diff options
Diffstat (limited to 'newlib/libm/machine/spu/headers/ceilf.h')
-rw-r--r-- | newlib/libm/machine/spu/headers/ceilf.h | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/ceilf.h b/newlib/libm/machine/spu/headers/ceilf.h new file mode 100644 index 000000000..deb900f4e --- /dev/null +++ b/newlib/libm/machine/spu/headers/ceilf.h @@ -0,0 +1,123 @@ +/* + (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 _CEILF_H_ +#define _CEILF_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +/* + * FUNCTION + * float _ceilf(float value) + * + * DESCRIPTION + * The _ceilf routine round the input value "value" upwards to the + * nearest integer returning the result as a float. Two forms of the + * ceiling function are provided - full range and limited (integer) + * range. + * + * The full range form (default) provides ceiling computation on + * all IEEE floating point values. The ceiling of NANs remain NANs. + * The ceiling of denorms results in zero. + * + * The limited range form (selected by defining CEIL_INTEGER_RANGE) + * compute ths ceiling of all floating-point values in the 32-bit + * signed integer range. Values outside this range get clamped. + */ + +static __inline float _ceilf(float value) +{ +#ifdef CEIL_INTEGER_RANGE + /* 32-BIT INTEGER DYNAMIC RANGE + */ + union { + float f; + signed int i; + unsigned int ui; + } bias; + + bias.f = value; + + /* If positive, bias the input value to truncate towards + * positive infinity, instead of zero. + */ + bias.ui = ~(unsigned int)(bias.i >> 31) & 0x3F7FFFFF; + value += bias.f; + + /* Remove fraction bits by casting to an integer and back + * to a floating-point value. + */ + return ((float)((int)value)); + +#else /* !CEIL_INTEGER_RANGE */ + /* FULL FLOATING-POINT RANGE + */ + vec_int4 exp, shift; + vec_uint4 mask, frac_mask, addend, insert, pos; + vec_float4 in, out; + vec_float4 one = VEC_SPLAT_F32(1.0f); + + in = spu_promote(value, 0); + + /* This function generates the following component + * based upon the inputs. + * + * mask = bits of the input that need to be replaced. + * insert = value of the bits that need to be replaced + * addend = value to be added to perform function. + * + * These are applied as follows:. + * + * out = ((in & mask) | insert) + addend + */ + pos = spu_cmpgt((vec_int4)in, -1); + exp = spu_and(spu_rlmask((vec_int4)in, -23), 0xFF); + + shift = spu_sub(127, exp); + + frac_mask = spu_and(spu_rlmask(VEC_SPLAT_U32(0x7FFFFF), shift), + spu_cmpgt((vec_int4)shift, -31)); + + mask = spu_orc(frac_mask, spu_cmpgt(exp, 126)); + + addend = spu_andc(spu_and(spu_add(mask, 1), pos), spu_cmpeq(spu_and((vec_uint4)in, mask), 0)); + + insert = spu_andc(spu_and(pos, (vec_uint4)one), + spu_cmpgt((vec_uint4)spu_add(exp, -1), 126)); + + out = (vec_float4)spu_add(spu_sel((vec_uint4)in, insert, mask), addend); + + return (spu_extract(out, 0)); +#endif /* CEIL_INTEGER_RANGE */ +} +#endif /* _CEILF_H_ */ |