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target-arm: Fix VRECPS edge cases handling 

Correct the handling of edge cases for the VRECPS instruction:
 * this is a Neon instruction so uses the "standard FPSCR value"
 * (zero, inf) is a special case which returns 2.0

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 15:37:12 +00:00 committed by Aurelien Jarno
parent 7d2aabe262
commit dda3ec490c
1 changed files with 8 additions and 3 deletions
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11
target-arm/helper.c
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@ -2707,11 +2707,16 @@ uint32_t HELPER(vfp_fcvt_f32_to_f16)(float32 a, CPUState *env)
return do_fcvt_f32_to_f16(a, env, &env->vfp.fp_status); return do_fcvt_f32_to_f16(a, env, &env->vfp.fp_status);
} }
#define float32_two make_float32(0x40000000)
float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env) float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env)
{ {
float_status *s = &env->vfp.fp_status; float_status *s = &env->vfp.standard_fp_status;
float32 two = int32_to_float32(2, s); if ((float32_is_infinity(a) && float32_is_zero_or_denormal(b)) ||
return float32_sub(two, float32_mul(a, b, s), s); (float32_is_infinity(b) && float32_is_zero_or_denormal(a))) {
return float32_two;
}
return float32_sub(float32_two, float32_mul(a, b, s), s);
} }
float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env) float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env)