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target-arm: use make_float32() to make constant floats for VRSQRTS

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The preferred way to create a constant floating point value is to use
make_float32() rather than doing a runtime int32_to_float32().
Convert the code in the VRSQRTS helper to work this way.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-03-14 15:37:13 +00:00 committed by Aurelien Jarno
parent dda3ec490c
commit 6aae3df15d
1 changed files with 5 additions and 6 deletions
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11
target-arm/helper.c
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@ -2708,6 +2708,8 @@ uint32_t HELPER(vfp_fcvt_f32_to_f16)(float32 a, CPUState *env)
}
#define float32_two make_float32(0x40000000)
#define float32_three make_float32(0x40400000)
#define float32_one_point_five make_float32(0x3fc00000)
float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env)
{
@ -2722,16 +2724,13 @@ float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env)
float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env)
{
float_status *s = &env->vfp.standard_fp_status;
float32 two = int32_to_float32(2, s);
float32 three = int32_to_float32(3, s);
float32 product;
if ((float32_is_infinity(a) && float32_is_zero_or_denormal(b)) ||
(float32_is_infinity(b) && float32_is_zero_or_denormal(a))) {
product = float32_zero;
} else {
product = float32_mul(a, b, s);
return float32_one_point_five;
}
return float32_div(float32_sub(three, product, s), two, s);
product = float32_mul(a, b, s);
return float32_div(float32_sub(float32_three, product, s), float32_two, s);
}
/* NEON helpers. */