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authorPeter Maydell <peter.maydell@linaro.org>2010-12-07 15:37:34 +0000
committerPeter Maydell <peter.maydell@linaro.org>2010-12-07 15:37:34 +0000
commit09d9487fbb5c17226762e73c2b7d84170f5bd092 (patch)
tree328a1ea37a3bdc3a1f1d32035af6c19a7bb205a2
parent21d6ebde76e9e7a89f5d2100816aac920cae109c (diff)
downloadqemu-arm-09d9487fbb5c17226762e73c2b7d84170f5bd092.tar.gz
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>
-rw-r--r--target-arm/helper.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 2a1f44860b..6d2a8f2ad9 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -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)); \