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vvp: Implement partial writes to 2-state arrays 

Writes to 2-state arrays currently only support full writes. If the write
is a partial write it will trigger an assert. E.g.

```
int a[3:0]
int i = -1;
a[i+:8] = 8'h0; // Triggers assert
```

Add support for partial writes by doing a read-modify-write in the same way
as for 4-state arrays.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
This commit is contained in:
Lars-Peter Clausen 2022-01-01 10:00:22 +01:00
parent 9a50956f5e
commit 2346cc8b69
1 changed files with 15 additions and 4 deletions
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19
vvp/array.cc
View File

@ -602,10 +602,21 @@ void __vpiArray::set_word(unsigned address, unsigned part_off, const vvp_vector4
if (vals) {
assert(nets == 0);
// FIXME: For now, assume no part select of word?
assert(part_off==0);
assert(val.size() == vals_width);
vals->set_word(address, val);
if (part_off != 0 || val.size() != vals_width) {
vvp_vector4_t tmp;
vals->get_word(address, tmp);
if ((part_off + val.size()) > tmp.size()) {
cerr << "part_off=" << part_off
<< " val.size()=" << val.size()
<< " vals[address].size()=" << tmp.size()
<< " vals_width=" << vals_width << endl;
assert(0);
}
tmp.set_vec(part_off, val);
vals->set_word(address, tmp);
} else {
vals->set_word(address, val);
}
word_change(address);
return;
}