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Fixed $eq/$ne bitwise optimization in opt_const

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This commit is contained in:
Clifford Wolf 2013-11-07 11:54:59 +01:00
parent 536621a98b
commit db42a8f89b
1 changed files with 10 additions and 9 deletions
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19
passes/opt/opt_const.cc
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@ -146,16 +146,15 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
if (cell->type == "$eq" || cell->type == "$ne")
{
if (cell->parameters["\\A_WIDTH"].as_int() != cell->parameters["\\B_WIDTH"].as_int()) {
int width = std::max(cell->parameters["\\A_WIDTH"].as_int(), cell->parameters["\\B_WIDTH"].as_int());
cell->connections["\\A"].extend(width, cell->parameters["\\A_SIGNED"].as_bool() && cell->parameters["\\B_SIGNED"].as_bool());
cell->connections["\\B"].extend(width, cell->parameters["\\A_SIGNED"].as_bool() && cell->parameters["\\B_SIGNED"].as_bool());
cell->parameters["\\A_WIDTH"] = width;
cell->parameters["\\B_WIDTH"] = width;
}
RTLIL::SigSpec a = cell->connections["\\A"];
RTLIL::SigSpec b = cell->connections["\\B"];
if (cell->parameters["\\A_WIDTH"].as_int() != cell->parameters["\\B_WIDTH"].as_int()) {
int width = std::max(cell->parameters["\\A_WIDTH"].as_int(), cell->parameters["\\B_WIDTH"].as_int());
a.extend(width, cell->parameters["\\A_SIGNED"].as_bool() && cell->parameters["\\B_SIGNED"].as_bool());
b.extend(width, cell->parameters["\\A_SIGNED"].as_bool() && cell->parameters["\\B_SIGNED"].as_bool());
}
RTLIL::SigSpec new_a, new_b;
a.expand(), b.expand();
@ -179,7 +178,9 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
}
if (new_a.width == 0) {
replace_cell(module, cell, "empty", "\\Y", RTLIL::SigSpec(cell->type == "$eq" ? RTLIL::State::S1 : RTLIL::State::S0));
RTLIL::SigSpec new_y = RTLIL::SigSpec(cell->type == "$eq" ? RTLIL::State::S1 : RTLIL::State::S0);
new_y.extend(cell->parameters["\\Y_WIDTH"].as_int(), false);
replace_cell(module, cell, "empty", "\\Y", new_y);
goto next_cell;
}
}