From 6692e5d558e7c7277153b7a3bd1623af0e57405d Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Fri, 17 Jan 2020 15:28:02 -0800
Subject: ice40_dsp: tolerant of fanout-less outputs, as well as all-zero
inputs
---
passes/pmgen/ice40_dsp.pmg | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/passes/pmgen/ice40_dsp.pmg b/passes/pmgen/ice40_dsp.pmg
index 6b6d2b56f..9514e65d9 100644
--- a/passes/pmgen/ice40_dsp.pmg
+++ b/passes/pmgen/ice40_dsp.pmg
@@ -57,6 +57,9 @@ code sigA sigB sigH
sigH.append(O[i]);
}
log_assert(nusers(O.extract_end(i)) <= 1);
+
+ if (sigH.empty())
+ reject;
endcode
code argQ ffA ffAholdmux ffArstmux ffAholdpol ffArstpol sigA clock clock_pol
@@ -328,6 +331,8 @@ arg argD argQ clock clock_pol
code
dff = nullptr;
+ if (argQ.empty())
+ reject;
for (auto c : argQ.chunks()) {
if (!c.wire)
reject;
--
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