. Note that dest's size must be >= xlen + ylen.
/// @brief Generalized multiplicate of integer arrays.
-static void mul(uint64_t dest[], uint64_t x[], uint32_t xlen, uint64_t y[],
- uint32_t ylen) {
+static void mul(uint64_t dest[], uint64_t x[], unsigned xlen, uint64_t y[],
+ unsigned ylen) {
dest[xlen] = mul_1(dest, x, xlen, y[0]);
- for (uint32_t i = 1; i < ylen; ++i) {
+ for (unsigned i = 1; i < ylen; ++i) {
uint64_t ly = y[i] & 0xffffffffULL, hy = y[i] >> 32;
uint64_t carry = 0, lx = 0, hx = 0;
- for (uint32_t j = 0; j < xlen; ++j) {
+ for (unsigned j = 0; j < xlen; ++j) {
lx = x[j] & 0xffffffffULL;
hx = x[j] >> 32;
// hasCarry - A flag to indicate if has carry.
}
// Get some bit facts about LHS and check for zero
- uint32_t lhsBits = getActiveBits();
- uint32_t lhsWords = !lhsBits ? 0 : whichWord(lhsBits - 1) + 1;
+ unsigned lhsBits = getActiveBits();
+ unsigned lhsWords = !lhsBits ? 0 : whichWord(lhsBits - 1) + 1;
if (!lhsWords)
// 0 * X ===> 0
return *this;
// Get some bit facts about RHS and check for zero
- uint32_t rhsBits = RHS.getActiveBits();
- uint32_t rhsWords = !rhsBits ? 0 : whichWord(rhsBits - 1) + 1;
+ unsigned rhsBits = RHS.getActiveBits();
+ unsigned rhsWords = !rhsBits ? 0 : whichWord(rhsBits - 1) + 1;
if (!rhsWords) {
// X * 0 ===> 0
clear();
}
// Allocate space for the result
- uint32_t destWords = rhsWords + lhsWords;
+ unsigned destWords = rhsWords + lhsWords;
uint64_t *dest = getMemory(destWords);
// Perform the long multiply
// Copy result back into *this
clear();
- uint32_t wordsToCopy = destWords >= getNumWords() ? getNumWords() : destWords;
+ unsigned wordsToCopy = destWords >= getNumWords() ? getNumWords() : destWords;
memcpy(pVal, dest, wordsToCopy * APINT_WORD_SIZE);
// delete dest array and return
VAL &= RHS.VAL;
return *this;
}
- uint32_t numWords = getNumWords();
- for (uint32_t i = 0; i < numWords; ++i)
+ unsigned numWords = getNumWords();
+ for (unsigned i = 0; i < numWords; ++i)
pVal[i] &= RHS.pVal[i];
return *this;
}
VAL |= RHS.VAL;
return *this;
}
- uint32_t numWords = getNumWords();
- for (uint32_t i = 0; i < numWords; ++i)
+ unsigned numWords = getNumWords();
+ for (unsigned i = 0; i < numWords; ++i)
pVal[i] |= RHS.pVal[i];
return *this;
}
this->clearUnusedBits();
return *this;
}
- uint32_t numWords = getNumWords();
- for (uint32_t i = 0; i < numWords; ++i)
+ unsigned numWords = getNumWords();
+ for (unsigned i = 0; i < numWords; ++i)
pVal[i] ^= RHS.pVal[i];
return clearUnusedBits();
}
-APInt APInt::operator&(const APInt& RHS) const {
- assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
- if (isSingleWord())
- return APInt(getBitWidth(), VAL & RHS.VAL);
-
- uint32_t numWords = getNumWords();
+APInt APInt::AndSlowCase(const APInt& RHS) const {
+ unsigned numWords = getNumWords();
uint64_t* val = getMemory(numWords);
- for (uint32_t i = 0; i < numWords; ++i)
+ for (unsigned i = 0; i < numWords; ++i)
val[i] = pVal[i] & RHS.pVal[i];
return APInt(val, getBitWidth());
}
-APInt APInt::operator|(const APInt& RHS) const {
- assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
- if (isSingleWord())
- return APInt(getBitWidth(), VAL | RHS.VAL);
-
- uint32_t numWords = getNumWords();
+APInt APInt::OrSlowCase(const APInt& RHS) const {
+ unsigned numWords = getNumWords();
uint64_t *val = getMemory(numWords);
- for (uint32_t i = 0; i < numWords; ++i)
+ for (unsigned i = 0; i < numWords; ++i)
val[i] = pVal[i] | RHS.pVal[i];
return APInt(val, getBitWidth());
}
-APInt APInt::operator^(const APInt& RHS) const {
- assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
- if (isSingleWord())
- return APInt(BitWidth, VAL ^ RHS.VAL);
-
- uint32_t numWords = getNumWords();
+APInt APInt::XorSlowCase(const APInt& RHS) const {
+ unsigned numWords = getNumWords();
uint64_t *val = getMemory(numWords);
- for (uint32_t i = 0; i < numWords; ++i)
+ for (unsigned i = 0; i < numWords; ++i)
val[i] = pVal[i] ^ RHS.pVal[i];
// 0^0==1 so clear the high bits in case they got set.
if (isSingleWord())
return !VAL;
- for (uint32_t i = 0; i < getNumWords(); ++i)
+ for (unsigned i = 0; i < getNumWords(); ++i)
if (pVal[i])
return false;
return true;
return Result.clearUnusedBits();
}
-bool APInt::operator[](uint32_t bitPosition) const {
+bool APInt::operator[](unsigned bitPosition) const {
return (maskBit(bitPosition) &
(isSingleWord() ? VAL : pVal[whichWord(bitPosition)])) != 0;
}
-bool APInt::operator==(const APInt& RHS) const {
- assert(BitWidth == RHS.BitWidth && "Comparison requires equal bit widths");
- if (isSingleWord())
- return VAL == RHS.VAL;
-
+bool APInt::EqualSlowCase(const APInt& RHS) const {
// Get some facts about the number of bits used in the two operands.
- uint32_t n1 = getActiveBits();
- uint32_t n2 = RHS.getActiveBits();
+ unsigned n1 = getActiveBits();
+ unsigned n2 = RHS.getActiveBits();
// If the number of bits isn't the same, they aren't equal
if (n1 != n2)
return true;
}
-bool APInt::operator==(uint64_t Val) const {
- if (isSingleWord())
- return VAL == Val;
-
- uint32_t n = getActiveBits();
+bool APInt::EqualSlowCase(uint64_t Val) const {
+ unsigned n = getActiveBits();
if (n <= APINT_BITS_PER_WORD)
return pVal[0] == Val;
else
return VAL < RHS.VAL;
// Get active bit length of both operands
- uint32_t n1 = getActiveBits();
- uint32_t n2 = RHS.getActiveBits();
+ unsigned n1 = getActiveBits();
+ unsigned n2 = RHS.getActiveBits();
// If magnitude of LHS is less than RHS, return true.
if (n1 < n2)
return pVal[0] < RHS.pVal[0];
// Otherwise, compare all words
- uint32_t topWord = whichWord(std::max(n1,n2)-1);
+ unsigned topWord = whichWord(std::max(n1,n2)-1);
for (int i = topWord; i >= 0; --i) {
if (pVal[i] > RHS.pVal[i])
return false;
return lhs.ult(rhs);
}
-APInt& APInt::set(uint32_t bitPosition) {
+APInt& APInt::set(unsigned bitPosition) {
if (isSingleWord())
VAL |= maskBit(bitPosition);
else
return *this;
}
-APInt& APInt::set() {
- if (isSingleWord()) {
- VAL = -1ULL;
- return clearUnusedBits();
- }
-
- // Set all the bits in all the words.
- for (uint32_t i = 0; i < getNumWords(); ++i)
- pVal[i] = -1ULL;
- // Clear the unused ones
- return clearUnusedBits();
-}
-
/// Set the given bit to 0 whose position is given as "bitPosition".
/// @brief Set a given bit to 0.
-APInt& APInt::clear(uint32_t bitPosition) {
+APInt& APInt::clear(unsigned bitPosition) {
if (isSingleWord())
VAL &= ~maskBit(bitPosition);
else
return *this;
}
-/// @brief Set every bit to 0.
-APInt& APInt::clear() {
- if (isSingleWord())
- VAL = 0;
- else
- memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
- return *this;
-}
-
-/// @brief Bitwise NOT operator. Performs a bitwise logical NOT operation on
-/// this APInt.
