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ice40: Adding cell utilities for packing

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah
2018-06-12 11:49:54 +02:00
parent 3ce32b6b1d
commit 5f813410aa
4 changed files with 191 additions and 15 deletions
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34
common/design_utils.cc
View File

@@ -19,22 +19,30 @@
#include "design_utils.h"
void replace_port(CellInfo *old_cell, PortInfo *old, CellInfo *rep_cell,
PortInfo *rep)
void replace_port(CellInfo *old_cell, IdString old_name, CellInfo *rep_cell,
IdString rep_name)
{
assert(old->type == rep->type);
PortInfo &old = old_cell->ports.at(old_name);
PortInfo &rep = rep_cell->ports.at(rep_name);
assert(old.type == rep.type);
rep->net = old->net;
old->net = nullptr;
if (rep->type == PORT_OUT) {
rep->net->driver.cell = rep_cell;
rep->net->driver.port = rep->name;
} else if (rep->type == PORT_IN) {
for (PortRef &load : rep->net->users) {
if (load.cell == old_cell && load.port == old->name) {
load.cell = rep_cell;
load.port = rep->name;
rep.net = old.net;
old.net = nullptr;
if (rep.type == PORT_OUT) {
if (rep.net != nullptr) {
rep.net->driver.cell = rep_cell;
rep.net->driver.port = rep_name;
}
} else if (rep.type == PORT_IN) {
if (rep.net != nullptr) {
for (PortRef &load : rep.net->users) {
if (load.cell == old_cell && load.port == old_name) {
load.cell = rep_cell;
load.port = rep_name;
}
}
}
} else {
assert(false);
}
}

8
common/design_utils.h
View File

@@ -19,13 +19,15 @@
#include "nextpnr.h"
#ifndef DESIGN_UTILS_H
#define DESIGN_UTILS_H
/*
Utilities for design manipulation, intended for use inside packing algorithms
*/
// Disconnect a net (if connected) from old, and connect it to rep
void replace_port(CellInfo *old_cell, PortInfo *old, CellInfo *rep_cell,
PortInfo *rep);
void replace_port(CellInfo *old_cell, IdString old_name, CellInfo *rep_cell,
IdString rep_name);
// If a net drives a given port of a cell matching a predicate (in many
// cases more than one cell type, e.g. SB_DFFxx so a predicate is used), return
@@ -58,3 +60,5 @@ CellInfo *net_driven_by(NetInfo *net, F1 cell_pred, IdString port)
return nullptr;
}
}
#endif