yuzu/unicorn
1
0
Fork 0
mirror of https://github.com/yuzu-emu/unicorn.git synced 2025-02-02 09:01:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

fpu/softfloat: Introduce parts_is_snan_frac

Browse source 
Backports commit 298b468e4389587ab2e8599dd33eff3fbc698011 from qemu
This commit is contained in:
Richard Henderson 2018-05-19 22:20:00 -04:00 committed by Lioncash
parent f89c1fc034
commit 97152bc427
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 17 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
qemu/fpu/softfloat-specialize.h
View file

@ -86,6 +86,21 @@ this code that are retained.
#define NO_SIGNALING_NANS 1 #define NO_SIGNALING_NANS 1
#endif #endif
/*----------------------------------------------------------------------------
| For the deconstructed floating-point with fraction FRAC, return true
| if the fraction represents a signalling NaN; otherwise false.
*----------------------------------------------------------------------------*/
static bool parts_is_snan_frac(uint64_t frac, float_status *status)
{
#ifdef NO_SIGNALING_NANS
return false;
#else
flag msb = extract64(frac, DECOMPOSED_BINARY_POINT - 1, 1);
return msb == status->snan_bit_is_one;
#endif
}
/*---------------------------------------------------------------------------- /*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN. | The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/ *----------------------------------------------------------------------------*/

12
qemu/fpu/softfloat.c
View file

@ -331,16 +331,8 @@ static FloatParts canonicalize(FloatParts part, const FloatFmt *parm,
part.cls = float_class_inf; part.cls = float_class_inf;
} else { } else {
part.frac <<= parm->frac_shift; part.frac <<= parm->frac_shift;
#ifdef NO_SIGNALING_NANS part.cls = (parts_is_snan_frac(part.frac, status)
part.cls = float_class_qnan; ? float_class_snan : float_class_qnan);
#else
int64_t msb = part.frac << 2;
if ((msb < 0) == status->snan_bit_is_one) {
part.cls = float_class_snan;
} else {
part.cls = float_class_qnan;
}
#endif
} }
} else if (part.exp == 0) { } else if (part.exp == 0) {
if (likely(part.frac == 0)) { if (likely(part.frac == 0)) {