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Add constraint weight as a command line option

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-08-03 18:31:54 +02:00
parent 4a751d9aaf
commit b937e6defe
7 changed files with 27 additions and 8 deletions
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9
common/placer1.cc
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@ -46,7 +46,7 @@ NEXTPNR_NAMESPACE_BEGIN
class SAPlacer
{
public:
SAPlacer(Context *ctx) : ctx(ctx)
SAPlacer(Context *ctx, Placer1Cfg cfg) : ctx(ctx), cfg(cfg)
{
int num_bel_types = 0;
for (auto bel : ctx->getBels()) {
@ -395,7 +395,7 @@ private:
if (other != IdString())
new_dist += get_constraints_distance(ctx, other_cell);
delta = new_metric - curr_metric;
delta += (10 / temp) * (new_dist - old_dist);
delta += (cfg.constraintWeight / temp) * (new_dist - old_dist);
n_move++;
// SA acceptance criterea
if (delta < 0 || (temp > 1e-6 && (ctx->rng() / float(0x3fffffff)) <= std::exp(-delta / temp))) {
@ -458,12 +458,13 @@ private:
const float legalise_temp = 1;
const float post_legalise_temp = 10;
const float post_legalise_dia_scale = 1.5;
Placer1Cfg cfg;
};
bool placer1(Context *ctx)
bool placer1(Context *ctx, Placer1Cfg cfg)
{
try {
SAPlacer placer(ctx);
SAPlacer placer(ctx, cfg);
placer.place();
log_info("Checksum: 0x%08x\n", ctx->checksum());
#ifndef NDEBUG

7
common/placer1.h
View File

@ -23,7 +23,12 @@
NEXTPNR_NAMESPACE_BEGIN
extern bool placer1(Context *ctx);
struct Placer1Cfg
{
float constraintWeight = 10;
};
extern bool placer1(Context *ctx, Placer1Cfg cfg);
NEXTPNR_NAMESPACE_END

2
ecp5/arch.cc
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@ -426,7 +426,7 @@ delay_t Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, de
// -----------------------------------------------------------------------
bool Arch::place() { return placer1(getCtx()); }
bool Arch::place() { return placer1(getCtx(), Placer1Cfg()); }
bool Arch::route()
{

2
generic/arch.cc
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@ -412,7 +412,7 @@ delay_t Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, de
// ---------------------------------------------------------------
bool Arch::place() { return placer1(getCtx()); }
bool Arch::place() { return placer1(getCtx()\, Placer1Cfg()); }
bool Arch::route() { return router1(getCtx(), Router1Cfg()); }

6
ice40/arch.cc
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@ -659,7 +659,11 @@ delay_t Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, de
// -----------------------------------------------------------------------
bool Arch::place() { return placer1(getCtx()); }
bool Arch::place() {
Placer1Cfg cfg;
cfg.constraintWeight = placer_constraintWeight;
return placer1(getCtx(), cfg);
}
bool Arch::route()
{

3
ice40/arch.h
View File

@ -797,6 +797,9 @@ struct Arch : BaseCtx
}
NPNR_ASSERT_FALSE("Expected PLL pin to share an output with an SB_IO D_IN_{0,1}");
}
float placer_constraintWeight = 10;
};
NEXTPNR_NAMESPACE_END

6
ice40/main.cc
View File

@ -106,6 +106,8 @@ int main(int argc, char *argv[])
options.add_options()("seed", po::value<int>(), "seed value for random number generator");
options.add_options()("slack_redist_iter", po::value<int>(),
"number of iterations between slack redistribution");
options.add_options()("cstrweight", po::value<float>(), "placer weighting for relative constraint satisfaction");
options.add_options()("version,V", "show version");
options.add_options()("tmfuzz", "run path delay estimate fuzzer");
options.add_options()("test", "check architecture database integrity");
@ -318,6 +320,10 @@ int main(int argc, char *argv[])
ctx->slack_redist_iter = vm["slack_redist_iter"].as<int>();
}
if (vm.count("cstrweight")) {
ctx->placer_constraintWeight = vm["cstrweight"].as<float>();
}
if (vm.count("svg")) {
std::cout << "<svg xmlns=\"http://www.w3.org/2000/svg\" "
"xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n";