From 5954767b0b4da0c43f7194c7def4c162fbc8ef78 Mon Sep 17 00:00:00 2001
From: Matthew Daniels <108370479+gm-matthew@users.noreply.github.com>
Date: Fri, 21 Mar 2025 18:02:43 +0000
Subject: [PATCH] i960: don't preserve sign bit when shifting integer left
 (#13507)

---
 src/devices/cpu/i960/i960.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/devices/cpu/i960/i960.cpp b/src/devices/cpu/i960/i960.cpp
index 7d31ad031bf..40bda560f40 100644
--- a/src/devices/cpu/i960/i960.cpp
+++ b/src/devices/cpu/i960/i960.cpp
@@ -1157,7 +1157,7 @@ void i960_cpu_device::execute_op(uint32_t opcode)
 				m_icount--;
 				t1 = get_1_ri(opcode);
 				t2 = get_2_ri(opcode);
-				set_ri(opcode, (t2 & 0x80000000) | (t1 >= 32 ? 0 : (t2<<t1) & 0x7fffffff)); // sign is preserved
+				set_ri(opcode, t1 >= 32 ? 0 : ((int32_t)t2) << t1);
 				break;
 
 			default: