@@ -397,14 +397,26 @@ uint32_t HELPER(cxb)(CPUS390XState *env, uint64_t ah, uint64_t al,
int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3)
{
int ret = env->fpu_status.float_rounding_mode;
+
switch (m3) {
case 0:
/* current mode */
break;
case 1:
- /* biased round no nearest */
+ /* round to nearest with ties away from 0 */
+ set_float_rounding_mode(float_round_ties_away, &env->fpu_status);
+ break;
+ case 3:
+ /*
+ * round to prepare for shorter precision
+ *
+ * FIXME: we actually want something like round_to_odd, but that
+ * does not support all data types yet.
+ */
+ set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
+ break;
case 4:
- /* round to nearest */
+ /* round to nearest with ties to even */
set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
break;
case 5:
@@ -419,6 +431,8 @@ int s390_swap_bfp_rounding_mode(CPUS390XState *env, int m3)
/* round to -inf */
set_float_rounding_mode(float_round_down, &env->fpu_status);
break;
+ default:
+ g_assert_not_reached();
}
return ret;
}