branch instructions tweaks

PDP11/test.c

@@ -171,8 +171,16 @@ void emit_branch_instructions(json_t *const target, int *const id)
 	printf("Branch instructions\n");
 	for(int group=0; group<2; group++) {
 		for(int bt=0; bt<8; bt++) {
+			if (group == 0 && bt == 0)  // SWAB
+				continue;
+			for(int direction=0; direction<4; direction++) {
 				uint16_t instr = (group << 15) | (bt << 8);
 
+				if (direction & 2)
+					instr |= 62 + (direction & 1);
+				else
+					instr |= 218 + (direction & 1);
+
 				for(int psw_val=0; psw_val<16; psw_val++) {
 					init_simh();
 
@@ -194,6 +202,7 @@ void emit_branch_instructions(json_t *const target, int *const id)
 				}
 			}
 		}
+	}
 }
 
 void emit_condition_sets(json_t *const target, int *const id)
@@ -270,7 +279,7 @@ void produce_validation_tests()
 
 	emit_condition_sets(out, &id);
 
-	emit_add_sub(out, &id);
+//	emit_add_sub(out, &id);
 
 	FILE *fh = fopen("testset.json", "w");
 	json_dumpf(out, fh, JSON_INDENT(2));