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ecp5: Fixing global router bugs

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-09-29 17:01:19 +01:00
parent 2a0bb2be29
commit 9ff5d5a735
1 changed files with 14 additions and 3 deletions
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17
ecp5/globals.cc
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@ -198,17 +198,19 @@ class Ecp5GlobalRouter
visit.push(src);
WireId cursor;
while (true) {
if (visit.empty() || visit.size() > 50000) {
if (allow_fail)
return false;
log_error("cannot route global from %s to %s.\n", ctx->getWireName(src).c_str(ctx),
ctx->getWireName(dst).c_str(ctx));
}
cursor = visit.back();
cursor = visit.front();
visit.pop();
NetInfo *bound = ctx->getBoundWireNet(cursor);
if (ctx->verbose)
log_info(" exploring %s\n", ctx->getWireName(cursor).c_str(ctx));
if (bound == net) {
break;
} else if (bound != nullptr) {
continue;
}
@ -216,6 +218,8 @@ class Ecp5GlobalRouter
break;
for (auto dh : ctx->getPipsDownhill(cursor)) {
WireId pipDst = ctx->getPipDstWire(dh);
if (ctx->verbose)
log_info(" downhill -> %s\n", ctx->getWireName(pipDst).c_str(ctx));
if (backtrace.count(pipDst))
continue;
backtrace[pipDst] = dh;
@ -226,9 +230,16 @@ class Ecp5GlobalRouter
auto fnd = backtrace.find(cursor);
if (fnd == backtrace.end())
break;
NetInfo * bound = ctx->getBoundWireNet(cursor);
if (bound != nullptr) {
NPNR_ASSERT(bound == net);
break;
}
ctx->bindPip(fnd->second, net, STRENGTH_LOCKED);
cursor = ctx->getPipSrcWire(fnd->second);
}
if (ctx->getBoundWireNet(src) == nullptr)
ctx->bindWire(src, net, STRENGTH_LOCKED);
return true;
}
@ -294,7 +305,7 @@ class Ecp5GlobalRouter
public:
void promote_and_route_globals() {
log_info("Promoting and routing globals...");
log_info("Promoting and routing globals...\n");
auto clocks = get_clocks();
int glbid = 0;
for (auto clock : clocks) {