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https://github.com/c64scene-ar/llvm-6502.git
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add a few operations for signed operations that also
return an overflow flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116452 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -741,11 +741,11 @@ public:
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/// RHS are treated as unsigned quantities for purposes of this division.
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/// @returns a new APInt value containing the division result
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/// @brief Unsigned division operation.
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APInt udiv(const APInt& RHS) const;
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APInt udiv(const APInt &RHS) const;
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/// Signed divide this APInt by APInt RHS.
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/// @brief Signed division function for APInt.
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APInt sdiv(const APInt& RHS) const {
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APInt sdiv(const APInt &RHS) const {
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if (isNegative())
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if (RHS.isNegative())
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return (-(*this)).udiv(-RHS);
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@ -763,11 +763,11 @@ public:
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/// which is *this.
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/// @returns a new APInt value containing the remainder result
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/// @brief Unsigned remainder operation.
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APInt urem(const APInt& RHS) const;
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APInt urem(const APInt &RHS) const;
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/// Signed remainder operation on APInt.
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/// @brief Function for signed remainder operation.
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APInt srem(const APInt& RHS) const {
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APInt srem(const APInt &RHS) const {
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if (isNegative())
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if (RHS.isNegative())
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return -((-(*this)).urem(-RHS));
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@ -788,8 +788,7 @@ public:
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APInt &Quotient, APInt &Remainder);
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static void sdivrem(const APInt &LHS, const APInt &RHS,
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APInt &Quotient, APInt &Remainder)
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{
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APInt &Quotient, APInt &Remainder) {
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if (LHS.isNegative()) {
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if (RHS.isNegative())
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APInt::udivrem(-LHS, -RHS, Quotient, Remainder);
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@ -804,6 +803,16 @@ public:
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APInt::udivrem(LHS, RHS, Quotient, Remainder);
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}
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}
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// Operations that return overflow indicators.
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// ssub_ov - Signed subtraction. Unsigned subtraction never overflows.
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APInt sadd_ov(const APInt &RHS, bool &Overflow);
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APInt ssub_ov(const APInt &RHS, bool &Overflow);
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APInt sdiv_ov(const APInt &RHS, bool &Overflow);
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APInt smul_ov(const APInt &RHS, bool &Overflow);
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APInt sshl_ov(unsigned Amt, bool &Overflow);
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/// @returns the bit value at bitPosition
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/// @brief Array-indexing support.
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@ -988,6 +997,9 @@ public:
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return sge(APInt(getBitWidth(), RHS));
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}
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/// This operation tests if there are any pairs of corresponding bits
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/// between this APInt and RHS that are both set.
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bool intersects(const APInt &RHS) const {
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@ -1029,7 +1041,7 @@ public:
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/// @name Bit Manipulation Operators
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/// @{
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/// @brief Set every bit to 1.
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APInt& set() {
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APInt &set() {
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if (isSingleWord()) {
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VAL = -1ULL;
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return clearUnusedBits();
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@ -1044,10 +1056,10 @@ public:
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/// Set the given bit to 1 whose position is given as "bitPosition".
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/// @brief Set a given bit to 1.
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APInt& set(unsigned bitPosition);
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APInt &set(unsigned bitPosition);
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/// @brief Set every bit to 0.
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APInt& clear() {
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APInt &clear() {
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if (isSingleWord())
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VAL = 0;
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else
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@ -1057,10 +1069,10 @@ public:
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/// Set the given bit to 0 whose position is given as "bitPosition".
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/// @brief Set a given bit to 0.
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APInt& clear(unsigned bitPosition);
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APInt &clear(unsigned bitPosition);
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/// @brief Toggle every bit to its opposite value.
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APInt& flip() {
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APInt &flip() {
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if (isSingleWord()) {
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VAL ^= -1ULL;
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return clearUnusedBits();
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@ -2046,6 +2046,52 @@ void APInt::udivrem(const APInt &LHS, const APInt &RHS,
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divide(LHS, lhsWords, RHS, rhsWords, &Quotient, &Remainder);
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}
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APInt APInt::sadd_ov(const APInt &RHS, bool &Overflow) {
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APInt Res = *this+RHS;
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Overflow = isNonNegative() == RHS.isNonNegative() &&
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Res.isNonNegative() != isNonNegative();
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return Res;
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}
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APInt APInt::ssub_ov(const APInt &RHS, bool &Overflow) {
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APInt Res = *this - RHS;
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Overflow = isNonNegative() != RHS.isNonNegative() &&
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Res.isNonNegative() != isNonNegative();
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return Res;
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}
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APInt APInt::sdiv_ov(const APInt &RHS, bool &Overflow) {
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// MININT/-1 --> overflow.
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Overflow = isMinSignedValue() && RHS.isAllOnesValue();
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return sdiv(RHS);
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}
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APInt APInt::smul_ov(const APInt &RHS, bool &Overflow) {
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APInt Res = *this * RHS;
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if (*this != 0 && RHS != 0)
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Overflow = Res.sdiv(RHS) != *this || Res.sdiv(*this) != RHS;
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else
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Overflow = false;
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return Res;
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}
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APInt APInt::sshl_ov(unsigned ShAmt, bool &Overflow) {
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Overflow = ShAmt >= getBitWidth();
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if (Overflow)
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ShAmt = getBitWidth()-1;
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if (isNonNegative()) // Don't allow sign change.
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Overflow = ShAmt >= countLeadingZeros();
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else
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Overflow = ShAmt >= countLeadingOnes();
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return *this << ShAmt;
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}
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void APInt::fromString(unsigned numbits, StringRef str, uint8_t radix) {
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// Check our assumptions here
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assert(!str.empty() && "Invalid string length");
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