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target/arm: Improve arm_rmode_to_sf 

Use proper enumeration types for input and output.
Use a const array to perform the mapping, with an
assert that the input is valid.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-02-25 10:48:08 -10:00
parent ab9ced73fa
commit 6ce21abd40
3 changed files with 18 additions and 29 deletions
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12
target/arm/internals.h
View File

@ -193,16 +193,22 @@ void arm_restore_state_to_opc(CPUState *cs,
void arm_cpu_synchronize_from_tb(CPUState *cs, const TranslationBlock *tb);
#endif /* CONFIG_TCG */
enum arm_fprounding {
typedef enum ARMFPRounding {
FPROUNDING_TIEEVEN,
FPROUNDING_POSINF,
FPROUNDING_NEGINF,
FPROUNDING_ZERO,
FPROUNDING_TIEAWAY,
FPROUNDING_ODD
};
} ARMFPRounding;
int arm_rmode_to_sf(int rmode);
extern const FloatRoundMode arm_rmode_to_sf_map[6];
static inline FloatRoundMode arm_rmode_to_sf(ARMFPRounding rmode)
{
assert((unsigned)rmode < ARRAY_SIZE(arm_rmode_to_sf_map));
return arm_rmode_to_sf_map[rmode];
}
static inline void aarch64_save_sp(CPUARMState *env, int el)
{

2
target/arm/tcg/translate-mve.c
View File

@ -588,7 +588,7 @@ DO_VCVT(VCVT_FS, vcvt_hs, vcvt_fs)
DO_VCVT(VCVT_FU, vcvt_hu, vcvt_fu)
static bool do_vcvt_rmode(DisasContext *s, arg_1op *a,
enum arm_fprounding rmode, bool u)
ARMFPRounding rmode, bool u)
{
/*
* Handle VCVT fp to int with specified rounding mode.

33
target/arm/vfp_helper.c
View File

@ -1104,31 +1104,14 @@ float64 HELPER(rintd)(float64 x, void *fp_status)
}
/* Convert ARM rounding mode to softfloat */
int arm_rmode_to_sf(int rmode)
{
switch (rmode) {
case FPROUNDING_TIEAWAY:
rmode = float_round_ties_away;
break;
case FPROUNDING_ODD:
rmode = float_round_to_odd;
break;
case FPROUNDING_TIEEVEN:
default:
rmode = float_round_nearest_even;
break;
case FPROUNDING_POSINF:
rmode = float_round_up;
break;
case FPROUNDING_NEGINF:
rmode = float_round_down;
break;
case FPROUNDING_ZERO:
rmode = float_round_to_zero;
break;
}
return rmode;
}
const FloatRoundMode arm_rmode_to_sf_map[] = {
[FPROUNDING_TIEEVEN] = float_round_nearest_even,
[FPROUNDING_POSINF] = float_round_up,
[FPROUNDING_NEGINF] = float_round_down,
[FPROUNDING_ZERO] = float_round_to_zero,
[FPROUNDING_TIEAWAY] = float_round_ties_away,
[FPROUNDING_ODD] = float_round_to_odd,
};
/*
* Implement float64 to int32_t conversion without saturation;