From 39d33a065a643770da979cf9c0ef5c1da28771cc Mon Sep 17 00:00:00 2001
From: fridtjof <fridtjof@das-labor.org>
Date: Fri, 22 Aug 2025 01:15:55 +0200
Subject: [PATCH] tests: add cmp register width confusion test

---
 tests/tcg/cr16c/test04-cmps.S | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/tcg/cr16c/test04-cmps.S b/tests/tcg/cr16c/test04-cmps.S
index 817f0b840b..75a22acfc8 100644
--- a/tests/tcg/cr16c/test04-cmps.S
+++ b/tests/tcg/cr16c/test04-cmps.S
@@ -363,5 +363,13 @@ _start:
 	EXPECTD 0x87654321, r13
 	RESET
 
+
+	/* CMPd register width confusion */
+	MOVD $0x7fff1234, (r1,r0) /* r0 = 0x1234, r1 = 0x7fff */
+	MOVD $0, (r12)
+	cmpd (r12), (r1,r0) /* this should obviously not affect any of the pair registers */
+	cmpw r1, r0 /* this should set PSR.N and PSR.L (because r1 > r0) */
+	EXPECT_COND gt
+
 	ENDING
 	FAIL_HANDLER