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nexus: Add resource cost overrides

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Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2021-09-24 19:12:01 +01:00
parent ab6990f908
commit 718ee441a0
2 changed files with 21 additions and 2 deletions
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21
nexus/arch.cc
View File

@ -705,6 +705,21 @@ void Arch::pre_routing()
}
}
}
namespace {
float router2_base_cost(Context *ctx, WireId wire, PipId pip, float crit_weight)
{
(void)crit_weight; // unused
if (pip != PipId()) {
auto &data = ctx->pip_data(pip);
if (data.flags & PIP_ZERO_RR_COST)
return 1e-12;
if (data.flags & PIP_DRMUX_C)
return 1e15;
}
return ctx->getDelayNS(ctx->getPipDelay(pip).maxDelay() + ctx->getWireDelay(wire).maxDelay() +
ctx->getDelayEpsilon());
}
} // namespace
bool Arch::route()
{
@ -719,7 +734,9 @@ bool Arch::route()
if (router == "router1") {
result = router1(getCtx(), Router1Cfg(getCtx()));
} else if (router == "router2") {
router2(getCtx(), Router2Cfg(getCtx()));
Router2Cfg cfg(getCtx());
cfg.get_base_cost = router2_base_cost;
router2(getCtx(), cfg);
result = true;
} else {
log_error("Nexus architecture does not support router '%s'\n", router.c_str());
@ -1030,7 +1047,7 @@ const std::vector<std::string> Arch::availablePlacers = {"sa",
};
const std::string Arch::defaultRouter = "router1";
const std::string Arch::defaultRouter = "router2";
const std::vector<std::string> Arch::availableRouters = {"router1", "router2"};
NEXTPNR_NAMESPACE_END

2
nexus/arch.h
View File

@ -87,6 +87,8 @@ enum PipFlags
{
PIP_FIXED_CONN = 0x8000,
PIP_LUT_PERM = 0x4000,
PIP_ZERO_RR_COST = 0x2000,
PIP_DRMUX_C = 0x1000,
};
NPNR_PACKED_STRUCT(struct PipInfoPOD {