diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2010-12-07 15:37:34 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2010-12-07 15:37:34 +0000 |
| commit | 2d6277373d3fc18f11504cd05ea82f0fe6d67962 (patch) | |
| tree | 79cd0a50165399bf9f87890e1a1965363304d682 /target-arm/helper.c | |
| parent | b408dbdec3d3220b7e2da2b0fd768048f43a2e39 (diff) | |
ARM: Return correct result for single<->double conversion of NaN
The ARM ARM defines that if the input to a single<->double conversion
is a NaN then the output is always forced to be a quiet NaN by setting
the most significant bit of the fraction part.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 6d2a8f2ad9..4bd1cd4fa4 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -2528,12 +2528,20 @@ float32 VFP_HELPER(tosiz, d)(float64 x, CPUState *env) /* floating point conversion */ float64 VFP_HELPER(fcvtd, s)(float32 x, CPUState *env) { - return float32_to_float64(x, &env->vfp.fp_status); + float64 r = float32_to_float64(x, &env->vfp.fp_status); + /* ARM requires that S<->D conversion of any kind of NaN generates + * a quiet NaN by forcing the most significant frac bit to 1. + */ + return float64_maybe_silence_nan(r); } float32 VFP_HELPER(fcvts, d)(float64 x, CPUState *env) { - return float64_to_float32(x, &env->vfp.fp_status); + float32 r = float64_to_float32(x, &env->vfp.fp_status); + /* ARM requires that S<->D conversion of any kind of NaN generates + * a quiet NaN by forcing the most significant frac bit to 1. + */ + return float32_maybe_silence_nan(r); } /* VFP3 fixed point conversion. */ |