From e5a5de53c1e0146582742202e702e98748899b75 Mon Sep 17 00:00:00 2001
From: Lofty <dan.ravensloft@gmail.com>
Date: Thu, 25 May 2023 17:53:45 +0100
Subject: [PATCH] mistral: fallback to guess if simulator has no waveform

---
 mistral/delay.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mistral/delay.cc b/mistral/delay.cc
index 5b13820f..19fa2237 100644
--- a/mistral/delay.cc
+++ b/mistral/delay.cc
@@ -368,8 +368,9 @@ bool Arch::getArcDelayOverride(const NetInfo *net_info, const PortRef &sink, Del
             cyclonev->rnode_timing_build_input_wave(src.node, temp, CycloneV::DELAY_MAX,
                                                     inverted ? mistral::CycloneV::RF_RISE : mistral::CycloneV::RF_FALL,
                                                     est, input_wave[1]);
-            NPNR_ASSERT(!input_wave[mistral::CycloneV::RF_RISE].empty() &&
-                        !input_wave[mistral::CycloneV::RF_FALL].empty());
+            if (input_wave[mistral::CycloneV::RF_RISE].empty() ||
+                    input_wave[mistral::CycloneV::RF_FALL].empty())
+                return false;
         }
 
         for (int edge = 0; edge != 2; edge++) {