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| author | Peter Maydell <peter.maydell@linaro.org> | 2011-03-14 15:37:12 +0000 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-03-22 07:59:06 +0100 |
| commit | dda3ec490cf6a5927a9c6829654481101bfeda61 (patch) | |
| tree | 588d8a5e8082a45e7526b62446d72c29a618dd15 /target-arm/helper.c | |
| parent | 7d2aabe262846ddeda1785d42ff4d7964e8ac1c8 (diff) | |
| download | qemu-dda3ec490cf6a5927a9c6829654481101bfeda61.tar.gz | |
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>
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 11 |
1 files 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) |