-APInt APInt::operator~() const {
- APInt Result(*this);
- Result.flip();
- return Result;
-}
-
/// @brief Toggle every bit to its opposite value.
-APInt& APInt::flip() {
- if (isSingleWord()) {
- VAL ^= -1ULL;
- return clearUnusedBits();
- }
- for (uint32_t i = 0; i < getNumWords(); ++i)
- pVal[i] ^= -1ULL;
- return clearUnusedBits();
-}
/// Toggle a given bit to its opposite value whose position is given
/// as "bitPosition".
/// @brief Toggles a given bit to its opposite value.
-APInt& APInt::flip(uint32_t bitPosition) {
+APInt& APInt::flip(unsigned bitPosition) {
assert(bitPosition < BitWidth && "Out of the bit-width range!");
if ((*this)[bitPosition]) clear(bitPosition);
else set(bitPosition);
return *this;
}
-uint32_t APInt::getBitsNeeded(const char* str, uint32_t slen, uint8_t radix) {
+unsigned APInt::getBitsNeeded(const char* str, unsigned slen, uint8_t radix) {
assert(str != 0 && "Invalid value string");
assert(slen > 0 && "Invalid string length");
// Each computation below needs to know if its negative
- uint32_t isNegative = str[0] == '-';
+ unsigned isNegative = str[0] == '-';
if (isNegative) {
slen--;
str++;
// Compute a sufficient number of bits that is always large enough but might
// be too large. This avoids the assertion in the constructor.
- uint32_t sufficient = slen*64/18;
+ unsigned sufficient = slen*64/18;
// Convert to the actual binary value.
APInt tmp(sufficient, str, slen, radix);
return isNegative + tmp.logBase2() + 1;
}
-uint64_t APInt::getHashValue() const {
- // Put the bit width into the low order bits.
- uint64_t hash = BitWidth;
+// From http://www.burtleburtle.net, byBob Jenkins.
+// When targeting x86, both GCC and LLVM seem to recognize this as a
+// rotate instruction.
+#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
+
+// From http://www.burtleburtle.net, by Bob Jenkins.
+#define mix(a,b,c) \
+ { \
+ a -= c; a ^= rot(c, 4); c += b; \
+ b -= a; b ^= rot(a, 6); a += c; \
+ c -= b; c ^= rot(b, 8); b += a; \
+ a -= c; a ^= rot(c,16); c += b; \
+ b -= a; b ^= rot(a,19); a += c; \
+ c -= b; c ^= rot(b, 4); b += a; \
+ }
+
+// From http://www.burtleburtle.net, by Bob Jenkins.
+#define final(a,b,c) \
+ { \
+ c ^= b; c -= rot(b,14); \
+ a ^= c; a -= rot(c,11); \
+ b ^= a; b -= rot(a,25); \
+ c ^= b; c -= rot(b,16); \
+ a ^= c; a -= rot(c,4); \
+ b ^= a; b -= rot(a,14); \
+ c ^= b; c -= rot(b,24); \
+ }
+
+// hashword() was adapted from http://www.burtleburtle.net, by Bob
+// Jenkins. k is a pointer to an array of uint32_t values; length is
+// the length of the key, in 32-bit chunks. This version only handles
+// keys that are a multiple of 32 bits in size.
+static inline uint32_t hashword(const uint64_t *k64, size_t length)
+{
+ const uint32_t *k = reinterpret_cast<const uint32_t *>(k64);
+ uint32_t a,b,c;
+
+ /* Set up the internal state */
+ a = b = c = 0xdeadbeef + (((uint32_t)length)<<2);
+
+ /*------------------------------------------------- handle most of the key */
+ while (length > 3)
+ {
+ a += k[0];
+ b += k[1];
+ c += k[2];
+ mix(a,b,c);
+ length -= 3;
+ k += 3;
+ }
+
+ /*------------------------------------------- handle the last 3 uint32_t's */
+ switch(length) /* all the case statements fall through */
+ {
+ case 3 : c+=k[2];
+ case 2 : b+=k[1];
+ case 1 : a+=k[0];
+ final(a,b,c);
+ case 0: /* case 0: nothing left to add */
+ break;
+ }
+ /*------------------------------------------------------ report the result */
+ return c;
+}
- // Add the sum of the words to the hash.
+// hashword8() was adapted from http://www.burtleburtle.net, by Bob
+// Jenkins. This computes a 32-bit hash from one 64-bit word. When
+// targeting x86 (32 or 64 bit), both LLVM and GCC compile this
+// function into about 35 instructions when inlined.
+static inline uint32_t hashword8(const uint64_t k64)
+{
+ uint32_t a,b,c;
+ a = b = c = 0xdeadbeef + 4;
+ b += k64 >> 32;
+ a += k64 & 0xffffffff;
+ final(a,b,c);
+ return c;
+}
+#undef final
+#undef mix
+#undef rot
+
+uint64_t APInt::getHashValue() const {
+ uint64_t hash;
if (isSingleWord())
- hash += VAL << 6; // clear separation of up to 64 bits
+ hash = hashword8(VAL);
else
- for (uint32_t i = 0; i < getNumWords(); ++i)
- hash += pVal[i] << 6; // clear sepration of up to 64 bits
+ hash = hashword(pVal, getNumWords()*2);
return hash;
}
/// HiBits - This function returns the high "numBits" bits of this APInt.
-APInt APInt::getHiBits(uint32_t numBits) const {
+APInt APInt::getHiBits(unsigned numBits) const {
return APIntOps::lshr(*this, BitWidth - numBits);
}
/// LoBits - This function returns the low "numBits" bits of this APInt.
-APInt APInt::getLoBits(uint32_t numBits) const {
+APInt APInt::getLoBits(unsigned numBits) const {
return APIntOps::lshr(APIntOps::shl(*this, BitWidth - numBits),
BitWidth - numBits);
}
return (!!*this) && !(*this & (*this - APInt(BitWidth,1)));
}
-uint32_t APInt::countLeadingZeros() const {
- uint32_t Count = 0;
- if (isSingleWord())
- Count = CountLeadingZeros_64(VAL);
- else {
- for (uint32_t i = getNumWords(); i > 0u; --i) {
- if (pVal[i-1] == 0)
- Count += APINT_BITS_PER_WORD;
- else {
- Count += CountLeadingZeros_64(pVal[i-1]);
- break;
- }
+unsigned APInt::countLeadingZerosSlowCase() const {
+ unsigned Count = 0;
+ for (unsigned i = getNumWords(); i > 0u; --i) {
+ if (pVal[i-1] == 0)
+ Count += APINT_BITS_PER_WORD;
+ else {
+ Count += CountLeadingZeros_64(pVal[i-1]);
+ break;
}
}
- uint32_t remainder = BitWidth % APINT_BITS_PER_WORD;
+ unsigned remainder = BitWidth % APINT_BITS_PER_WORD;
if (remainder)
Count -= APINT_BITS_PER_WORD - remainder;
- return Count;
+ return std::min(Count, BitWidth);
}
-static uint32_t countLeadingOnes_64(uint64_t V, uint32_t skip) {
- uint32_t Count = 0;
+static unsigned countLeadingOnes_64(uint64_t V, unsigned skip) {
+ unsigned Count = 0;
if (skip)
V <<= skip;
while (V && (V & (1ULL << 63))) {
return Count;
}
-uint32_t APInt::countLeadingOnes() const {
+unsigned APInt::countLeadingOnes() const {
if (isSingleWord())
return countLeadingOnes_64(VAL, APINT_BITS_PER_WORD - BitWidth);
- uint32_t highWordBits = BitWidth % APINT_BITS_PER_WORD;
- uint32_t shift = (highWordBits == 0 ? 0 : APINT_BITS_PER_WORD - highWordBits);
+ unsigned highWordBits = BitWidth % APINT_BITS_PER_WORD;
+ unsigned shift;
+ if (!highWordBits) {
+ highWordBits = APINT_BITS_PER_WORD;
+ shift = 0;
+ } else {
+ shift = APINT_BITS_PER_WORD - highWordBits;
+ }
int i = getNumWords() - 1;
- uint32_t Count = countLeadingOnes_64(pVal[i], shift);
+ unsigned Count = countLeadingOnes_64(pVal[i], shift);
if (Count == highWordBits) {
for (i--; i >= 0; --i) {
if (pVal[i] == -1ULL)
return Count;
}
-uint32_t APInt::countTrailingZeros() const {
+unsigned APInt::countTrailingZeros() const {
