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mem/extract_rdff: Fix "no FF made" edge case.

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When converting a sync transparent read port with const address to async
read port, nothing at all needs to be done other than clk_enable change,
and thus we have no FF cell to return.  Handle this case correctly in
the helper and in its users.
This commit is contained in:
Marcelina Kościelnicka 2021-05-25 22:39:50 +02:00
parent 18806f1ef6
commit d99fce3bc7
2 changed files with 9 additions and 3 deletions
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7
passes/memory/memory_nordff.cc
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@ -57,9 +57,12 @@ struct MemoryNordffPass : public Pass {
for (auto &mem : Mem::get_selected_memories(module))
{
bool changed = false;
for (int i = 0; i < GetSize(mem.rd_ports); i++)
if (mem.extract_rdff(i, &initvals))
for (int i = 0; i < GetSize(mem.rd_ports); i++) {
if (mem.rd_ports[i].clk_enable) {
mem.extract_rdff(i, &initvals);
changed = true;
}
}
if (changed)
mem.emit();