target/s390x: Extract s390_get_bfp_rounding_mode()

For DIVIDE TO INTEGER it will be helpful to pass final-quotient
rounding mode around explicitly rather than setting it in fpu_status
implicitly. To facilitate this, extract a function for converting the
mask to the rounding mode.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20260210214044.1174699-3-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

diff --git a/target/s390x/tcg/fpu_helper.c b/target/s390x/tcg/fpu_helper.c
index 1ba43715ac1713637f5365689ec61cc56df3b2cf..7a3ff501a46e4c096a682a0bdd57e0263e90c033 100644 (file)
--- a/target/s390x/tcg/fpu_helper.c
+++ b/target/s390x/tcg/fpu_helper.c
@@ -56,6 +56,35 @@ uint8_t s390_softfloat_exc_to_ieee(unsigned int exc)
     return s390_exc;
 }
 
+static int s390_get_bfp_rounding_mode(CPUS390XState *env, int m3)
+{
+    switch (m3) {
+    case 0:
+        /* current mode */
+        return env->fpu_status.float_rounding_mode;
+    case 1:
+        /* round to nearest with ties away from 0 */
+        return float_round_ties_away;
+    case 3:
+        /* round to prepare for shorter precision */
+        return float_round_to_odd;
+    case 4:
+        /* round to nearest with ties to even */
+        return float_round_nearest_even;
+    case 5:
+        /* round to zero */
+        return float_round_to_zero;
+    case 6:
+        /* round to +inf */
+        return float_round_up;
+    case 7:
+        /* round to -inf */
+        return float_round_down;
+    default:
+        g_assert_not_reached();
+    }
+}
+
 /* Should be called after any operation that may raise IEEE exceptions.  */
 static void handle_exceptions(CPUS390XState *env, bool XxC, uintptr_t retaddr)
 {
@@ -416,37 +445,8 @@ 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:
-        /* 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 */
-        set_float_rounding_mode(float_round_to_odd, &env->fpu_status);
-        break;
-    case 4:
-        /* round to nearest with ties to even */
-        set_float_rounding_mode(float_round_nearest_even, &env->fpu_status);
-        break;
-    case 5:
-        /* round to zero */
-        set_float_rounding_mode(float_round_to_zero, &env->fpu_status);
-        break;
-    case 6:
-        /* round to +inf */
-        set_float_rounding_mode(float_round_up, &env->fpu_status);
-        break;
-    case 7:
-        /* round to -inf */
-        set_float_rounding_mode(float_round_down, &env->fpu_status);
-        break;
-    default:
-        g_assert_not_reached();
-    }
+    set_float_rounding_mode(s390_get_bfp_rounding_mode(env, m3),
+                            &env->fpu_status);
     return ret;
 }