if (isSingleWord())
- return CountTrailingZeros_64(VAL);
- uint32_t Count = 0;
- uint32_t i = 0;
+ return std::min(unsigned(CountTrailingZeros_64(VAL)), BitWidth);
+ unsigned Count = 0;
+ unsigned 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 {
- if (isSingleWord())
- return CountPopulation_64(VAL);
- uint32_t Count = 0;
- for (uint32_t i = 0; i < getNumWords(); ++i)
+unsigned APInt::countTrailingOnesSlowCase() const {
+ unsigned Count = 0;
+ unsigned i = 0;
+ for (; i < getNumWords() && pVal[i] == -1ULL; ++i)
+ Count += APINT_BITS_PER_WORD;
+ if (i < getNumWords())
+ Count += CountTrailingOnes_64(pVal[i]);
+ return std::min(Count, BitWidth);
+}
+
+unsigned APInt::countPopulationSlowCase() const {
+ unsigned Count = 0;
+ for (unsigned i = 0; i < getNumWords(); ++i)
Count += CountPopulation_64(pVal[i]);
return Count;
}
if (BitWidth == 16)
return APInt(BitWidth, ByteSwap_16(uint16_t(VAL)));
else if (BitWidth == 32)
- return APInt(BitWidth, ByteSwap_32(uint32_t(VAL)));
+ return APInt(BitWidth, ByteSwap_32(unsigned(VAL)));
else if (BitWidth == 48) {
- uint32_t Tmp1 = uint32_t(VAL >> 16);
+ unsigned Tmp1 = unsigned(VAL >> 16);
Tmp1 = ByteSwap_32(Tmp1);
uint16_t Tmp2 = uint16_t(VAL);
Tmp2 = ByteSwap_16(Tmp2);
else {
APInt Result(BitWidth, 0);
char *pByte = (char*)Result.pVal;
- for (uint32_t i = 0; i < BitWidth / APINT_WORD_SIZE / 2; ++i) {
+ for (unsigned i = 0; i < BitWidth / APINT_WORD_SIZE / 2; ++i) {
char Tmp = pByte[i];
pByte[i] = pByte[BitWidth / APINT_WORD_SIZE - 1 - i];
pByte[BitWidth / APINT_WORD_SIZE - i - 1] = Tmp;
return A;
}
-APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, uint32_t width) {
+APInt llvm::APIntOps::RoundDoubleToAPInt(double Double, unsigned width) {
union {
double D;
uint64_t I;
// Otherwise, we have to shift the mantissa bits up to the right location
APInt Tmp(width, mantissa);
- Tmp = Tmp.shl(exp - 52);
+ Tmp = Tmp.shl((unsigned)exp - 52);
return isNeg ? -Tmp : Tmp;
}
APInt Tmp(isNeg ? -(*this) : (*this));
// Figure out how many bits we're using.
- uint32_t n = Tmp.getActiveBits();
+ unsigned n = Tmp.getActiveBits();
// The exponent (without bias normalization) is just the number of bits
// we are using. Note that the sign bit is gone since we constructed the
}
// Truncate to new width.
-APInt &APInt::trunc(uint32_t width) {
+APInt &APInt::trunc(unsigned width) {
assert(width < BitWidth && "Invalid APInt Truncate request");
- assert(width >= IntegerType::MIN_INT_BITS && "Can't truncate to 0 bits");
- uint32_t wordsBefore = getNumWords();
+ assert(width && "Can't truncate to 0 bits");
+ unsigned wordsBefore = getNumWords();
BitWidth = width;
- uint32_t wordsAfter = getNumWords();
+ unsigned wordsAfter = getNumWords();
if (wordsBefore != wordsAfter) {
if (wordsAfter == 1) {
uint64_t *tmp = pVal;
delete [] tmp;
} else {
uint64_t *newVal = getClearedMemory(wordsAfter);
- for (uint32_t i = 0; i < wordsAfter; ++i)
+ for (unsigned i = 0; i < wordsAfter; ++i)
newVal[i] = pVal[i];
delete [] pVal;
pVal = newVal;
}
// Sign extend to a new width.
-APInt &APInt::sext(uint32_t width) {
+APInt &APInt::sext(unsigned width) {
assert(width > BitWidth && "Invalid APInt SignExtend request");
- assert(width <= IntegerType::MAX_INT_BITS && "Too many bits");
// If the sign bit isn't set, this is the same as zext.
if (!isNegative()) {
zext(width);
}
// The sign bit is set. First, get some facts
- uint32_t wordsBefore = getNumWords();
- uint32_t wordBits = BitWidth % APINT_BITS_PER_WORD;
+ unsigned wordsBefore = getNumWords();
+ unsigned wordBits = BitWidth % APINT_BITS_PER_WORD;
BitWidth = width;
- uint32_t wordsAfter = getNumWords();
+ unsigned wordsAfter = getNumWords();
// Mask the high order word appropriately
if (wordsBefore == wordsAfter) {
- uint32_t newWordBits = width % APINT_BITS_PER_WORD;
+ unsigned newWordBits = width % APINT_BITS_PER_WORD;
// The extension is contained to the wordsBefore-1th word.
uint64_t mask = ~0ULL;
if (newWordBits)
if (wordsBefore == 1)
newVal[0] = VAL | mask;
else {
- for (uint32_t i = 0; i < wordsBefore; ++i)
+ for (unsigned i = 0; i < wordsBefore; ++i)
newVal[i] = pVal[i];
newVal[wordsBefore-1] |= mask;
}
- for (uint32_t i = wordsBefore; i < wordsAfter; i++)
+ for (unsigned i = wordsBefore; i < wordsAfter; i++)
newVal[i] = -1ULL;
if (wordsBefore != 1)
delete [] pVal;
}
// Zero extend to a new width.
-APInt &APInt::zext(uint32_t width) {
+APInt &APInt::zext(unsigned width) {
assert(width > BitWidth && "Invalid APInt ZeroExtend request");
- assert(width <= IntegerType::MAX_INT_BITS && "Too many bits");
- uint32_t wordsBefore = getNumWords();
+ unsigned wordsBefore = getNumWords();
BitWidth = width;
- uint32_t wordsAfter = getNumWords();
+ unsigned wordsAfter = getNumWords();
if (wordsBefore != wordsAfter) {
uint64_t *newVal = getClearedMemory(wordsAfter);
if (wordsBefore == 1)
newVal[0] = VAL;
else
- for (uint32_t i = 0; i < wordsBefore; ++i)
+ for (unsigned i = 0; i < wordsBefore; ++i)
newVal[i] = pVal[i];
if (wordsBefore != 1)
delete [] pVal;
return *this;
}
-APInt &APInt::zextOrTrunc(uint32_t width) {
+APInt &APInt::zextOrTrunc(unsigned width) {
if (BitWidth < width)
return zext(width);
if (BitWidth > width)
return *this;
}
-APInt &APInt::sextOrTrunc(uint32_t width) {
+APInt &APInt::sextOrTrunc(unsigned width) {
if (BitWidth < width)
return sext(width);
if (BitWidth > width)
/// Arithmetic right-shift this APInt by shiftAmt.
/// @brief Arithmetic right-shift function.
-APInt APInt::ashr(uint32_t shiftAmt) const {
+APInt APInt::ashr(const APInt &shiftAmt) const {
+ return ashr((unsigned)shiftAmt.getLimitedValue(BitWidth));
+}
+
+/// Arithmetic right-shift this APInt by shiftAmt.
+/// @brief Arithmetic right-shift function.
+APInt APInt::ashr(unsigned shiftAmt) const {
assert(shiftAmt <= BitWidth && "Invalid shift amount");
// Handle a degenerate case
if (shiftAmt == 0)
if (shiftAmt == BitWidth)
return APInt(BitWidth, 0); // undefined
else {
- uint32_t SignBit = APINT_BITS_PER_WORD - BitWidth;
+ unsigned SignBit = APINT_BITS_PER_WORD - BitWidth;
return APInt(BitWidth,
(((int64_t(VAL) << SignBit) >> SignBit) >> shiftAmt));
}
// issues in the algorithm below.
if (shiftAmt == BitWidth) {
if (isNegative())
- return APInt(BitWidth, -1ULL);
+ return APInt(BitWidth, -1ULL, true);
else
return APInt(BitWidth, 0);
}
uint64_t * val = new uint64_t[getNumWords()];
// Compute some values needed by the following shift algorithms
- uint32_t wordShift = shiftAmt % APINT_BITS_PER_WORD; // bits to shift per word
- uint32_t offset = shiftAmt / APINT_BITS_PER_WORD; // word offset for shift
- uint32_t breakWord = getNumWords() - 1 - offset; // last word affected
- uint32_t bitsInWord = whichBit(BitWidth); // how many bits in last word?
