diff options
Diffstat (limited to 'newlib/libm/machine/spu/headers/recipd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/recipd2.h | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/newlib/libm/machine/spu/headers/recipd2.h b/newlib/libm/machine/spu/headers/recipd2.h index 463769db4..21e00c6be 100644 --- a/newlib/libm/machine/spu/headers/recipd2.h +++ b/newlib/libm/machine/spu/headers/recipd2.h @@ -80,9 +80,7 @@ */ static __inline vector double _recipd2(vector double value_d) { - vector unsigned long long zero = (vector unsigned long long) { 0x0000000000000000ULL, 0x0000000000000000ULL }; vector unsigned long long expmask = (vector unsigned long long) { 0x7FF0000000000000ULL, 0x7FF0000000000000ULL }; - vector unsigned long long signmask = (vector unsigned long long) { 0x8000000000000000ULL, 0x8000000000000000ULL }; vector float x0; vector float value; vector float two = spu_splats(2.0f); @@ -94,6 +92,7 @@ static __inline vector double _recipd2(vector double value_d) * point exponents that are out of single precision range. */ bias = spu_xor(spu_and(value_d, (vector double)expmask), (vector double)expmask); + value = spu_roundtf(spu_mul(value_d, bias)); x0 = spu_re(value); x1 = spu_extend(spu_mul(x0, spu_nmsub(value, x0, two))); @@ -102,10 +101,22 @@ static __inline vector double _recipd2(vector double value_d) x3 = spu_mul(x2, spu_nmsub(value_d, x2, two_d)); /* Handle input = +/- infinity or +/-0. */ - vec_double2 xabs = spu_andc(value_d, (vec_double2)signmask); - vec_ullong2 zeroinf = spu_or(spu_cmpeq(xabs, (vec_double2)expmask), - spu_cmpeq(xabs, (vec_double2)zero)); - x3 = spu_sel(x3, spu_xor(value_d, (vector double)expmask), zeroinf); + +#ifdef __SPU_EDP__ + vec_ullong2 is0inf = spu_testsv(value_d, SPU_SV_NEG_ZERO | SPU_SV_POS_ZERO | + SPU_SV_NEG_INFINITY | SPU_SV_POS_INFINITY); +#else + vec_double2 nzero = spu_splats(-0.0); + vec_double2 xabs = spu_andc(value_d, nzero); + vector unsigned char swap = (vector unsigned char) {4,5,6,7, 0,1,2,3, 12,13,14,15, 8,9,10,11}; + vec_uint4 isinf = spu_cmpeq((vec_uint4)xabs, (vec_uint4)expmask); + vec_uint4 iszero = spu_cmpeq((vec_uint4)xabs, 0); + isinf = spu_and(isinf, spu_shuffle(isinf, isinf, swap)); + iszero = spu_and(iszero, spu_shuffle(iszero, iszero, swap)); + vec_ullong2 is0inf = (vec_ullong2)spu_or(isinf, iszero); +#endif /* __SPU_EDP__ */ + + x3 = spu_sel(x3, spu_xor(value_d, (vector double)expmask), is0inf); return (x3); } |