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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 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 "kernel/celledges.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
void bitwise_unary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool();
int a_width = GetSize(cell->getPort(ID::A));
int y_width = GetSize(cell->getPort(ID::Y));
for (int i = 0; i < y_width; i++)
{
if (i < a_width)
db->add_edge(cell, ID::A, i, ID::Y, i, -1);
else if (is_signed && a_width > 0)
db->add_edge(cell, ID::A, a_width-1, ID::Y, i, -1);
}
}
void bitwise_binary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool();
int a_width = GetSize(cell->getPort(ID::A));
int b_width = GetSize(cell->getPort(ID::B));
int y_width = GetSize(cell->getPort(ID::Y));
if (cell->type == ID($and) && !is_signed) {
if (a_width > b_width)
a_width = b_width;
else
b_width = a_width;
}
for (int i = 0; i < y_width; i++)
{
if (i < a_width)
db->add_edge(cell, ID::A, i, ID::Y, i, -1);
else if (is_signed && a_width > 0)
db->add_edge(cell, ID::A, a_width-1, ID::Y, i, -1);
if (i < b_width)
db->add_edge(cell, ID::B, i, ID::Y, i, -1);
else if (is_signed && b_width > 0)
db->add_edge(cell, ID::B, b_width-1, ID::Y, i, -1);
}
}
void arith_neg_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool();
int a_width = GetSize(cell->getPort(ID::A));
int y_width = GetSize(cell->getPort(ID::Y));
if (is_signed && a_width == 1)
y_width = std::min(y_width, 1);
for (int i = 0; i < y_width; i++)
for (int k = 0; k <= i && k < a_width; k++)
db->add_edge(cell, ID::A, k, ID::Y, i, -1);
}
void arith_binary_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool();
int a_width = GetSize(cell->getPort(ID::A));
int b_width = GetSize(cell->getPort(ID::B));
int y_width = GetSize(cell->getPort(ID::Y));
if (!is_signed && cell->type != ID($sub)) {
int ab_width = std::max(a_width, b_width);
y_width = std::min(y_width, ab_width+1);
}
for (int i = 0; i < y_width; i++)
{
for (int k = 0; k <= i; k++)
{
if (k < a_width)
db->add_edge(cell, ID::A, k, ID::Y, i, -1);
if (k < b_width)
db->add_edge(cell, ID::B, k, ID::Y, i, -1);
}
}
}
void reduce_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
int a_width = GetSize(cell->getPort(ID::A));
for (int i = 0; i < a_width; i++)
db->add_edge(cell, ID::A, i, ID::Y, 0, -1);
}
void compare_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
int a_width = GetSize(cell->getPort(ID::A));
int b_width = GetSize(cell->getPort(ID::B));
for (int i = 0; i < a_width; i++)
db->add_edge(cell, ID::A, i, ID::Y, 0, -1);
for (int i = 0; i < b_width; i++)
db->add_edge(cell, ID::B, i, ID::Y, 0, -1);
}
void mux_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
{
int a_width = GetSize(cell->getPort(ID::A));
int b_width = GetSize(cell->getPort(ID::B));
int s_width = GetSize(cell->getPort(ID::S));
for (int i = 0; i < a_width; i++)
{
db->add_edge(cell, ID::A, i, ID::Y, i, -1);
for (int k = i; k < b_width; k += a_width)
db->add_edge(cell, ID::B, k, ID::Y, i, -1);
for (int k = 0; k < s_width; k++)
db->add_edge(cell, ID::S, k, ID::Y, i, -1);
}
}
PRIVATE_NAMESPACE_END
bool YOSYS_NAMESPACE_PREFIX AbstractCellEdgesDatabase::add_edges_from_cell(RTLIL::Cell *cell)
{
if (cell->type.in(ID($not), ID($pos))) {
bitwise_unary_op(this, cell);
return true;
}
if (cell->type.in(ID($and), ID($or), ID($xor), ID($xnor))) {
bitwise_binary_op(this, cell);
return true;
}
if (cell->type == ID($neg)) {
arith_neg_op(this, cell);
return true;
}
if (cell->type.in(ID($add), ID($sub))) {
arith_binary_op(this, cell);
return true;
}
if (cell->type.in(ID($reduce_and), ID($reduce_or), ID($reduce_xor), ID($reduce_xnor), ID($reduce_bool), ID($logic_not))) {
reduce_op(this, cell);
return true;
}
// FIXME:
// if (cell->type.in(ID($shl), ID($shr), ID($sshl), ID($sshr), ID($shift), ID($shiftx))) {
// shift_op(this, cell);
// return true;
// }
if (cell->type.in(ID($lt), ID($le), ID($eq), ID($ne), ID($eqx), ID($nex), ID($ge), ID($gt))) {
compare_op(this, cell);
return true;
}
if (cell->type.in(ID($mux), ID($pmux))) {
mux_op(this, cell);
return true;
}
// FIXME: $mul $div $mod $slice $concat
// FIXME: $lut $sop $alu $lcu $macc $fa
return false;
}
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