diff options
Diffstat (limited to 'newlib/libm/machine/spu/headers/remainderf.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/remainderf.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/remainderf.h b/newlib/libm/machine/spu/headers/remainderf.h new file mode 100644 index 000000000..b610b673e --- /dev/null +++ b/newlib/libm/machine/spu/headers/remainderf.h @@ -0,0 +1,141 @@ +/* + (C) Copyright 2001,2006, + 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 names of the copyright holders nor the names of their + 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. +*/ +#ifndef _REMAINDERF_H_ +#define _REMAINDERF_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +static __inline float _remainderf(float x, float y) +{ + int n; + vec_uint4 vx, vy, z; + vec_uint4 abs_x, abs_y, abs_2x, abs_2y; + vec_uint4 exp_x, exp_y; + vec_uint4 zero_x, zero_y; + vec_uint4 logb_x, logb_y; + vec_uint4 mant_x, mant_y; + vec_uint4 result, result0, resultx, cnt, sign, bias; + vec_uint4 sign_mask = VEC_SPLAT_U32(0x80000000); + vec_uint4 implied_1 = VEC_SPLAT_U32(0x00800000); + vec_uint4 mant_mask = VEC_SPLAT_U32(0x007FFFFF); + vec_float4 two = { 2.0f, 2.0f, 2.0f, 2.0f }; + + vx = (vec_uint4)spu_promote(x, 0); + vy = (vec_uint4)spu_promote(y, 0); + + abs_x = spu_andc(vx, sign_mask); + abs_y = spu_andc(vy, sign_mask); + + abs_2y = spu_add(abs_y, implied_1); /* abs_2y = 2 * abs_y */ + + sign = spu_and(vx, sign_mask); + + /* Compute abs_x = fmodf(abs_x, 2*abs_y). If y is greater than 0.5*SMAX + * (SMAX is the maximum representable float), then return abs_x. + */ + { + /* Determine ilogb of abs_x and abs_2y and + * extract the mantissas (mant_x, mant_y) + */ + exp_x = spu_rlmask(abs_x, -23); + exp_y = spu_rlmask(abs_2y, -23); + + resultx = spu_or(spu_cmpgt(abs_2y, abs_x), spu_cmpgt(abs_y, VEC_SPLAT_U32(0x7F7FFFFF))); + + zero_x = spu_cmpeq(exp_x, 0); + zero_y = spu_cmpeq(exp_y, 0); + + logb_x = spu_add(exp_x, -127); + logb_y = spu_add(exp_y, -127); + + mant_x = spu_andc(spu_sel(implied_1, abs_x, mant_mask), zero_x); + mant_y = spu_andc(spu_sel(implied_1, abs_2y, mant_mask), zero_y); + + /* Compute fixed point fmod of mant_x and mant_y. Set the flag, + * result0, to all ones if we detect that the final result is + * ever 0. + */ + result0 = spu_or(zero_x, zero_y); + + n = spu_extract(spu_sub(logb_x, logb_y), 0); + + + while (n-- > 0) { + z = spu_sub(mant_x, mant_y); + + result0 = spu_or(spu_cmpeq(z, 0), result0); + + mant_x = spu_sel(spu_add(mant_x, mant_x), spu_add(z, z), + spu_cmpgt((vec_int4)z, -1)); + } + + z = spu_sub(mant_x, mant_y); + mant_x = spu_sel(mant_x, z, spu_cmpgt((vec_int4)z, -1)); + + result0 = spu_or(spu_cmpeq(mant_x, 0), result0); + + /* Convert the result back to floating point and restore + * the sign. If we flagged the result to be zero (result0), + * zero it. If we flagged the result to equal its input x, + * (resultx) then return x. + */ + cnt = spu_add(spu_cntlz(mant_x), -8); + + mant_x = spu_rl(spu_andc(mant_x, implied_1), (vec_int4)cnt); + + exp_y = spu_sub(exp_y, cnt); + result0 = spu_orc(result0, spu_cmpgt((vec_int4)exp_y, 0)); /* zero denorm results */ + exp_y = spu_rl(exp_y, 23); + + result = spu_sel(exp_y, mant_x, mant_mask); + abs_x = spu_sel(spu_andc(result, spu_rlmask(result0, -1)), abs_x, resultx); + } + + /* if (2*x > y) + * x -= y + * if (2*x >= y) x -= y + */ + abs_2x = spu_add(abs_x, implied_1); + bias = spu_cmpgt(abs_2x, abs_y); + abs_x = spu_sel(abs_x, (vec_uint4)spu_sub((vec_float4)abs_x, (vec_float4)abs_y), bias); + bias = spu_andc(bias, spu_rlmaska((vec_uint4)spu_msub((vec_float4)abs_x, two, (vec_float4)abs_y), -31)); + abs_x = spu_sel(abs_x, (vec_uint4)spu_sub((vec_float4)abs_x, (vec_float4)abs_y), bias); + + /* Generate a correct final sign + */ + result = spu_xor(abs_x, sign); + + return (spu_extract((vec_float4)result, 0)); +} +#endif /* _REMAINDERF_H_ */ |