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cxxrtl: remove unused signedDivideWithRemainder

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Charlotte 2023-06-28 11:51:25 +10:00 • committed by Marcelina Kościelnicka
parent a1de898fcc
commit bfa8b631bf
1 changed files with 0 additions and 55 deletions
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55
backends/cxxrtl/cxxrtl.h
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@ -661,61 +661,6 @@ struct value : public expr_base<value<Bits>> {
chunk::type part2 = (x == num.chunks) ? 0 : (num.data[x] << y);
return part1 | part2;
}
// parallel to BigInteger::divideWithRemainder; quotient is stored in q,
// *this is left with the remainder. See that function for commentary describing
// how/why this works.
void signedDivideWithRemainder(const value<Bits> &b, value<Bits> &q) {
assert(this != &q);
if (this == &b || &q == &b) {
value<Bits> tmpB(b);
signedDivideWithRemainder(tmpB, q);
return;
}
if (b.is_zero()) {
q = value<Bits>{0u};
return;
}
if (is_zero()) {
q = value<Bits>{0u};
return;
}
// BigInteger has a separate 'mag' to its sign. We don't, so the lazy
// approach is to improvise said.
auto mag = *this;
bool neg = mag.is_neg();
if (neg)
mag = mag.neg();
auto bmag = b;
bool bneg = bmag.is_neg();
if (bneg)
bmag = bmag.neg();
bool qneg = false;
if (neg != b.is_neg()) {
qneg = true;
mag = mag.sub(value<Bits>{1u});
}
mag.divideWithRemainder(bmag, q);
if (neg != bneg) {
q = q.add(value<Bits>{1u});
mag = bmag.sub(mag);
mag = mag.sub(value<Bits>{1u});
}
neg = bneg;
*this = neg ? mag.neg() : mag;
if (qneg)
q = q.neg();
}
};
// Expression template for a slice, usable as lvalue or rvalue, and composable with other expression templates here.