From 2b3a148fc41f77e6933a97c964fb610d9dc313ab Mon Sep 17 00:00:00 2001
From: Anhijkt <mihail.ershov.zp@gmail.com>
Date: Sat, 5 Apr 2025 13:46:38 +0300
Subject: [PATCH] ice40_dsp: fix const handling

---
 techlibs/ice40/ice40_dsp.pmg | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/techlibs/ice40/ice40_dsp.pmg b/techlibs/ice40/ice40_dsp.pmg
index 63bc8de4b..2cfb97b2a 100644
--- a/techlibs/ice40/ice40_dsp.pmg
+++ b/techlibs/ice40/ice40_dsp.pmg
@@ -32,8 +32,8 @@ code sigA sigB sigH
 		++i;
 		return sig.extract(0, i);
 	};
-	sigA = unextend(port(mul, \A));
-	sigB = unextend(port(mul, \B));
+	sigA = port(mul, \A).is_fully_const() ? port(mul, \A) : unextend(port(mul, \A));
+	sigB = port(mul, \B).is_fully_const() ? port(mul, \B) : unextend(port(mul, \B));
 
 	SigSpec O;
 	if (mul->type == $mul)