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Diffstat (limited to 'newlib/libm/machine/spu/headers/truncd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/truncd2.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/truncd2.h b/newlib/libm/machine/spu/headers/truncd2.h new file mode 100644 index 000000000..9dab7f24c --- /dev/null +++ b/newlib/libm/machine/spu/headers/truncd2.h @@ -0,0 +1,98 @@ +/* -------------------------------------------------------------- */ +/* (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 _TRUNCD2_H_ +#define _TRUNCD2_H_ 1 + +#include <spu_intrinsics.h> + +/* + * FUNCTION + * vector double _truncd2(vector double x) + * + * DESCRIPTION + * The _truncd2 function truncates the elements of the input vector + * downwards (towards zero) to the nearest integer. + * + */ +static __inline vector double _truncd2(vector double in) +{ + vec_uchar16 splat_hi = (vec_uchar16) { 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11 }; + vec_int4 exp, shift; + vec_uint4 sign = (vec_uint4) { 0x80000000, 0, 0x80000000, 0 }; + vec_uint4 or_mask, and_mask, mask; + vec_double2 in_hi, out; + + /* Construct a mask to remove the fraction bits. The mask + * depends on the exponent of the floating point + * input value. + */ + in_hi = spu_shuffle(in, in, splat_hi); + exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF); + + shift = spu_sub(((vec_int4) { 1023, 1043, 1023, 1043 }), exp); + or_mask = spu_andc(spu_cmpgt(shift, 0), sign); + + and_mask = spu_rlmask(((vec_uint4) { 0xFFFFF, -1, 0xFFFFF, -1 }), shift); + mask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask); + + /* Apply the mask and return the result. + */ + out = spu_andc(in, (vec_double2)(mask)); + + return (out); +} + + +#endif /* _TRUNCD2_H_ */ +#endif /* __SPU__ */ |