72 lines
3.0 KiB
C
72 lines
3.0 KiB
C
/* fmaxd2 - for each of two double slots, compute maximum of x and y
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Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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All rights reserved.
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Redistribution and use in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the Sony Computer Entertainment Inc nor the names
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of its contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ___SIMD_MATH_FMAXD2_H___
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#define ___SIMD_MATH_FMAXD2_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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/* Return the maximum numeric value of their arguments. If one argument
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* is a NaN, fmax returns the other value. If both are NaNs, then a NaN
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* is returned.
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*/
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static inline vector double
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_fmaxd2 (vector double x, vector double y)
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{
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vec_ullong2 selector, denorm;
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vec_double2 x_offset, y_offset, diff;
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vec_uint4 nan_x, abs_x, gt, eq;
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vec_uint4 sign = (vec_uint4){0x80000000, 0, 0x80000000, 0};
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vec_uint4 infinity = (vec_uint4){0x7FF00000, 0, 0x7FF00000, 0};
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vec_uint4 exp0 = (vec_uint4){0x3FF00000, 0, 0x3FF00000, 0};
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/* If both x and y are denorm or zero, then set 0x3ff to exponent
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*/
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denorm = (vec_ullong2)spu_cmpeq(spu_and((vec_uint4)spu_or(x, y), infinity), 0);
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x_offset = spu_sel(x, spu_or(x, (vec_double2)exp0), denorm);
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y_offset = spu_sel(y, spu_or(y, (vec_double2)exp0), denorm);
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/* If x is a NaN, then select y as max
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*/
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abs_x = spu_andc((vec_uint4)x, sign);
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gt = spu_cmpgt(abs_x, infinity);
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eq = spu_cmpeq(abs_x, infinity);
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nan_x = spu_or(gt, spu_and(eq, spu_rlqwbyte(gt, 4)));
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diff = spu_sub(x_offset, y_offset);
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selector = (vec_ullong2)spu_orc(nan_x, spu_cmpgt((vec_int4)diff, -1));
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selector = spu_shuffle(selector, selector, ((vec_uchar16){0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11}));
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return spu_sel(x, y, selector);
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}
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#endif
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