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opt_mem_feedback: Respect write port priority.

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This commit is contained in:
Marcelina Kościelnicka 2021-05-25 15:17:29 +02:00
parent 4858721637
commit 5628f5a88f
2 changed files with 62 additions and 0 deletions
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15
passes/opt/opt_mem_feedback.cc
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@ -237,6 +237,21 @@ struct OptMemFeedbackWorker
log("Populating enable bits on write ports of memory %s.%s with async read feedback:\n", log_id(module), log_id(mem.memid));
// If a write port has a feedback path that we're about to bypass,
// but also has priority over some other write port, the feedback
// path is not necessarily a NOP — it may overwrite the other port.
// Emulate this effect by converting the priority to soft logic
// (this will affect the other port's enable signal).
for (auto &it : portbit_conds)
{
int wrport_idx = it.first.first;
auto &port = mem.wr_ports[wrport_idx];
for (int i = 0; i < wrport_idx; i++)
if (port.priority_mask[i])
mem.emulate_priority(i, wrport_idx);
}
for (auto &it : portbit_conds)
{
int wrport_idx = it.first.first;