+ unsigned wordShift = shiftAmt % APINT_BITS_PER_WORD; // bits to shift per word
+ unsigned offset = shiftAmt / APINT_BITS_PER_WORD; // word offset for shift
+ unsigned breakWord = getNumWords() - 1 - offset; // last word affected
+ unsigned bitsInWord = whichBit(BitWidth); // how many bits in last word?
if (bitsInWord == 0)
bitsInWord = APINT_BITS_PER_WORD;
// If we are shifting whole words, just move whole words
if (wordShift == 0) {
// Move the words containing significant bits
- for (uint32_t i = 0; i <= breakWord; ++i)
+ for (unsigned i = 0; i <= breakWord; ++i)
val[i] = pVal[i+offset]; // move whole word
// Adjust the top significant word for sign bit fill, if negative
val[breakWord] |= ~0ULL << bitsInWord; // set high bits
} else {
// Shift the low order words
- for (uint32_t i = 0; i < breakWord; ++i) {
+ for (unsigned i = 0; i < breakWord; ++i) {
// This combines the shifted corresponding word with the low bits from
// the next word (shifted into this word's high bits).
val[i] = (pVal[i+offset] >> wordShift) |
// Remaining words are 0 or -1, just assign them.
uint64_t fillValue = (isNegative() ? -1ULL : 0);
- for (uint32_t i = breakWord+1; i < getNumWords(); ++i)
+ for (unsigned i = breakWord+1; i < getNumWords(); ++i)
val[i] = fillValue;
return APInt(val, BitWidth).clearUnusedBits();
}
/// Logical right-shift this APInt by shiftAmt.
/// @brief Logical right-shift function.
-APInt APInt::lshr(uint32_t shiftAmt) const {
+APInt APInt::lshr(const APInt &shiftAmt) const {
+ return lshr((unsigned)shiftAmt.getLimitedValue(BitWidth));
+}
+
+/// Logical right-shift this APInt by shiftAmt.
+/// @brief Logical right-shift function.
+APInt APInt::lshr(unsigned shiftAmt) const {
if (isSingleWord()) {
if (shiftAmt == BitWidth)
return APInt(BitWidth, 0);
return APInt(BitWidth, 0);
// If none of the bits are shifted out, the result is *this. This avoids
- // issues with shifting byt he size of the integer type, which produces
+ // issues with shifting by the size of the integer type, which produces
// undefined results in the code below. This is also an optimization.
if (shiftAmt == 0)
return *this;
}
// Compute some values needed by the remaining shift algorithms
- uint32_t wordShift = shiftAmt % APINT_BITS_PER_WORD;
- uint32_t offset = shiftAmt / APINT_BITS_PER_WORD;
+ unsigned wordShift = shiftAmt % APINT_BITS_PER_WORD;
+ unsigned offset = shiftAmt / APINT_BITS_PER_WORD;
// If we are shifting whole words, just move whole words
if (wordShift == 0) {
- for (uint32_t i = 0; i < getNumWords() - offset; ++i)
+ for (unsigned i = 0; i < getNumWords() - offset; ++i)
val[i] = pVal[i+offset];
- for (uint32_t i = getNumWords()-offset; i < getNumWords(); i++)
+ for (unsigned i = getNumWords()-offset; i < getNumWords(); i++)
val[i] = 0;
return APInt(val,BitWidth).clearUnusedBits();
}
// Shift the low order words
- uint32_t breakWord = getNumWords() - offset -1;
- for (uint32_t i = 0; i < breakWord; ++i)
+ unsigned breakWord = getNumWords() - offset -1;
+ for (unsigned i = 0; i < breakWord; ++i)
val[i] = (pVal[i+offset] >> wordShift) |
(pVal[i+offset+1] << (APINT_BITS_PER_WORD - wordShift));
// Shift the break word.
val[breakWord] = pVal[breakWord+offset] >> wordShift;
// Remaining words are 0
- for (uint32_t i = breakWord+1; i < getNumWords(); ++i)
+ for (unsigned i = breakWord+1; i < getNumWords(); ++i)
val[i] = 0;
return APInt(val, BitWidth).clearUnusedBits();
}
/// Left-shift this APInt by shiftAmt.
/// @brief Left-shift function.
-APInt APInt::shl(uint32_t shiftAmt) const {
- assert(shiftAmt <= BitWidth && "Invalid shift amount");
- if (isSingleWord()) {
- if (shiftAmt == BitWidth)
- return APInt(BitWidth, 0); // avoid undefined shift results
- return APInt(BitWidth, VAL << shiftAmt);
- }
+APInt APInt::shl(const APInt &shiftAmt) const {
+ // It's undefined behavior in C to shift by BitWidth or greater.
+ return shl((unsigned)shiftAmt.getLimitedValue(BitWidth));
+}
+APInt APInt::shlSlowCase(unsigned shiftAmt) const {
// If all the bits were shifted out, the result is 0. This avoids issues
// with shifting by the size of the integer type, which produces undefined
// results. We define these "undefined results" to always be 0.
// If we are shifting less than a word, do it the easy way
if (shiftAmt < APINT_BITS_PER_WORD) {
uint64_t carry = 0;
- for (uint32_t i = 0; i < getNumWords(); i++) {
+ for (unsigned i = 0; i < getNumWords(); i++) {
val[i] = pVal[i] << shiftAmt | carry;
carry = pVal[i] >> (APINT_BITS_PER_WORD - shiftAmt);
}
}
// Compute some values needed by the remaining shift algorithms
- uint32_t wordShift = shiftAmt % APINT_BITS_PER_WORD;
- uint32_t offset = shiftAmt / APINT_BITS_PER_WORD;
+ unsigned wordShift = shiftAmt % APINT_BITS_PER_WORD;
+ unsigned offset = shiftAmt / APINT_BITS_PER_WORD;
// If we are shifting whole words, just move whole words
if (wordShift == 0) {
- for (uint32_t i = 0; i < offset; i++)
+ for (unsigned i = 0; i < offset; i++)
val[i] = 0;
- for (uint32_t i = offset; i < getNumWords(); i++)
+ for (unsigned i = offset; i < getNumWords(); i++)
val[i] = pVal[i-offset];
return APInt(val,BitWidth).clearUnusedBits();
}
// Copy whole words from this to Result.
- uint32_t i = getNumWords() - 1;
+ unsigned i = getNumWords() - 1;
for (; i > offset; --i)
val[i] = pVal[i-offset] << wordShift |
pVal[i-offset-1] >> (APINT_BITS_PER_WORD - wordShift);
return APInt(val, BitWidth).clearUnusedBits();
}
-APInt APInt::rotl(uint32_t rotateAmt) const {
+APInt APInt::rotl(const APInt &rotateAmt) const {
+ return rotl((unsigned)rotateAmt.getLimitedValue(BitWidth));
+}
+
+APInt APInt::rotl(unsigned rotateAmt) const {
if (rotateAmt == 0)
return *this;
// Don't get too fancy, just use existing shift/or facilities
return hi | lo;
}
-APInt APInt::rotr(uint32_t rotateAmt) const {
+APInt APInt::rotr(const APInt &rotateAmt) const {
+ return rotr((unsigned)rotateAmt.getLimitedValue(BitWidth));
+}
+
+APInt APInt::rotr(unsigned rotateAmt) const {
if (rotateAmt == 0)
return *this;
// Don't get too fancy, just use existing shift/or facilities
APInt APInt::sqrt() const {
// Determine the magnitude of the value.
- uint32_t magnitude = getActiveBits();
+ unsigned magnitude = getActiveBits();
// Use a fast table for some small values. This also gets rid of some
// rounding errors in libc sqrt for small values.
// was adapted to APINt from a wikipedia article on such computations.
// See http://www.wikipedia.org/ and go to the page named
// Calculate_an_integer_square_root.
- uint32_t nbits = BitWidth, i = 4;
+ unsigned nbits = BitWidth, i = 4;
APInt testy(BitWidth, 16);
APInt x_old(BitWidth, 1);
APInt x_new(BitWidth, 0);
return x_old + 1;
}
+/// Computes the multiplicative inverse of this APInt for a given modulo. The
+/// iterative extended Euclidean algorithm is used to solve for this value,
+/// however we simplify it to speed up calculating only the inverse, and take
+/// advantage of div+rem calculations. We also use some tricks to avoid copying
+/// (potentially large) APInts around.
