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Diffstat (limited to 'newlib/libm/machine/spu/headers/acosf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/acosf4.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/acosf4.h b/newlib/libm/machine/spu/headers/acosf4.h new file mode 100644 index 000000000..bb4dba658 --- /dev/null +++ b/newlib/libm/machine/spu/headers/acosf4.h @@ -0,0 +1,180 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* International Business Machines Corporation, */ +/* Sony Computer Entertainment, Incorporated, */ +/* Toshiba Corporation, */ +/* */ +/* All Rights Reserved. */ +/* */ +/* Redistribution and use in source and binary forms, with or */ +/* without modification, are permitted provided that the */ +/* following conditions are met: */ +/* */ +/* - Redistributions of source code must retain the above copyright*/ +/* notice, this list of conditions and the following disclaimer. */ +/* */ +/* - Redistributions in binary form must reproduce the above */ +/* copyright notice, this list of conditions and the following */ +/* disclaimer in the documentation and/or other materials */ +/* provided with the distribution. */ +/* */ +/* - Neither the name of IBM Corporation nor the names of its */ +/* contributors may be used to endorse or promote products */ +/* derived from this software without specific prior written */ +/* permission. */ +/* Redistributions of source code must retain the above copyright */ +/* notice, this list of conditions and the following disclaimer. */ +/* */ +/* Redistributions in binary form must reproduce the above */ +/* copyright notice, this list of conditions and the following */ +/* disclaimer in the documentation and/or other materials */ +/* provided with the distribution. */ +/* */ +/* Neither the name of IBM Corporation nor the names of its */ +/* contributors may be used to endorse or promote products */ +/* derived from this software without specific prior written */ +/* permission. */ +/* */ +/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */ +/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */ +/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ +/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */ +/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */ +/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */ +/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */ +/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */ +/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */ +/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */ +/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */ +/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ +/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ +/* -------------------------------------------------------------- */ +/* PROLOG END TAG zYx */ +#ifdef __SPU__ + +#ifndef _ACOSF4_H_ +#define _ACOSF4_H_ 1 + +#include <spu_intrinsics.h> + +#include "divf4.h" +#include "sqrtf4.h" + +/* + * FUNCTION + * vector float _acosf4(vector float x) + * + * DESCRIPTION + * The _acosf4 function computes the arc cosine for a vector of values x; + * that is the values whose cosine is x. Results are undefined if x is + * outside the range [-1, 1]. + * + * RETURNS + * The _acosf4 function returns the arc cosine in radians and the value is + * mathematically defined to be in the range [0, pi]. + * + */ +static __inline vector float _acosf4(vector float x) +{ + vec_float4 zero = spu_splats(0.0f); + vec_float4 half = spu_splats(0.5f); + vec_float4 one = spu_splats(1.0f); + vec_float4 two = spu_splats(2.0f); + vec_float4 pi = spu_splats(3.1415925026e+00f); + vec_float4 pio2_hi = spu_splats(1.5707962513e+00f); + vec_float4 pio2_lo = spu_splats(7.5497894159e-08f); + + vec_float4 snan = (vec_float4)spu_splats((unsigned int)0x7FC00000); + vec_uint4 denorm_threshold = spu_splats((unsigned int)0x23000000); + vec_uint4 sign_mask = spu_splats((unsigned int)0x80000000); + + + vec_float4 p0 = (vec_float4)spu_splats((unsigned int)0x3E2AAAAB); + vec_float4 p1 = (vec_float4)spu_splats((unsigned int)0xBEA6B090); + vec_float4 p2 = (vec_float4)spu_splats((unsigned int)0x3E4E0AA8); + vec_float4 p3 = (vec_float4)spu_splats((unsigned int)0xBD241146); + vec_float4 p4 = (vec_float4)spu_splats((unsigned int)0x3A4F7F04); + vec_float4 p5 = (vec_float4)spu_splats((unsigned int)0x3811EF08); + + vec_float4 q1 = (vec_float4)spu_splats((unsigned int)0xC019D139); + vec_float4 q2 = (vec_float4)spu_splats((unsigned int)0x4001572D); + vec_float4 q3 = (vec_float4)spu_splats((unsigned int)0xBF303361); + vec_float4 q4 = (vec_float4)spu_splats((unsigned int)0x3D9DC62E); + + + vec_uint4 x_abs = spu_andc((vec_uint4)x,sign_mask); + vec_uint4 x_pos = spu_cmpgt(sign_mask,(vec_uint4)x); + + + vec_uint4 almost_half = spu_splats((unsigned int)0x3EFFFFFF); + vec_uint4 sel0 = spu_nand(spu_splats((unsigned int)0xFFFFFFFF),spu_cmpgt(x_abs,almost_half)); + vec_uint4 sel1 = spu_andc(x_pos,sel0); // pos + + vec_float4 za = spu_sel(spu_sel(spu_add(one,x),spu_sub(one,x),sel1) ,x,sel0); + vec_float4 zb = spu_sel(half,x,sel0); + + vec_float4 z = spu_mul(za,zb); + + vec_float4 p; + p = spu_madd(z,p5,p4); + p = spu_madd(p,z,p3); + p = spu_madd(p,z,p2); + p = spu_madd(p,z,p1); + p = spu_madd(p,z,p0); + p = spu_mul(p,z); + + vec_float4 q; + q = spu_madd(z,q4,q3); + q = spu_madd(q,z,q2); + q = spu_madd(q,z,q1); + q = spu_madd(q,z,one); + + // Only used by secondaries + vec_float4 s = _sqrtf4(z); + + vec_float4 r = _divf4(p,q); + + vec_float4 w1 = spu_msub(r,s,pio2_lo); + + + vec_float4 df = (vec_float4)spu_and((vec_uint4)s,0xFFFFF000); + vec_float4 c = _divf4(spu_nmsub(df,df,z),spu_add(s,df)); + vec_float4 w2 = spu_madd(r,s,c); + + vec_float4 result0 = spu_sub(pio2_hi,spu_sub(x,spu_nmsub(x,r,pio2_lo))); + + + vec_float4 result1 = spu_mul(two,spu_add(df,w2)); + vec_float4 result2 = spu_nmsub(two,spu_add(s,w1),pi); + + + vec_float4 result; + + result = spu_sel(result2,result1,sel1); + result = spu_sel(result,result0,sel0); + + // If |x|==1 then: + // if x == 1, return 0 + // else return pi + + vec_uint4 abs_one = spu_cmpeq(x_abs,(vec_uint4)one); + vec_uint4 out_of_bounds = spu_cmpgt(x_abs,(vec_uint4)one); + vec_uint4 underflow = spu_cmpgt(denorm_threshold,x_abs); + + + + result = spu_sel(result,spu_sel(pi,zero,x_pos),abs_one); + + // If 1 < |x| then return sNaN + result = spu_sel(result,snan,out_of_bounds); + + // If |x| < 2**-57, then return pi/2 (OFF BY 1 ULP) + result = spu_sel(result,spu_add(pio2_hi,pio2_lo),underflow); + + return result; +} + +#endif /* _ACOSF4_H_ */ +#endif /* __SPU__ */ + + |