67 lines
2.7 KiB
C
67 lines
2.7 KiB
C
/* truncd2 - Round the input to the nearest integer.
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Always rounds towards 0.
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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_TRUNCD2_H___
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#define ___SIMD_MATH_TRUNCD2_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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static inline vector double
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_truncd2(vector double in)
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{
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vec_uchar16 splat_hi = ((vec_uchar16){ 0,1,2,3,0,1,2,3, 8,9,10,11, 8,9,10,11});
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vec_int4 exp, shift;
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vec_uint4 sign = ((vec_uint4){ 0x80000000, 0, 0x80000000, 0});
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vec_uint4 or_mask, and_mask, mask;
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vec_double2 in_hi, out;
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/* Construct a mask to remove the fraction bits. The mask
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* depends on the exponent of the floating point
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* input value.
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*/
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in_hi = spu_shuffle(in, in, splat_hi);
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exp = spu_and(spu_rlmask((vec_int4)in_hi, -20), 0x7FF);
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shift = spu_sub(((vec_int4){ 1023, 1043, 1023, 1043}), exp);
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or_mask = spu_andc(spu_cmpgt(shift, 0), sign);
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and_mask = spu_rlmask(((vec_uint4){ 0xFFFFF, -1, 0xFFFFF, -1}), shift);
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mask = spu_or(spu_and(and_mask, spu_cmpgt(shift, -32)), or_mask);
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/* Apply the mask and return the result.
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*/
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out = spu_andc(in, (vec_double2)(mask));
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return (out);
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}
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#endif
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