1 /* rintd2 - Round the input to the nearest integer according to
2 the current rounding mode.
3 Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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31 #ifndef ___SIMD_MATH_RINTD2_H___
32 #define ___SIMD_MATH_RINTD2_H___
35 #include <spu_intrinsics.h>
37 static inline vector double
38 _rintd2(vector double in)
40 vec_ullong2 sign = ((vec_ullong2){0x8000000000000000ULL,0x8000000000000000ULL});
41 vec_uint4 vec_norm = ((vec_uint4){0x00100000,0,0x00100000,0});
42 vec_uint4 vec_bias = ((vec_uint4){0x43300000,0,0x43300000,0});
43 vec_double2 addend, xx;
49 abs_x = spu_andc((vec_uint4)in, (vec_uint4)sign);
52 is_zerox = spu_cmpeq( abs_x, 0);
53 is_denorm = spu_cmpgt( vec_norm, abs_x );
54 is_zerox = spu_and( is_zerox, spu_shuffle(is_zerox,is_zerox, ((vec_uchar16){4,5,6,7,0,1,2,3,12,13,14,15,8,9,10,11})));
55 is_denorm = spu_andc(is_denorm, is_zerox);
56 ofs = spu_and( vec_norm, is_denorm);
58 xx = spu_or( in, (vec_double2)ofs );
60 /* Add 2^53 and then subtract 2^53 to affect a round to be performed by the
61 * hardware. Also preserve the input sign so that negative inputs that
62 * round to zero generate a -0.0.
64 addend = (vec_double2)spu_and(vec_bias, spu_cmpgt( vec_bias, abs_x ));
65 addend = spu_sel(addend, in, sign);
67 return spu_sel(spu_sub(spu_add(xx, addend), addend), in, sign);