+APInt APInt::multiplicativeInverse(const APInt& modulo) const {
+ assert(ult(modulo) && "This APInt must be smaller than the modulo");
+
+ // Using the properties listed at the following web page (accessed 06/21/08):
+ // http://www.numbertheory.org/php/euclid.html
+ // (especially the properties numbered 3, 4 and 9) it can be proved that
+ // BitWidth bits suffice for all the computations in the algorithm implemented
+ // below. More precisely, this number of bits suffice if the multiplicative
+ // inverse exists, but may not suffice for the general extended Euclidean
+ // algorithm.
+
+ APInt r[2] = { modulo, *this };
+ APInt t[2] = { APInt(BitWidth, 0), APInt(BitWidth, 1) };
+ APInt q(BitWidth, 0);
+
+ unsigned i;
+ for (i = 0; r[i^1] != 0; i ^= 1) {
+ // An overview of the math without the confusing bit-flipping:
+ // q = r[i-2] / r[i-1]
+ // r[i] = r[i-2] % r[i-1]
+ // t[i] = t[i-2] - t[i-1] * q
+ udivrem(r[i], r[i^1], q, r[i]);
+ t[i] -= t[i^1] * q;
+ }
+
+ // If this APInt and the modulo are not coprime, there is no multiplicative
+ // inverse, so return 0. We check this by looking at the next-to-last
+ // remainder, which is the gcd(*this,modulo) as calculated by the Euclidean
+ // algorithm.
+ if (r[i] != 1)
+ return APInt(BitWidth, 0);
+
+ // The next-to-last t is the multiplicative inverse. However, we are
+ // interested in a positive inverse. Calcuate a positive one from a negative
+ // one if necessary. A simple addition of the modulo suffices because
+ // abs(t[i]) is known to be less than *this/2 (see the link above).
+ return t[i].isNegative() ? t[i] + modulo : t[i];
+}
+
/// Implementation of Knuth's Algorithm D (Division of nonnegative integers)
/// from "Art of Computer Programming, Volume 2", section 4.3.1, p. 272. The
/// variables here have the same names as in the algorithm. Comments explain
/// the algorithm and any deviation from it.
-static void KnuthDiv(uint32_t *u, uint32_t *v, uint32_t *q, uint32_t* r,
- uint32_t m, uint32_t n) {
+static void KnuthDiv(unsigned *u, unsigned *v, unsigned *q, unsigned* r,
+ unsigned m, unsigned n) {
assert(u && "Must provide dividend");
assert(v && "Must provide divisor");
assert(q && "Must provide quotient");
// is 2^31 so we just set it to -1u.
uint64_t b = uint64_t(1) << 32;
+#if 0
DEBUG(cerr << "KnuthDiv: m=" << m << " n=" << n << '\n');
DEBUG(cerr << "KnuthDiv: original:");
DEBUG(for (int i = m+n; i >=0; i--) cerr << " " << std::setbase(16) << u[i]);
DEBUG(cerr << " by");
DEBUG(for (int i = n; i >0; i--) cerr << " " << std::setbase(16) << v[i-1]);
DEBUG(cerr << '\n');
+#endif
// D1. [Normalize.] Set d = b / (v[n-1] + 1) and multiply all the digits of
// u and v by d. Note that we have taken Knuth's advice here to use a power
// of 2 value for d such that d * v[n-1] >= b/2 (b is the base). A power of
// and v so that its high bits are shifted to the top of v's range without
// overflow. Note that this can require an extra word in u so that u must
// be of length m+n+1.
- uint32_t shift = CountLeadingZeros_32(v[n-1]);
- uint32_t v_carry = 0;
- uint32_t u_carry = 0;
+ unsigned shift = CountLeadingZeros_32(v[n-1]);
+ unsigned v_carry = 0;
+ unsigned u_carry = 0;
if (shift) {
- for (uint32_t i = 0; i < m+n; ++i) {
- uint32_t u_tmp = u[i] >> (32 - shift);
+ for (unsigned i = 0; i < m+n; ++i) {
+ unsigned u_tmp = u[i] >> (32 - shift);
u[i] = (u[i] << shift) | u_carry;
u_carry = u_tmp;
}
- for (uint32_t i = 0; i < n; ++i) {
- uint32_t v_tmp = v[i] >> (32 - shift);
+ for (unsigned i = 0; i < n; ++i) {
+ unsigned v_tmp = v[i] >> (32 - shift);
v[i] = (v[i] << shift) | v_carry;
v_carry = v_tmp;
}
}
u[m+n] = u_carry;
+#if 0
DEBUG(cerr << "KnuthDiv: normal:");
DEBUG(for (int i = m+n; i >=0; i--) cerr << " " << std::setbase(16) << u[i]);
DEBUG(cerr << " by");
DEBUG(for (int i = n; i >0; i--) cerr << " " << std::setbase(16) << v[i-1]);
DEBUG(cerr << '\n');
+#endif
// D2. [Initialize j.] Set j to m. This is the loop counter over the places.
int j = m;
// consists of a simple multiplication by a one-place number, combined with
// a subtraction.
bool isNeg = false;
- for (uint32_t i = 0; i < n; ++i) {
+ for (unsigned i = 0; i < n; ++i) {
uint64_t u_tmp = uint64_t(u[j+i]) | (uint64_t(u[j+i+1]) << 32);
uint64_t subtrahend = uint64_t(qp) * uint64_t(v[i]);
bool borrow = subtrahend > u_tmp;
<< ", borrow = " << borrow << '\n');
uint64_t result = u_tmp - subtrahend;
- uint32_t k = j + i;
- u[k++] = result & (b-1); // subtract low word
- u[k++] = result >> 32; // subtract high word
+ unsigned k = j + i;
+ u[k++] = (unsigned)(result & (b-1)); // subtract low word
+ u[k++] = (unsigned)(result >> 32); // subtract high word
while (borrow && k <= m+n) { // deal with borrow to the left
borrow = u[k] == 0;
u[k]--;
//
if (isNeg) {
bool carry = true; // true because b's complement is "complement + 1"
- for (uint32_t i = 0; i <= m+n; ++i) {
+ for (unsigned i = 0; i <= m+n; ++i) {
u[i] = ~u[i] + carry; // b's complement
carry = carry && u[i] == 0;
}
// D5. [Test remainder.] Set q[j] = qp. If the result of step D4 was
// negative, go to step D6; otherwise go on to step D7.
- q[j] = qp;
+ q[j] = (unsigned)qp;
if (isNeg) {
// D6. [Add back]. The probability that this step is necessary is very
// small, on the order of only 2/b. Make sure that test data accounts for
// A carry will occur to the left of u[j+n], and it should be ignored
// since it cancels with the borrow that occurred in D4.
bool carry = false;
- for (uint32_t i = 0; i < n; i++) {
- uint32_t limit = std::min(u[j+i],v[i]);
+ for (unsigned i = 0; i < n; i++) {
+ unsigned limit = std::min(u[j+i],v[i]);
u[j+i] += v[i] + carry;
carry = u[j+i] < limit || (carry && u[j+i] == limit);
}
// multiplication by d by using a shift left. So, all we have to do is
// shift right here. In order to mak
if (shift) {
- uint32_t carry = 0;
+ unsigned carry = 0;
DEBUG(cerr << "KnuthDiv: remainder:");
for (int i = n-1; i >= 0; i--) {
r[i] = (u[i] >> shift) | carry;
}
DEBUG(cerr << '\n');
}
+#if 0
DEBUG(cerr << std::setbase(10) << '\n');
+#endif
}
-void APInt::divide(const APInt LHS, uint32_t lhsWords,
- const APInt &RHS, uint32_t rhsWords,
+void APInt::divide(const APInt LHS, unsigned lhsWords,
+ const APInt &RHS, unsigned rhsWords,
APInt *Quotient, APInt *Remainder)
{
assert(lhsWords >= rhsWords && "Fractional result");
// and the the Knuth "classical algorithm" which requires there to be native
// operations for +, -, and * on an m bit value with an m*2 bit result. We
// can't use 64-bit operands here because we don't have native results of
- // 128-bits. Furthremore, casting the 64-bit values to 32-bit values won't
+ // 128-bits. Furthermore, casting the 64-bit values to 32-bit values won't
// work on large-endian machines.
