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ARM: Return correct result for float-to-integer conversion of NaN 

The ARM architecture mandates that converting a NaN value to
integer gives zero (if Invalid Operation FP exceptions are
not being trapped). This isn't the behaviour of the SoftFloat
library, so NaNs must be special-cased.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
This commit is contained in:
Peter Maydell 2010-12-07 15:37:34 +00:00
parent 21d6ebde76
commit 09d9487fbb
1 changed files with 27 additions and 0 deletions
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27
target-arm/helper.c
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@ -2463,41 +2463,65 @@ float64 VFP_HELPER(sito, d)(float32 x, CPUState *env)
/* Float to integer conversion. */
float32 VFP_HELPER(toui, s)(float32 x, CPUState *env)
{
if (float32_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float32_to_uint32(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(toui, d)(float64 x, CPUState *env)
{
if (float64_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float64_to_uint32(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(tosi, s)(float32 x, CPUState *env)
{
if (float32_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float32_to_int32(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(tosi, d)(float64 x, CPUState *env)
{
if (float64_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float64_to_int32(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(touiz, s)(float32 x, CPUState *env)
{
if (float32_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float32_to_uint32_round_to_zero(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(touiz, d)(float64 x, CPUState *env)
{
if (float64_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float64_to_uint32_round_to_zero(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(tosiz, s)(float32 x, CPUState *env)
{
if (float32_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float32_to_int32_round_to_zero(x, &env->vfp.fp_status));
}
float32 VFP_HELPER(tosiz, d)(float64 x, CPUState *env)
{
if (float64_is_any_nan(x)) {
return float32_zero;
}
return vfp_itos(float64_to_int32_round_to_zero(x, &env->vfp.fp_status));
}
@ -2524,6 +2548,9 @@ ftype VFP_HELPER(name##to, p)(ftype x, uint32_t shift, CPUState *env) \
ftype VFP_HELPER(to##name, p)(ftype x, uint32_t shift, CPUState *env) \
{ \
ftype tmp; \
if (ftype##_is_any_nan(x)) { \
return ftype##_zero; \
} \
tmp = ftype##_scalbn(x, shift, &env->vfp.fp_status); \
return vfp_ito##p((itype)ftype##_to_##sign##int32_round_to_zero(tmp, \
&env->vfp.fp_status)); \