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Diffstat (limited to 'newlib/libm/machine/spu/headers/signbitd2.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/signbitd2.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/signbitd2.h b/newlib/libm/machine/spu/headers/signbitd2.h new file mode 100644 index 000000000..e1c955a05 --- /dev/null +++ b/newlib/libm/machine/spu/headers/signbitd2.h @@ -0,0 +1,86 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* 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. */ +/* 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 _SIGNBITD2_H_ +#define _SIGNBITD2_H_ 1 + +#include <spu_intrinsics.h> + +/* + * FUNCTION + * vector unsigned long long _signbitd2(vector double x) + * + * DESCRIPTION + * The signbitd2 function returns a vector which contains either all ones + * or all zeros, depending on the sign of the corresponding input vector + * element. + * + * Note that the signbit functions are not logically equivalent to + * x < 0.0. IEEE 754 floating point rules include a signed zero, so if + * the input value is –0.0, signbit will return non-zero, but the naive + * implementation will not. + * + * RETURNS + * The function signbitf4 returns an unsigned int vector in which each + * element is defined as: + * + * - ULLONG_MAX (0xFFFFFFFFFFFFFFFF) if the sign bit is set for the + * corresponding element of x + * - 0 (0x0000000000000000) otherwise. + * + */ +static __inline vector unsigned long long _signbitd2(vector double x) +{ + vec_uchar16 shuf = ((vec_uchar16){0, 1, 2, 3, 0, 1, 2, 3, 8, 9, 10, 11, 8, 9, 10, 11}); + vec_uint4 r = spu_rlmaska((vec_uint4)x,-31); + return (vec_ullong2)spu_shuffle(r,r,shuf); +} +#endif /* _SIGNBITD2_H_ */ +#endif /* __SPU__ */ |