- uint64_t mask = ~0ull >> (sizeof(uint32_t)*8);
- uint32_t n = rhsWords * 2;
- uint32_t m = (lhsWords * 2) - n;
+ uint64_t mask = ~0ull >> (sizeof(unsigned)*CHAR_BIT);
+ unsigned n = rhsWords * 2;
+ unsigned m = (lhsWords * 2) - n;
// Allocate space for the temporary values we need either on the stack, if
// it will fit, or on the heap if it won't.
- uint32_t SPACE[128];
- uint32_t *U = 0;
- uint32_t *V = 0;
- uint32_t *Q = 0;
- uint32_t *R = 0;
+ unsigned SPACE[128];
+ unsigned *U = 0;
+ unsigned *V = 0;
+ unsigned *Q = 0;
+ unsigned *R = 0;
if ((Remainder?4:3)*n+2*m+1 <= 128) {
U = &SPACE[0];
V = &SPACE[m+n+1];
if (Remainder)
R = &SPACE[(m+n+1) + n + (m+n)];
} else {
- U = new uint32_t[m + n + 1];
- V = new uint32_t[n];
- Q = new uint32_t[m+n];
+ U = new unsigned[m + n + 1];
+ V = new unsigned[n];
+ Q = new unsigned[m+n];
if (Remainder)
- R = new uint32_t[n];
+ R = new unsigned[n];
}
// Initialize the dividend
- memset(U, 0, (m+n+1)*sizeof(uint32_t));
+ memset(U, 0, (m+n+1)*sizeof(unsigned));
for (unsigned i = 0; i < lhsWords; ++i) {
uint64_t tmp = (LHS.getNumWords() == 1 ? LHS.VAL : LHS.pVal[i]);
- U[i * 2] = tmp & mask;
- U[i * 2 + 1] = tmp >> (sizeof(uint32_t)*8);
+ U[i * 2] = (unsigned)(tmp & mask);
+ U[i * 2 + 1] = (unsigned)(tmp >> (sizeof(unsigned)*CHAR_BIT));
}
U[m+n] = 0; // this extra word is for "spill" in the Knuth algorithm.
// Initialize the divisor
- memset(V, 0, (n)*sizeof(uint32_t));
+ memset(V, 0, (n)*sizeof(unsigned));
for (unsigned i = 0; i < rhsWords; ++i) {
uint64_t tmp = (RHS.getNumWords() == 1 ? RHS.VAL : RHS.pVal[i]);
- V[i * 2] = tmp & mask;
- V[i * 2 + 1] = tmp >> (sizeof(uint32_t)*8);
+ V[i * 2] = (unsigned)(tmp & mask);
+ V[i * 2 + 1] = (unsigned)(tmp >> (sizeof(unsigned)*CHAR_BIT));
}
// initialize the quotient and remainder
- memset(Q, 0, (m+n) * sizeof(uint32_t));
+ memset(Q, 0, (m+n) * sizeof(unsigned));
if (Remainder)
- memset(R, 0, n * sizeof(uint32_t));
+ memset(R, 0, n * sizeof(unsigned));
// Now, adjust m and n for the Knuth division. n is the number of words in
// the divisor. m is the number of words by which the dividend exceeds the
// are using base 2^32 instead of base 10.
assert(n != 0 && "Divide by zero?");
if (n == 1) {
- uint32_t divisor = V[0];
- uint32_t remainder = 0;
+ unsigned divisor = V[0];
+ unsigned remainder = 0;
for (int i = m+n-1; i >= 0; i--) {
uint64_t partial_dividend = uint64_t(remainder) << 32 | U[i];
if (partial_dividend == 0) {
remainder = 0;
} else if (partial_dividend < divisor) {
Q[i] = 0;
- remainder = partial_dividend;
+ remainder = (unsigned)partial_dividend;
} else if (partial_dividend == divisor) {
Q[i] = 1;
remainder = 0;
} else {
- Q[i] = partial_dividend / divisor;
- remainder = partial_dividend - (Q[i] * divisor);
+ Q[i] = (unsigned)(partial_dividend / divisor);
+ remainder = (unsigned)(partial_dividend - (Q[i] * divisor));
}
}
if (R)
}
// Get some facts about the LHS and RHS number of bits and words
- uint32_t rhsBits = RHS.getActiveBits();
- uint32_t rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
+ unsigned rhsBits = RHS.getActiveBits();
+ unsigned rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
assert(rhsWords && "Divided by zero???");
- uint32_t lhsBits = this->getActiveBits();
- uint32_t lhsWords = !lhsBits ? 0 : (APInt::whichWord(lhsBits - 1) + 1);
+ unsigned lhsBits = this->getActiveBits();
+ unsigned lhsWords = !lhsBits ? 0 : (APInt::whichWord(lhsBits - 1) + 1);
// Deal with some degenerate cases
if (!lhsWords)
}
// Get some facts about the LHS
- uint32_t lhsBits = getActiveBits();
- uint32_t lhsWords = !lhsBits ? 0 : (whichWord(lhsBits - 1) + 1);
+ unsigned lhsBits = getActiveBits();
+ unsigned lhsWords = !lhsBits ? 0 : (whichWord(lhsBits - 1) + 1);
// Get some facts about the RHS
- uint32_t rhsBits = RHS.getActiveBits();
- uint32_t rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
+ unsigned rhsBits = RHS.getActiveBits();
+ unsigned rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
assert(rhsWords && "Performing remainder operation by zero ???");
// Check the degenerate cases
void APInt::udivrem(const APInt &LHS, const APInt &RHS,
APInt &Quotient, APInt &Remainder) {
// Get some size facts about the dividend and divisor
- uint32_t lhsBits = LHS.getActiveBits();
- uint32_t lhsWords = !lhsBits ? 0 : (APInt::whichWord(lhsBits - 1) + 1);
- uint32_t rhsBits = RHS.getActiveBits();
- uint32_t rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
+ unsigned lhsBits = LHS.getActiveBits();
+ unsigned lhsWords = !lhsBits ? 0 : (APInt::whichWord(lhsBits - 1) + 1);
+ unsigned rhsBits = RHS.getActiveBits();
+ unsigned rhsWords = !rhsBits ? 0 : (APInt::whichWord(rhsBits - 1) + 1);
// Check the degenerate cases
if (lhsWords == 0) {
if (lhsWords == 1 && rhsWords == 1) {
// There is only one word to consider so use the native versions.
- if (LHS.isSingleWord()) {
- Quotient = APInt(LHS.getBitWidth(), LHS.VAL / RHS.VAL);
- Remainder = APInt(LHS.getBitWidth(), LHS.VAL % RHS.VAL);
- } else {
- Quotient = APInt(LHS.getBitWidth(), LHS.pVal[0] / RHS.pVal[0]);
- Remainder = APInt(LHS.getBitWidth(), LHS.pVal[0] % RHS.pVal[0]);
- }
+ uint64_t lhsValue = LHS.isSingleWord() ? LHS.VAL : LHS.pVal[0];
+ uint64_t rhsValue = RHS.isSingleWord() ? RHS.VAL : RHS.pVal[0];
+ Quotient = APInt(LHS.getBitWidth(), lhsValue / rhsValue);
+ Remainder = APInt(LHS.getBitWidth(), lhsValue % rhsValue);
return;
}
divide(LHS, lhsWords, RHS, rhsWords, &Quotient, &Remainder);
}
-void APInt::fromString(uint32_t numbits, const char *str, uint32_t slen,
+void APInt::fromString(unsigned numbits, const char *str, unsigned slen,
uint8_t radix) {
// Check our assumptions here
assert((radix == 10 || radix == 8 || radix == 16 || radix == 2) &&
pVal = getClearedMemory(getNumWords());
// Figure out if we can shift instead of multiply
- uint32_t shift = (radix == 16 ? 4 : radix == 8 ? 3 : radix == 2 ? 1 : 0);
+ unsigned shift = (radix == 16 ? 4 : radix == 8 ? 3 : radix == 2 ? 1 : 0);
// Set up an APInt for the digit to add outside the loop so we don't
// constantly construct/destruct it.
