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Diffstat (limited to 'newlib/libm/machine/spu/headers/hypotf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/hypotf4.h | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/newlib/libm/machine/spu/headers/hypotf4.h b/newlib/libm/machine/spu/headers/hypotf4.h deleted file mode 100644 index bc46b8ba0..000000000 --- a/newlib/libm/machine/spu/headers/hypotf4.h +++ /dev/null @@ -1,127 +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 _HYPOTF4_H_ -#define _HYPOTF4_H_ 1 - -#include <spu_intrinsics.h> - -#include "sqrtf4.h" - -/* - * FUNCTION - * vector float _hypotf4(vector float x, vector float y) - * - * DESCRIPTION - * The function hypotf4 returns a float vector in which each element is - * the square root of the sum of the squares of the corresponding - * elements of x and y. In other words, each element is sqrt(x^2 + y^2). - * - * The purpose of this function is to avoid overflow during - * intermediate calculations, and therefore it is slower than - * simply calcualting sqrt(x^2 + y^2). - * - * This function is performed by factoring out the larger of the 2 - * input exponents and moving this factor outside of the sqrt calculation. - * This will minimize the possibility of over/underflow when the square - * of the values are calculated. Think of it as normalizing the larger - * input to the range [1,2). - * - * - * Special Cases: - * - hypot(x, +/-0) returns |x| - * - hypot(+/- infinity, y) returns +infinity - * - hypot(+/- infinity, NaN) returns +infinity - * - */ - - -static __inline vector float _hypotf4(vector float x, vector float y) -{ - vector unsigned int emask = spu_splats(0x7F800000u); - vector unsigned int mmask = spu_splats(0x007FFFFFu); - vector signed int bias = spu_splats(0x3F800000); - vector float inf = (vec_float4)spu_splats(0x7F800000); - vector float onef = spu_splats(1.0f); - vector float sbit = spu_splats(-0.0f); - vector float max, max_e, max_m; - vector float min, min_e, min_m; - vector unsigned int xgty; - vector float sum; - vector float result; - - /* Only need absolute values for this function */ - x = spu_andc(x, sbit); - y = spu_andc(y, sbit); - xgty = spu_cmpgt(x,y); - - max = spu_sel(y,x,xgty); - min = spu_sel(x,y,xgty); - - /* Extract exponents and mantissas */ - max_e = (vec_float4)spu_and((vec_uint4)max, emask); - max_m = (vec_float4)spu_and((vec_uint4)max, mmask); - min_e = (vec_float4)spu_and((vec_uint4)min, emask); - min_m = (vec_float4)spu_and((vec_uint4)min, mmask); - - /* Adjust the exponent of the smaller of the 2 input values by - * subtracting max_exp from min_exp. - */ - vec_int4 min_e_int = spu_sub((vec_int4)min_e, (vec_int4)max_e); - min_e = (vec_float4)spu_add(min_e_int, bias); - - /* If the new min exponent is too small, just set it to 0. It - * wouldn't contribute to the final result in either case. - */ - min_e = spu_sel(min_e, sbit, spu_cmpgt(sbit, min_e)); - - /* Combine new exponents with original mantissas */ - max = spu_or(onef, max_m); - min = spu_or(min_e, min_m); - - sum = _sqrtf4(spu_madd(max, max, spu_mul(min, min))); - sum = spu_mul(max_e, sum); - - /* Special case: x = +/- infinity */ - result = spu_sel(sum, inf, spu_cmpeq(x, inf)); - - return result; -} - -#endif /* _HYPOTF4_H_ */ -#endif /* __SPU__ */ |