1 /* A vector double is returned that contains the remainder xi REM yi,
2 for the corresponding elements of vector double x and vector double y.
3 Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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31 #ifndef ___SIMD_MATH_REMAINDERD2_H___
32 #define ___SIMD_MATH_REMAINDERD2_H___
35 #include <spu_intrinsics.h>
37 #include <simdmath/_remainder.h>
38 #include <simdmath/fmodd2.h>
41 static inline vector double
42 _remainderd2(vector double x, vector double yy)
44 vec_uchar16 splat_hi = ((vec_uchar16){ 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11});
46 vec_uint4 abs_x, abs_yy, abs_2x, abs_2y;
48 vec_uint4 nan_out, overflow;
50 vec_uint4 half_smax = spu_splats((unsigned int)0x7FEFFFFF);
51 vec_uint4 sign_mask = (vec_uint4)(spu_splats(0x8000000000000000ULL));
52 vec_uint4 exp_mask = (vec_uint4)(spu_splats(0x7FF0000000000000ULL));
53 vec_uint4 val_nan = (vec_uint4)(spu_splats(0x7FF8000000000000ULL));
54 vec_uint4 vec_zero = spu_splats((unsigned int)0);
58 abs_x = spu_andc((vec_uint4)x, sign_mask);
59 abs_yy = spu_andc((vec_uint4)yy, sign_mask);
60 y_hi = spu_shuffle(abs_yy, abs_yy, splat_hi);
64 is_zeroy = spu_cmpeq(abs_yy, vec_zero);
65 is_zeroy = spu_and(is_zeroy, spu_rlqwbyte(is_zeroy, 4));
66 nan_out = __vec_gt64_half(abs_yy, exp_mask); // y > 7FF00000
67 nan_out = spu_or(nan_out, spu_cmpgt(abs_x, half_smax)); // x >= 7FF0000000000000
68 nan_out = spu_or(nan_out, is_zeroy); // y = 0
69 nan_out = spu_shuffle(nan_out, nan_out, splat_hi);
73 abs_2y = __rem_twice_d(abs_yy); // 2 x y
75 result = (vec_uint4)_fmodd2((vec_double2)abs_x, (vec_double2)abs_2y);
77 // abs_x = spu_sel(spu_andc(result, sign_mask), abs_x, spu_cmpgt(y_hi, spu_splats((unsigned int)0x7FBFFFFF)));
78 abs_x = spu_sel(result, abs_x, spu_cmpgt(y_hi, spu_splats((unsigned int)0x7FEFFFFF)));
82 * if (2*x >= y) x -= y
84 overflow = spu_cmpgt(y_hi, spu_splats((unsigned int)0x7FEFFFFF));
86 abs_2x = __rem_twice_d(abs_x); // 2 x x
88 bias = __vec_gt64(abs_2x, abs_yy); // abs_2x > abs_yy
89 bias = spu_andc(bias, overflow);
91 abs_x = spu_sel(abs_x, __rem_sub_d(abs_x, abs_yy), bias);
94 overflow = spu_or(overflow, spu_shuffle(spu_rlmaska(abs_x, -31), vec_zero, splat_hi)); // minous
97 abs_2x = __rem_twice_d(spu_andc(abs_x, sign_mask)); // 2 x x unsupport minous
98 bias = spu_andc(bias, spu_rlmaska(__rem_sub_d(abs_2x, abs_yy), -31));
99 bias = spu_andc(spu_shuffle(bias, bias, splat_hi), overflow);
100 abs_x = spu_sel(abs_x, __rem_sub_d(abs_x, abs_yy), bias);
102 /* select final answer
104 result = spu_xor(abs_x, spu_and((vec_uint4)x, sign_mask)); // set sign
105 result = spu_sel(result, val_nan, nan_out); // if nan
107 return ((vec_double2)result);