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Diffstat (limited to 'newlib/libm/machine/spu/headers/atan2f4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/atan2f4.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/atan2f4.h b/newlib/libm/machine/spu/headers/atan2f4.h new file mode 100644 index 000000000..58293fbeb --- /dev/null +++ b/newlib/libm/machine/spu/headers/atan2f4.h @@ -0,0 +1,106 @@ +/* -------------------------------------------------------------- */ +/* (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 _ATAN2F4_H_ +#define _ATAN2F4_H_ 1 + +#include <spu_intrinsics.h> + +#include "divf4.h" +#include "atanf4.h" + +/* + * FUNCTION + * vector float _atan2f4(vector float y, vector float x) + * + * DESCRIPTION + * The atan2f4 function returns a vector containing the angles + * whose tangets are y/x for the corresponding elements of the + * input vectors. + * + * The reason this function exists is to use the signs of the + * arguments to determine the quadrant of the result. Consider + * sin(x)/cos(x) on the domain (-pi, pi]. Four quadrants are + * defined by the signs of sin and cos on this domain. + * + * Special Cases: + * - If the corresponding elements of x and y are zero, the + * resulting element is undefined. + * + */ + +static __inline vector float _atan2f4(vector float y, vector float x) +{ + vector float pi = spu_splats((float)SM_PI); + vector float zero = spu_splats(0.0f); + vector unsigned int quad1; + vector unsigned int quad4; + vector float result; + + vector unsigned int xlt0; + vector unsigned int yge0; + vector unsigned int ylt0; + + xlt0 = (vec_uint4)spu_rlmaska((vec_int4)x, 31); + ylt0 = (vec_uint4)spu_rlmaska((vec_int4)y, 31); + yge0 = spu_cmpeq(ylt0, (vec_uint4)zero); + + quad1 = spu_and(ylt0, xlt0); + quad4 = spu_and(yge0, xlt0); + + result = _atanf4(_divf4(y,x)); + result = spu_sel(result, spu_sub(result, pi), quad1); + result = spu_sel(result, spu_add(result, pi), quad4); + + return result; +} + +#endif /* _ATAN2F4_H_ */ +#endif /* __SPU__ */ |