From f5ed23867fc4a4f90440883f156862f408f56cb0 Mon Sep 17 00:00:00 2001
From: Olaf Seibert <rhialto@falu.nl>
Date: Mon, 27 Apr 2015 23:20:16 +0200
Subject: [PATCH] Fix bad code generation

multiple modifications of the same variable between sequence
points leads to undefined behaviour.
---
 src/kn10def.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/kn10def.h b/src/kn10def.h
index 99b5d18..66e7770 100644
--- a/src/kn10def.h
+++ b/src/kn10def.h
@@ -235,7 +235,8 @@ typedef int     pcinc_t;	/* Type of all instruction routines */
 #if KLH10_EXTADR
 # define PC_ADDXCT(x) { register pcinc_t i__ = (x); if (i__) PC_ADD(i__); }
 #else
-# define PC_ADDXCT(x) (cpu.mr_PC += (x))	/* For now; fix up later? */
+# define PC_ADDXCT(x) { volatile pcinc_t i__ = (x); cpu.mr_PC += i__; }
+/*# define PC_ADDXCT(x) (cpu.mr_PC += (x))	/ * For now; fix up later? */
 #endif
 
 /* Macros for putting PC into a word.