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opt_expr: consume_x to require/imply !keepdc

This commit is contained in:
Eddie Hung 2020-05-08 11:12:43 -07:00
parent 17f4e06247
commit 9694dc42dd
1 changed files with 6 additions and 5 deletions
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11
passes/opt/opt_expr.cc
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@ -543,13 +543,13 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
}
}
if (detect_const_and && (found_zero || found_inv || (!keepdc && found_undef && consume_x))) {
if (detect_const_and && (found_zero || found_inv || (found_undef && consume_x))) {
cover("opt.opt_expr.const_and");
replace_cell(assign_map, module, cell, "const_and", ID::Y, RTLIL::State::S0);
goto next_cell;
}
if (detect_const_or && (found_one || found_inv || (!keepdc && found_undef && consume_x))) {
if (detect_const_or && (found_one || found_inv || (found_undef && consume_x))) {
cover("opt.opt_expr.const_or");
replace_cell(assign_map, module, cell, "const_or", ID::Y, RTLIL::State::S1);
goto next_cell;
@ -1149,7 +1149,7 @@ skip_fine_alu:
goto next_cell;
}
if (!keepdc && consume_x)
if (consume_x)
{
bool identity_wrt_a = false;
bool identity_wrt_b = false;
@ -2041,11 +2041,12 @@ struct OptExprPass : public Pass {
do {
do {
did_something = false;
replace_const_cells(design, module, false, mux_undef, mux_bool, do_fine, keepdc, clkinv);
replace_const_cells(design, module, false /* consume_x */, mux_undef, mux_bool, do_fine, keepdc, clkinv);
if (did_something)
design->scratchpad_set_bool("opt.did_something", true);
} while (did_something);
replace_const_cells(design, module, true, mux_undef, mux_bool, do_fine, keepdc, clkinv);
if (!keepdc)
replace_const_cells(design, module, true /* consume_x */, mux_undef, mux_bool, do_fine, keepdc, clkinv);
if (did_something)
design->scratchpad_set_bool("opt.did_something", true);
} while (did_something);