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Add $bmux and $demux cells.

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This commit is contained in:
Marcelina Kościelnicka 2022-01-24 16:02:29 +01:00
parent db33b1e535
commit 93508d58da
25 changed files with 694 additions and 49 deletions
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36
backends/cxxrtl/cxxrtl.h
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@ -457,6 +457,42 @@ struct value : public expr_base<value<Bits>> {
return shr<AmountBits, /*Signed=*/true>(amount);
}
template<size_t ResultBits, size_t SelBits>
value<ResultBits> bmux(const value<SelBits> &sel) const {
static_assert(ResultBits << SelBits == Bits, "invalid sizes used in bmux()");
size_t amount = sel.data[0] * ResultBits;
size_t shift_chunks = amount / chunk::bits;
size_t shift_bits = amount % chunk::bits;
value<ResultBits> result;
chunk::type carry = 0;
if (ResultBits % chunk::bits + shift_bits > chunk::bits)
carry = data[result.chunks + shift_chunks] << (chunk::bits - shift_bits);
for (size_t n = 0; n < result.chunks; n++) {
result.data[result.chunks - 1 - n] = carry | (data[result.chunks + shift_chunks - 1 - n] >> shift_bits);
carry = (shift_bits == 0) ? 0
: data[result.chunks + shift_chunks - 1 - n] << (chunk::bits - shift_bits);
}
return result;
}
template<size_t ResultBits, size_t SelBits>
value<ResultBits> demux(const value<SelBits> &sel) const {
static_assert(Bits << SelBits == ResultBits, "invalid sizes used in demux()");
size_t amount = sel.data[0] * Bits;
size_t shift_chunks = amount / chunk::bits;
size_t shift_bits = amount % chunk::bits;
value<ResultBits> result;
chunk::type carry = 0;
for (size_t n = 0; n < chunks; n++) {
result.data[shift_chunks + n] = (data[n] << shift_bits) | carry;
carry = (shift_bits == 0) ? 0
: data[n] >> (chunk::bits - shift_bits);
}
if (Bits % chunk::bits + shift_bits > chunk::bits)
result.data[shift_chunks + chunks] = carry;
return result;
}
size_t ctpop() const {
size_t count = 0;
for (size_t n = 0; n < chunks; n++) {