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target-arm: Don't set FP exceptions in recip, recip_sqrt estimate fns

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The functions which do the core estimation algorithms for the VRSQRTE
and VRECPE instructions should not set floating point exception flags,
so use a local fp status for doing these calculations.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-05-19 14:46:14 +01:00 committed by Aurelien Jarno
parent 8c11ad25f4
commit 1146a817c1
1 changed files with 10 additions and 2 deletions
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12
target-arm/helper.c
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@ -2749,7 +2749,11 @@ float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env)
*/
static float64 recip_estimate(float64 a, CPUState *env)
{
float_status *s = &env->vfp.standard_fp_status;
/* These calculations mustn't set any fp exception flags,
* so we use a local copy of the fp_status.
*/
float_status dummy_status = env->vfp.standard_fp_status;
float_status *s = &dummy_status;
/* q = (int)(a * 512.0) */
float64 q = float64_mul(float64_512, a, s);
int64_t q_int = float64_to_int64_round_to_zero(q, s);
@ -2812,7 +2816,11 @@ float32 HELPER(recpe_f32)(float32 a, CPUState *env)
*/
static float64 recip_sqrt_estimate(float64 a, CPUState *env)
{
float_status *s = &env->vfp.standard_fp_status;
/* These calculations mustn't set any fp exception flags,
* so we use a local copy of the fp_status.
*/
float_status dummy_status = env->vfp.standard_fp_status;
float_status *s = &dummy_status;
float64 q;
int64_t q_int;