From: Peter Maydell Date: Thu, 19 May 2011 13:46:14 +0000 (+0100) Subject: target-arm: Don't set FP exceptions in recip, recip_sqrt estimate fns X-Git-Tag: v0.15.0-rc0~250 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=1146a817c1c46f298492188e5269b98f3a0e51e8;p=qemu.git target-arm: Don't set FP exceptions in recip, recip_sqrt estimate fns 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 Signed-off-by: Aurelien Jarno --- diff --git a/target-arm/helper.c b/target-arm/helper.c index 62ae72ec2..5ff6a9bdb 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -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;