// Enter digit traversal loop
for (unsigned i = 0; i < slen; i++) {
// Get a digit
- uint32_t digit = 0;
+ unsigned digit = 0;
char cdigit = str[i];
if (radix == 16) {
if (!isxdigit(cdigit))
assert(0 && "huh? we shouldn't get here");
} else if (isdigit(cdigit)) {
digit = cdigit - '0';
+ assert((radix == 10 ||
+ (radix == 8 && digit != 8 && digit != 9) ||
+ (radix == 2 && (digit == 0 || digit == 1))) &&
+ "Invalid digit in string for given radix");
} else {
assert(0 && "Invalid character in digit string");
}
}
}
-std::string APInt::toString(uint8_t radix, bool wantSigned) const {
- assert((radix == 10 || radix == 8 || radix == 16 || radix == 2) &&
+void APInt::toString(SmallVectorImpl<char> &Str, unsigned Radix,
+ bool Signed) const {
+ assert((Radix == 10 || Radix == 8 || Radix == 16 || Radix == 2) &&
"Radix should be 2, 8, 10, or 16!");
- static const char *digits[] = {
- "0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"
- };
- std::string result;
- uint32_t bits_used = getActiveBits();
+
+ // First, check for a zero value and just short circuit the logic below.
+ if (*this == 0) {
+ Str.push_back('0');
+ return;
+ }
+
+ static const char Digits[] = "0123456789ABCDEF";
+
if (isSingleWord()) {
- char buf[65];
- const char *format = (radix == 10 ? (wantSigned ? "%lld" : "%llu") :
- (radix == 16 ? "%llX" : (radix == 8 ? "%llo" : 0)));
- if (format) {
- if (wantSigned) {
- int64_t sextVal = (int64_t(VAL) << (APINT_BITS_PER_WORD-BitWidth)) >>
- (APINT_BITS_PER_WORD-BitWidth);
- sprintf(buf, format, sextVal);
- } else
- sprintf(buf, format, VAL);
- } else {
- memset(buf, 0, 65);
- uint64_t v = VAL;
- while (bits_used) {
- uint32_t bit = v & 1;
- bits_used--;
- buf[bits_used] = digits[bit][0];
- v >>=1;
+ char Buffer[65];
+ char *BufPtr = Buffer+65;
+
+ uint64_t N;
+ if (Signed) {
+ int64_t I = getSExtValue();
+ if (I < 0) {
+ Str.push_back('-');
+ I = -I;
}
+ N = I;
+ } else {
+ N = getZExtValue();
}
- result = buf;
- return result;
- }
-
- if (radix != 10) {
- // For the 2, 8 and 16 bit cases, we can just shift instead of divide
- // because the number of bits per digit (1,3 and 4 respectively) divides
- // equaly. We just shift until there value is zero.
-
- // First, check for a zero value and just short circuit the logic below.
- if (*this == 0)
- result = "0";
- else {
- APInt tmp(*this);
- size_t insert_at = 0;
- if (wantSigned && this->isNegative()) {
- // They want to print the signed version and it is a negative value
- // Flip the bits and add one to turn it into the equivalent positive
- // value and put a '-' in the result.
- tmp.flip();
- tmp++;
- result = "-";
- insert_at = 1;
- }
- // Just shift tmp right for each digit width until it becomes zero
- uint32_t shift = (radix == 16 ? 4 : (radix == 8 ? 3 : 1));
- uint64_t mask = radix - 1;
- APInt zero(tmp.getBitWidth(), 0);
- while (tmp.ne(zero)) {
- unsigned digit = (tmp.isSingleWord() ? tmp.VAL : tmp.pVal[0]) & mask;
- result.insert(insert_at, digits[digit]);
- tmp = tmp.lshr(shift);
- }
+
+ while (N) {
+ *--BufPtr = Digits[N % Radix];
+ N /= Radix;
}
- return result;
+ Str.append(BufPtr, Buffer+65);
+ return;
}
- APInt tmp(*this);
- APInt divisor(4, radix);
- APInt zero(tmp.getBitWidth(), 0);
- size_t insert_at = 0;
- if (wantSigned && tmp[BitWidth-1]) {
+ APInt Tmp(*this);
+
+ if (Signed && isNegative()) {
// They want to print the signed version and it is a negative value
// Flip the bits and add one to turn it into the equivalent positive
// value and put a '-' in the result.
- tmp.flip();
- tmp++;
- result = "-";
- insert_at = 1;
- }
- if (tmp == APInt(tmp.getBitWidth(), 0))
- result = "0";
- else while (tmp.ne(zero)) {
- APInt APdigit(1,0);
- APInt tmp2(tmp.getBitWidth(), 0);
- divide(tmp, tmp.getNumWords(), divisor, divisor.getNumWords(), &tmp2,
- &APdigit);
- uint32_t digit = APdigit.getZExtValue();
- assert(digit < radix && "divide failed");
- result.insert(insert_at,digits[digit]);
- tmp = tmp2;
+ Tmp.flip();
+ Tmp++;
+ Str.push_back('-');
+ }
+
+ // We insert the digits backward, then reverse them to get the right order.
+ unsigned StartDig = Str.size();
+
+ // For the 2, 8 and 16 bit cases, we can just shift instead of divide
+ // because the number of bits per digit (1, 3 and 4 respectively) divides
+ // equaly. We just shift until the value is zero.
+ if (Radix != 10) {
+ // Just shift tmp right for each digit width until it becomes zero
+ unsigned ShiftAmt = (Radix == 16 ? 4 : (Radix == 8 ? 3 : 1));
+ unsigned MaskAmt = Radix - 1;
+
+ while (Tmp != 0) {
+ unsigned Digit = unsigned(Tmp.getRawData()[0]) & MaskAmt;
+ Str.push_back(Digits[Digit]);
+ Tmp = Tmp.lshr(ShiftAmt);
+ }
+ } else {
+ APInt divisor(4, 10);
+ while (Tmp != 0) {
+ APInt APdigit(1, 0);
+ APInt tmp2(Tmp.getBitWidth(), 0);
+ divide(Tmp, Tmp.getNumWords(), divisor, divisor.getNumWords(), &tmp2,
+ &APdigit);
+ unsigned Digit = (unsigned)APdigit.getZExtValue();
+ assert(Digit < Radix && "divide failed");
+ Str.push_back(Digits[Digit]);
+ Tmp = tmp2;
+ }
}
+
+ // Reverse the digits before returning.
+ std::reverse(Str.begin()+StartDig, Str.end());
+}
- return result;
+/// toString - This returns the APInt as a std::string. Note that this is an
+/// inefficient method. It is better to pass in a SmallVector/SmallString
+/// to the methods above.
+std::string APInt::toString(unsigned Radix = 10, bool Signed = true) const {
+ SmallString<40> S;
+ toString(S, Radix, Signed);
+ return S.c_str();
}
-#ifndef NDEBUG
-void APInt::dump() const
-{
- cerr << "APInt(" << BitWidth << ")=" << std::setbase(16);
- if (isSingleWord())
- cerr << VAL;
- else for (unsigned i = getNumWords(); i > 0; i--) {
- cerr << pVal[i-1] << " ";
- }
- cerr << " U(" << this->toStringUnsigned(10) << ") S("
- << this->toStringSigned(10) << ")\n" << std::setbase(10);
+
+void APInt::dump() const {
+ SmallString<40> S, U;
+ this->toStringUnsigned(U);
+ this->toStringSigned(S);
+ fprintf(stderr, "APInt(%db, %su %ss)", BitWidth, U.c_str(), S.c_str());
+}
+
+void APInt::print(raw_ostream &OS, bool isSigned) const {
+ SmallString<40> S;
+ this->toString(S, 10, isSigned);
+ OS << S.c_str();
}
-#endif
// This implements a variety of operations on a representation of
// arbitrary precision, two's-complement, bignum integer values.
/* Assumed by lowHalf, highHalf, partMSB and partLSB. A fairly safe
and unrestricting assumption. */
+#define COMPILE_TIME_ASSERT(cond) extern int CTAssert[(cond) ? 1 : -1]
COMPILE_TIME_ASSERT(integerPartWidth % 2 == 0);
/* Some handy functions local to this file. */
/* Returns the integer part with the least significant BITS set.
BITS cannot be zero. */
- inline integerPart
+ static inline integerPart
lowBitMask(unsigned int bits)
{
assert (bits != 0 && bits <= integerPartWidth);
return ~(integerPart) 0 >> (integerPartWidth - bits);
}
- /* Returns the value of the lower nibble of PART. */
- inline integerPart
+ /* Returns the value of the lower half of PART. */
+ static inline integerPart
lowHalf(integerPart part)
{
return part & lowBitMask(integerPartWidth / 2);
}
- /* Returns the value of the upper nibble of PART. */
- inline integerPart
+ /* Returns the value of the upper half of PART. */
+ static inline integerPart
highHalf(integerPart part)
{
return part >> (integerPartWidth / 2);
}
- /* Returns the bit number of the most significant bit of a part. If
- the input number has no bits set -1U is returned. */
- unsigned int
+ /* Returns the bit number of the most significant set bit of a part.
