forked from OSchip/llvm-project
Make add_1 exit early if carry is 0.
Fix line breaks and 80 cols violation. Simplify operator^= since bitwidths must be the same. llvm-svn: 34388
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@ -139,13 +139,16 @@ APInt& APInt::operator=(uint64_t RHS) {
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/// returns the carry.
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/// returns the carry.
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/// @returns the carry of the addition.
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/// @returns the carry of the addition.
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static uint64_t add_1(uint64_t dest[], uint64_t x[], unsigned len, uint64_t y) {
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static uint64_t add_1(uint64_t dest[], uint64_t x[], unsigned len, uint64_t y) {
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uint64_t carry = y;
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for (unsigned i = 0; i < len; ++i) {
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for (unsigned i = 0; i < len; ++i) {
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dest[i] = carry + x[i];
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dest[i] = y + x[i];
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carry = (dest[i] < carry) ? 1 : 0;
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if (dest[i] < y)
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y = 1;
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else {
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y = 0;
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break;
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}
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}
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}
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return carry;
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return y;
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}
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}
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/// @brief Prefix increment operator. Increments the APInt by one.
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/// @brief Prefix increment operator. Increments the APInt by one.
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@ -161,20 +164,17 @@ APInt& APInt::operator++() {
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/// sub_1 - This function subtracts the integer array x[] by
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/// sub_1 - This function subtracts the integer array x[] by
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/// integer y and returns the borrow-out carry.
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/// integer y and returns the borrow-out carry.
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static uint64_t sub_1(uint64_t x[], unsigned len, uint64_t y) {
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static uint64_t sub_1(uint64_t x[], unsigned len, uint64_t y) {
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uint64_t cy = y;
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for (unsigned i = 0; i < len; ++i) {
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for (unsigned i = 0; i < len; ++i) {
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uint64_t X = x[i];
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uint64_t X = x[i];
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x[i] -= cy;
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x[i] -= y;
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if (cy > X)
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if (y > X)
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cy = 1;
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y = 1;
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else {
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else {
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cy = 0;
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y = 0;
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break;
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break;
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}
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}
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}
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}
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return y;
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return cy;
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}
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}
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/// @brief Prefix decrement operator. Decrements the APInt by one.
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/// @brief Prefix decrement operator. Decrements the APInt by one.
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@ -188,10 +188,8 @@ APInt& APInt::operator--() {
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/// add - This function adds the integer array x[] by integer array
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/// add - This function adds the integer array x[] by integer array
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/// y[] and returns the carry.
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/// y[] and returns the carry.
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static uint64_t add(uint64_t dest[], uint64_t x[],
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static uint64_t add(uint64_t dest[], uint64_t x[], uint64_t y[], unsigned len) {
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uint64_t y[], unsigned len) {
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unsigned carry = 0;
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unsigned carry = 0;
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for (unsigned i = 0; i< len; ++i) {
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for (unsigned i = 0; i< len; ++i) {
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carry += x[i];
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carry += x[i];
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dest[i] = carry + y[i];
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dest[i] = carry + y[i];
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@ -223,8 +221,7 @@ APInt& APInt::operator+=(const APInt& RHS) {
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/// sub - This function subtracts the integer array x[] by
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/// sub - This function subtracts the integer array x[] by
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/// integer array y[], and returns the borrow-out carry.
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/// integer array y[], and returns the borrow-out carry.
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static uint64_t sub(uint64_t dest[], uint64_t x[],
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static uint64_t sub(uint64_t dest[], uint64_t x[], uint64_t y[], unsigned len) {
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uint64_t y[], unsigned len) {
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// Carry indicator.
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// Carry indicator.
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uint64_t cy = 0;
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uint64_t cy = 0;
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@ -252,7 +249,8 @@ APInt& APInt::operator-=(const APInt& RHS) {
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else {
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else {
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if (RHS.getNumWords() < getNumWords()) {
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if (RHS.getNumWords() < getNumWords()) {
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uint64_t carry = sub(pVal, pVal, RHS.pVal, RHS.getNumWords());
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uint64_t carry = sub(pVal, pVal, RHS.pVal, RHS.getNumWords());
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sub_1(pVal + RHS.getNumWords(), getNumWords() - RHS.getNumWords(), carry);
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sub_1(pVal + RHS.getNumWords(), getNumWords() - RHS.getNumWords(),
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carry);
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}
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}
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else
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else
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sub(pVal, pVal, RHS.pVal, getNumWords());
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sub(pVal, pVal, RHS.pVal, getNumWords());
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@ -410,23 +408,12 @@ APInt& APInt::operator|=(const APInt& RHS) {
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APInt& APInt::operator^=(const APInt& RHS) {
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APInt& APInt::operator^=(const APInt& RHS) {
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assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
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assert(BitWidth == RHS.BitWidth && "Bit widths must be the same");
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if (isSingleWord()) {
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if (isSingleWord()) {
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if (RHS.isSingleWord()) VAL ^= RHS.VAL;
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VAL ^= RHS.VAL;
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else VAL ^= RHS.pVal[0];
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return *this;
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} else {
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}
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if (RHS.isSingleWord()) {
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unsigned numWords = getNumWords();
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for (unsigned i = 0; i < getNumWords(); ++i)
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for (unsigned i = 0; i < numWords; ++i)
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pVal[i] ^= RHS.VAL;
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pVal[i] ^= RHS.pVal[i];
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} else {
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unsigned minwords = getNumWords() < RHS.getNumWords() ?
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getNumWords() : RHS.getNumWords();
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for (unsigned i = 0; i < minwords; ++i)
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pVal[i] ^= RHS.pVal[i];
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if (getNumWords() > minwords)
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for (unsigned i = minwords; i < getNumWords(); ++i)
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pVal[i] ^= 0;
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}
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}
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clearUnusedBits();
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return *this;
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return *this;
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}
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}
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