target/alpha: Use array for FPCR_DYN conversion

This is a bit more straight-forward than using a switch statement.
No functional change.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190921043256.4575-2-richard.henderson@linaro.org>

diff --git a/target/alpha/helper.c b/target/alpha/helper.c
index 19cda0a2db568d16d72656273d5e4801a4647618..6c1703682e0eacab970ed7f1634d8e417ed82039 100644 (file)
--- a/target/alpha/helper.c
+++ b/target/alpha/helper.c
@@ -36,6 +36,13 @@ uint64_t cpu_alpha_load_fpcr(CPUAlphaState *env)
 
 void cpu_alpha_store_fpcr(CPUAlphaState *env, uint64_t val)
 {
+    static const uint8_t rm_map[] = {
+        [FPCR_DYN_NORMAL >> FPCR_DYN_SHIFT] = float_round_nearest_even,
+        [FPCR_DYN_CHOPPED >> FPCR_DYN_SHIFT] = float_round_to_zero,
+        [FPCR_DYN_MINUS >> FPCR_DYN_SHIFT] = float_round_down,
+        [FPCR_DYN_PLUS >> FPCR_DYN_SHIFT] = float_round_up,
+    };
+
     uint32_t fpcr = val >> 32;
     uint32_t t = 0;
 
@@ -48,22 +55,7 @@ void cpu_alpha_store_fpcr(CPUAlphaState *env, uint64_t val)
     env->fpcr = fpcr;
     env->fpcr_exc_enable = ~t & FPCR_STATUS_MASK;
 
-    switch (fpcr & FPCR_DYN_MASK) {
-    case FPCR_DYN_NORMAL:
-    default:
-        t = float_round_nearest_even;
-        break;
-    case FPCR_DYN_CHOPPED:
-        t = float_round_to_zero;
-        break;
-    case FPCR_DYN_MINUS:
-        t = float_round_down;
-        break;
-    case FPCR_DYN_PLUS:
-        t = float_round_up;
-        break;
-    }
-    env->fpcr_dyn_round = t;
+    env->fpcr_dyn_round = rm_map[(fpcr & FPCR_DYN_MASK) >> FPCR_DYN_SHIFT];
 
     env->fpcr_flush_to_zero = (fpcr & FPCR_UNFD) && (fpcr & FPCR_UNDZ);
     env->fp_status.flush_inputs_to_zero = (fpcr & FPCR_DNZ) != 0;