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[PATCH 1/7] target/alpha: Use array for FPCR_DYN conversion
From: |
Richard Henderson |
Subject: |
[PATCH 1/7] target/alpha: Use array for FPCR_DYN conversion |
Date: |
Fri, 20 Sep 2019 21:32:50 -0700 |
This is a bit more straight-forward than using a switch statement.
No functional change.
Signed-off-by: Richard Henderson <address@hidden>
---
target/alpha/helper.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/target/alpha/helper.c b/target/alpha/helper.c
index 19cda0a2db..6c1703682e 100644
--- 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;
--
2.17.1