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cost: Add $mem_v2, $macc_v2 estimates

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This commit is contained in:
Martin Povišer 2025-03-18 13:51:09 +01:00
parent 91cd382f8b
commit 251285be4c
1 changed files with 22 additions and 2 deletions
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24
kernel/cost.cc
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@ -1,4 +1,5 @@
#include "kernel/cost.h"
#include "kernel/macc.h"
USING_YOSYS_NAMESPACE
@ -148,6 +149,9 @@ unsigned int CellCosts::get(RTLIL::Cell *cell)
log_assert(cell->hasPort(ID::Q) && "Weird flip flop");
log_debug("%s is ff\n", cell->name.c_str());
return cell->getParam(ID::WIDTH).as_int();
} else if (cell->type.in(ID($mem), ID($mem_v2))) {
log_debug("%s is mem\n", cell->name.c_str());
return cell->getParam(ID::WIDTH).as_int() * cell->getParam(ID::SIZE).as_int();
} else if (y_coef(cell->type)) {
// linear with Y_WIDTH or WIDTH
log_assert((cell->hasParam(ID::Y_WIDTH) || cell->hasParam(ID::WIDTH)) && "Unknown width");
@ -173,6 +177,22 @@ unsigned int CellCosts::get(RTLIL::Cell *cell)
unsigned int coef = cell->type == ID($mul) ? 3 : 5;
log_debug("%s coef*(sum**2) %d * %d\n", cell->name.c_str(), coef, sum * sum);
return coef * sum * sum;
} else if (cell->type.in(ID($macc), ID($macc_v2))) {
// quadratic per term
unsigned int cost_sum = 0;
Macc macc;
macc.from_cell(cell);
unsigned int y_width = cell->getParam(ID::Y_WIDTH).as_int();
for (auto &term: macc.terms) {
if (term.in_b.empty()) {
// neglect addends
continue;
}
unsigned a_width = term.in_a.size(), b_width = term.in_b.size();
unsigned int sum = a_width + b_width + std::min(y_width, a_width + b_width);
cost_sum += 3 * sum * sum;
}
return cost_sum;
} else if (cell->type == ID($lut)) {
int width = cell->getParam(ID::WIDTH).as_int();
unsigned int cost = 1U << (unsigned int)width;
@ -187,8 +207,8 @@ unsigned int CellCosts::get(RTLIL::Cell *cell)
log_debug("%s is free\n", cell->name.c_str());
return 0;
}
// TODO: $fsm $mem.* $macc
// ignored: $pow
// TODO: $fsm
// ignored: $pow $memrd $memwr $meminit (and v2 counterparts)
log_warning("Can't determine cost of %s cell (%d parameters).\n", log_id(cell->type), GetSize(cell->parameters));
return 1;