From 3472f91129a7a594b356f9a22af2a8176f6e4b1c Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Sat, 9 Aug 2014 22:47:46 +0200
Subject: 5a: reject MOVM instruction with .S and .W bits both set (aijus idea)

---
 sys/src/cmd/5a/lex.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sys/src/cmd/5a/lex.c b/sys/src/cmd/5a/lex.c
index e052ce284..89ff6661c 100644
--- a/sys/src/cmd/5a/lex.c
+++ b/sys/src/cmd/5a/lex.c
@@ -563,6 +563,13 @@ outcode(int a, int scond, Gen *g1, int reg, Gen *g2)
 		scond = (scond & ~0xf) | Always;
 	}
 
+	if(a == AMOVM){
+		if((scond & (C_SBIT|C_WBIT)) == (C_SBIT|C_WBIT)){
+			yyerror("MOVM .S and .W are exclusive");
+			errorexit();
+		}
+	}
+
 	if(pass == 1)
 		goto out;
 jackpot:
-- 
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