+ If the input number has no bits set -1U is returned. */
+ static unsigned int
partMSB(integerPart value)
{
unsigned int n, msb;
return msb;
}
- /* Returns the bit number of the least significant bit of a part.
- If the input number has no bits set -1U is returned. */
- unsigned int
+ /* Returns the bit number of the least significant set bit of a
+ part. If the input number has no bits set -1U is returned. */
+ static unsigned int
partLSB(integerPart value)
{
unsigned int n, lsb;
{
unsigned int i;
+ assert (parts > 0);
+
dst[0] = part;
for(i = 1; i < parts; i++)
dst[i] = 0;
parts[bit / integerPartWidth] |= (integerPart) 1 << (bit % integerPartWidth);
}
-/* Returns the bit number of the least significant bit of a number.
- If the input number has no bits set -1U is returned. */
+/* Returns the bit number of the least significant set bit of a
+ number. If the input number has no bits set -1U is returned. */
unsigned int
APInt::tcLSB(const integerPart *parts, unsigned int n)
{
return -1U;
}
-/* Returns the bit number of the most significant bit of a number. If
- the input number has no bits set -1U is returned. */
+/* Returns the bit number of the most significant set bit of a number.
+ If the input number has no bits set -1U is returned. */
unsigned int
APInt::tcMSB(const integerPart *parts, unsigned int n)
{
return -1U;
}
+/* Copy the bit vector of width srcBITS from SRC, starting at bit
+ srcLSB, to DST, of dstCOUNT parts, such that the bit srcLSB becomes
+ the least significant bit of DST. All high bits above srcBITS in
+ DST are zero-filled. */
+void
+APInt::tcExtract(integerPart *dst, unsigned int dstCount, const integerPart *src,
+ unsigned int srcBits, unsigned int srcLSB)
+{
+ unsigned int firstSrcPart, dstParts, shift, n;
+
+ dstParts = (srcBits + integerPartWidth - 1) / integerPartWidth;
+ assert (dstParts <= dstCount);
+
+ firstSrcPart = srcLSB / integerPartWidth;
+ tcAssign (dst, src + firstSrcPart, dstParts);
+
+ shift = srcLSB % integerPartWidth;
+ tcShiftRight (dst, dstParts, shift);
+
+ /* We now have (dstParts * integerPartWidth - shift) bits from SRC
+ in DST. If this is less that srcBits, append the rest, else
+ clear the high bits. */
+ n = dstParts * integerPartWidth - shift;
+ if (n < srcBits) {
+ integerPart mask = lowBitMask (srcBits - n);
+ dst[dstParts - 1] |= ((src[firstSrcPart + dstParts] & mask)
+ << n % integerPartWidth);
+ } else if (n > srcBits) {
+ if (srcBits % integerPartWidth)
+ dst[dstParts - 1] &= lowBitMask (srcBits % integerPartWidth);
+ }
+
+ /* Clear high parts. */
+ while (dstParts < dstCount)
+ dst[dstParts++] = 0;
+}
+
/* DST += RHS + C where C is zero or one. Returns the carry flag. */
integerPart
APInt::tcAdd(integerPart *dst, const integerPart *rhs,
tcIncrement(dst, parts);
}
-/* DST += SRC * MULTIPLIER + PART if add is true
- DST = SRC * MULTIPLIER + PART if add is false
+/* DST += SRC * MULTIPLIER + CARRY if add is true
+ DST = SRC * MULTIPLIER + CARRY if add is false
Requires 0 <= DSTPARTS <= SRCPARTS + 1. If DST overlaps SRC
they must start at the same point, i.e. DST == SRC.
return overflow;
}
-/* DST = LHS * RHS, where DST has twice the width as the operands. No
- overflow occurs. DST must be disjoint from both operands. */
-void
+/* DST = LHS * RHS, where DST has width the sum of the widths of the
+ operands. No overflow occurs. DST must be disjoint from both
+ operands. Returns the number of parts required to hold the
+ result. */
+unsigned int
APInt::tcFullMultiply(integerPart *dst, const integerPart *lhs,
- const integerPart *rhs, unsigned int parts)
+ const integerPart *rhs, unsigned int lhsParts,
+ unsigned int rhsParts)
{
- unsigned int i;
- int overflow;
+ /* Put the narrower number on the LHS for less loops below. */
+ if (lhsParts > rhsParts) {
+ return tcFullMultiply (dst, rhs, lhs, rhsParts, lhsParts);
+ } else {
+ unsigned int n;
- assert(dst != lhs && dst != rhs);
+ assert(dst != lhs && dst != rhs);
- overflow = 0;
- tcSet(dst, 0, parts);
+ tcSet(dst, 0, rhsParts);
- for(i = 0; i < parts; i++)
- overflow |= tcMultiplyPart(&dst[i], lhs, rhs[i], 0, parts,
- parts + 1, true);
+ for(n = 0; n < lhsParts; n++)
+ tcMultiplyPart(&dst[n], rhs, lhs[n], 0, rhsParts, rhsParts + 1, true);
+
+ n = lhsParts + rhsParts;
- assert(!overflow);
+ return n - (dst[n - 1] == 0);
+ }
}
/* If RHS is zero LHS and REMAINDER are left unchanged, return one.
void
APInt::tcShiftLeft(integerPart *dst, unsigned int parts, unsigned int count)
{
- unsigned int jump, shift;
+ if (count) {
+ unsigned int jump, shift;
- /* Jump is the inter-part jump; shift is is intra-part shift. */
- jump = count / integerPartWidth;
- shift = count % integerPartWidth;
+ /* Jump is the inter-part jump; shift is is intra-part shift. */
+ jump = count / integerPartWidth;
+ shift = count % integerPartWidth;
- while (parts > jump) {
- integerPart part;
+ while (parts > jump) {
+ integerPart part;
- parts--;
+ parts--;
- /* dst[i] comes from the two parts src[i - jump] and, if we have
- an intra-part shift, src[i - jump - 1]. */
- part = dst[parts - jump];
- if (shift) {
- part <<= shift;
+ /* dst[i] comes from the two parts src[i - jump] and, if we have
+ an intra-part shift, src[i - jump - 1]. */
+ part = dst[parts - jump];
+ if (shift) {
+ part <<= shift;
if (parts >= jump + 1)
part |= dst[parts - jump - 1] >> (integerPartWidth - shift);
}
- dst[parts] = part;
- }
+ dst[parts] = part;
+ }
- while (parts > 0)
- dst[--parts] = 0;
+ while (parts > 0)
+ dst[--parts] = 0;
+ }
}
/* Shift a bignum right COUNT bits in-place. Shifted in bits are
void
APInt::tcShiftRight(integerPart *dst, unsigned int parts, unsigned int count)
{
- unsigned int i, jump, shift;
+ if (count) {
+ unsigned int i, jump, shift;
- /* Jump is the inter-part jump; shift is is intra-part shift. */
- jump = count / integerPartWidth;
- shift = count % integerPartWidth;
+ /* Jump is the inter-part jump; shift is is intra-part shift. */
+ jump = count / integerPartWidth;
+ shift = count % integerPartWidth;
- /* Perform the shift. This leaves the most significant COUNT bits
- of the result at zero. */
- for(i = 0; i < parts; i++) {
- integerPart part;
+ /* Perform the shift. This leaves the most significant COUNT bits
+ of the result at zero. */
+ for(i = 0; i < parts; i++) {
+ integerPart part;
- if (i + jump >= parts) {
- part = 0;
- } else {
- part = dst[i + jump];
- if (shift) {
- part >>= shift;
- if (i + jump + 1 < parts)
- part |= dst[i + jump + 1] << (integerPartWidth - shift);
+ if (i + jump >= parts) {
+ part = 0;
+ } else {
+ part = dst[i + jump];
+ if (shift) {
+ part >>= shift;
+ if (i + jump + 1 < parts)
+ part |= dst[i + jump + 1] << (integerPartWidth - shift);
+ }
}
- }
- dst[i] = part;
+ dst[i] = part;
+ }
}
}
projects / oota-llvm.git / blobdiff