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Adding some 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 11:02:07 +02:00
parent 19aefe374c
commit 3ce32b6b1d
2 changed files with 100 additions and 0 deletions
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common/design_utils.cc Normal file
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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "design_utils.h"
void replace_port(CellInfo *old_cell, PortInfo *old, CellInfo *rep_cell,
PortInfo *rep)
{
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;
}
}
}
}

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common/design_utils.h Normal file
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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "nextpnr.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);
// 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
// the first instance of that cell (otherwise nullptr). If exclusive is set to
// true, then this cell must be the only load
template <typename F1>
CellInfo *net_only_drives(NetInfo *net, F1 cell_pred, IdString port,
bool exclusive = false)
{
if (exclusive && (net->users.size() != 1)) {
return nullptr;
} else {
for (const auto &load : net->users) {
if (cell_pred(load.cell) && load.port == port) {
return load.cell;
}
}
return nullptr;
}
}
// If a net is driven by a given port of a cell matching a predicate, return
// that cell, otherwise nullptr
template <typename F1>
CellInfo *net_driven_by(NetInfo *net, F1 cell_pred, IdString port)
{
if (cell_pred(net->driver.cell) && net->driver.port == port) {
return net->driver.cell;
} else {
return nullptr;
}
}