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Diffstat (limited to 'newlib/libm/machine/spu/headers/erfcf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/erfcf4.h | 121 |
1 files changed, 0 insertions, 121 deletions
diff --git a/newlib/libm/machine/spu/headers/erfcf4.h b/newlib/libm/machine/spu/headers/erfcf4.h deleted file mode 100644 index cb621f3ae..000000000 --- a/newlib/libm/machine/spu/headers/erfcf4.h +++ /dev/null @@ -1,121 +0,0 @@ -/* -------------------------------------------------------------- */ -/* (C)Copyright 2007,2008, */ -/* International Business Machines 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. */ -/* */ -/* 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 _ERFCF4_H_ -#define _ERFCF4_H_ 1 - -#include <spu_intrinsics.h> - -#include "expf4.h" -#include "recipf4.h" -#include "divf4.h" -#include "erf_utils.h" - -/* - * FUNCTION - * vector float _erfcf4(vector float x) - * - * DESCRIPTION - * The erfcf4 function computes the complement error function of each element of x. - * - * C99 Special Cases: - * - erfc(+0) returns +1 - * - erfc(-0) returns +1 - * - erfc(+infinite) returns +0 - * - erfc(-infinite) returns +2 - * - */ - -static __inline vector float _erfcf4(vector float x) -{ - vec_float4 onehalff = spu_splats(0.5f); - vec_float4 zerof = spu_splats(0.0f); - vec_float4 onef = spu_splats(1.0f); - vec_float4 twof = spu_splats(2.0f); - vec_float4 sign_mask = spu_splats(-0.0f); - - /* This is where we switch from near zero approx. */ - vec_float4 approx_point = spu_splats(0.89f); - - vec_float4 xabs, xsqu, xsign; - vec_uint4 isneg; - vec_float4 tresult, presult, result; - - xsign = spu_and(x, sign_mask); - - /* Force Denorms to 0 */ - x = spu_add(x, zerof); - - xabs = spu_andc(x, sign_mask); - xsqu = spu_mul(x, x); - - /* - * Use Taylor Series for x near 0 - * Preserve sign of x in result, since erf(-x) = -erf(x) - * This approximation is for erf, so adjust for erfc. - */ - TAYLOR_ERFF4(xabs, xsqu, tresult); - tresult = spu_or(tresult, xsign); - tresult = spu_sub(onef, tresult); - - /* - * Now, use the Continued Fractions approximation away - * from 0. If x < 0, use erfc(-x) = 2 - erfc(x) - */ - CONTFRAC_ERFCF4(xabs, xsqu, presult); - isneg = spu_rlmaska((vec_uint4)x, -32); - presult = spu_sel(presult, spu_sub(twof, presult), isneg); - - /* - * Select the appropriate approximation. - */ - result = spu_sel(tresult, presult, spu_cmpgt(xabs, approx_point)); - - /* - * Special cases/errors. - */ - - /* x = +/- infinite */ - result = spu_sel(result, zerof, spu_cmpeq((vec_uint4)xabs, 0x7F800000)); - result = spu_sel(result, twof, spu_cmpeq((vec_uint4)xabs, 0xFF800000)); - - return result; -} - -#endif /* _ERFCF4_H_ */ -#endif /* __SPU__ */ |