From dda3ec490cf6a5927a9c6829654481101bfeda61 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 14 Mar 2011 15:37:12 +0000 Subject: [PATCH] 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 Signed-off-by: Aurelien Jarno --- target-arm/helper.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 4f2b44036f..6c0e59f15a 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -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); } +#define float32_two make_float32(0x40000000) + float32 HELPER(recps_f32)(float32 a, float32 b, CPUState *env) { - float_status *s = &env->vfp.fp_status; - float32 two = int32_to_float32(2, s); - return float32_sub(two, float32_mul(a, b, s), s); + float_status *s = &env->vfp.standard_fp_status; + if ((float32_is_infinity(a) && float32_is_zero_or_denormal(b)) || + (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) -- GitLab