From 60793266334639144a9a5f8b7b0855c811ccd087 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Wed, 18 Jan 2023 16:28:33 +0100
Subject: context: Add getNetinfoRouteDelayQuad

Signed-off-by: gatecat <gatecat@ds0.me>
---
 common/kernel/context.cc | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 common/kernel/context.h  |  1 +
 common/kernel/sdf.cc     |  2 +-
 3 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/common/kernel/context.cc b/common/kernel/context.cc
index 014394a6..821ad822 100644
--- a/common/kernel/context.cc
+++ b/common/kernel/context.cc
@@ -157,6 +157,53 @@ delay_t Context::getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &us
     return max_delay;
 }
 
+DelayQuad Context::getNetinfoRouteDelayQuad(const NetInfo *net_info, const PortRef &user_info) const
+{
+#ifdef ARCH_ECP5
+    if (net_info->is_global)
+        return DelayQuad(0);
+#endif
+
+    if (net_info->wires.empty())
+        return DelayQuad(predictArcDelay(net_info, user_info));
+
+    WireId src_wire = getNetinfoSourceWire(net_info);
+    if (src_wire == WireId())
+        return DelayQuad(0);
+
+    DelayQuad result(std::numeric_limits<delay_t>::max(), std::numeric_limits<delay_t>::lowest());
+
+    for (auto dst_wire : getNetinfoSinkWires(net_info, user_info)) {
+        WireId cursor = dst_wire;
+        DelayQuad delay{0};
+
+        while (cursor != WireId() && cursor != src_wire) {
+            auto it = net_info->wires.find(cursor);
+
+            if (it == net_info->wires.end())
+                break;
+
+            PipId pip = it->second.pip;
+            if (pip == PipId())
+                break;
+
+            delay = delay + getPipDelay(pip);
+            delay = delay + getWireDelay(cursor);
+            cursor = getPipSrcWire(pip);
+        }
+
+        if (cursor == src_wire)
+            delay = delay + getWireDelay(src_wire);
+        else
+            delay = DelayQuad(predictArcDelay(net_info, user_info)); // unrouted
+        result.rise.min_delay = std::min(result.rise.min_delay, delay.rise.min_delay);
+        result.rise.max_delay = std::max(result.rise.max_delay, delay.rise.max_delay);
+        result.fall.min_delay = std::min(result.fall.min_delay, delay.fall.min_delay);
+        result.fall.max_delay = std::max(result.fall.max_delay, delay.fall.max_delay);
+    }
+    return result;
+}
+
 static uint32_t xorshift32(uint32_t x)
 {
     x ^= x << 13;
diff --git a/common/kernel/context.h b/common/kernel/context.h
index 4a5667d0..b4e7920d 100644
--- a/common/kernel/context.h
+++ b/common/kernel/context.h
@@ -58,6 +58,7 @@ struct Context : Arch, DeterministicRNG
     size_t getNetinfoSinkWireCount(const NetInfo *net_info, const PortRef &sink) const;
     WireId getNetinfoSinkWire(const NetInfo *net_info, const PortRef &sink, size_t phys_idx) const;
     delay_t getNetinfoRouteDelay(const NetInfo *net_info, const PortRef &sink) const;
+    DelayQuad getNetinfoRouteDelayQuad(const NetInfo *net_info, const PortRef &sink) const;
 
     // provided by router1.cc
     bool checkRoutedDesign() const;
diff --git a/common/kernel/sdf.cc b/common/kernel/sdf.cc
index acff56ed..eb547ff2 100644
--- a/common/kernel/sdf.cc
+++ b/common/kernel/sdf.cc
@@ -324,7 +324,7 @@ void Context::writeSDF(std::ostream &out, bool cvc_mode) const
             ic.to.cell = usr.cell->name.str(this);
             ic.to.port = usr.port.str(this);
             // FIXME: min/max routing delay
-            ic.delay = convert_delay(DelayQuad(getNetinfoRouteDelay(ni, usr)));
+            ic.delay = convert_delay(getNetinfoRouteDelayQuad(ni, usr));
             wr.conn.push_back(ic);
         }
     }
-- 
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