Update test case to provoke bug.

tests/plat/core/and_e.e

@@ -8,6 +8,8 @@ three
 	rom 3
 one
 	rom 1
+mone
+	rom -1
 big
 	rom 256
 
@@ -81,5 +83,33 @@ big
     asp 4
 5
 
+	/* And big const with negative var */
+
+	loc 257
+	loe mone
+	and EM_WSIZE
+	loc 257
+	cmu EM_WSIZE
+	zeq *6
+
+    loc __LINE__
+    cal $fail
+    asp 4
+6
+
+	/* And big var with negative const */
+
+	loe big
+	loc -1
+	and EM_WSIZE
+	loe big
+	cmu EM_WSIZE
+	zeq *7
+
+    loc __LINE__
+    cal $fail
+    asp 4
+7
+
     cal $finished
     end

tests/plat/core/ior_e.e

@@ -8,6 +8,10 @@ zero
 	rom 0
 one
 	rom 1
+mone
+	rom -1
+big
+	rom 257
 
 	/* Or var with var */
 
@@ -79,5 +83,33 @@ one
     asp 4
 5
 
+	/* Or big const with negative var */
+
+	loc 1000
+	loe mone
+	ior EM_WSIZE
+	loc -1
+	cmu EM_WSIZE
+	zeq *6
+
+    loc __LINE__
+    cal $fail
+    asp 4
+6
+
+	/* Or big var with negative const */
+
+	loe big
+	loc -1
+	ior EM_WSIZE
+	loe big
+	cmu EM_WSIZE
+	zeq *7
+
+    loc __LINE__
+    cal $fail
+    asp 4
+7
+
     cal $finished
     end

tests/plat/core/xor_e.e

@@ -8,6 +8,10 @@ three
 	rom 3
 one
 	rom 1
+mone
+	rom -1
+big
+	rom 1001
 
 	/* Xor var with var */
 
@@ -79,5 +83,34 @@ one
     asp 4
 5
 
+	/* Xor big const with negative var */
+
+	loc 1001
+	loe mone
+	xor EM_WSIZE
+	loc -1002
+	cmu EM_WSIZE
+	zeq *6
+
+    loc __LINE__
+    cal $fail
+    asp 4
+6
+
+	/* Xor big var with negative const */
+
+	loe big
+	loc -1
+	xor EM_WSIZE
+	loc -1002
+	cmu EM_WSIZE
+	zeq *7
+
+    loc __LINE__
+    cal $fail
+    asp 4
+7
+
+
     cal $finished
     end