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cxxrtl: Fix value::ctlz

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This commit is contained in:
Merry 2023-12-13 12:15:12 +00:00
parent ded63bedd5
commit d7cb6981b5
2 changed files with 9 additions and 2 deletions
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3
backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
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@ -511,7 +511,8 @@ struct value : public expr_base<value<Bits>> {
for (size_t n = 0; n < chunks; n++) {
chunk::type x = data[chunks - 1 - n];
// First add to `count` as if the chunk is zero
count += (n == 0 ? Bits % chunk::bits : chunk::bits);
constexpr size_t msb_chunk_bits = Bits % chunk::bits != 0 ? Bits % chunk::bits : chunk::bits;
count += (n == 0 ? msb_chunk_bits : chunk::bits);
// If the chunk isn't zero, correct the `count` value and return
if (x != 0) {
for (; x != 0; count--)

8
tests/cxxrtl/test_value.cc
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@ -36,4 +36,10 @@ int main()
cxxrtl::value<64> c = a.sshr(b);
assert(c.get<uint64_t>() == 0xffffffff8abcdef1u);
}
}
{
// ctlz should work with Bits that are a multiple of chunk size
cxxrtl::value<32> a(0x00040000u);
assert(a.ctlz() == 13);
}
}