105 lines
3.8 KiB
C
105 lines
3.8 KiB
C
/*
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(C) Copyright 2001,2006,
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International Business Machines Corporation,
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Sony Computer Entertainment, Incorporated,
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Toshiba Corporation,
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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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 names of the copyright holders nor the names of their
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _FESETROUND_H_
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#define _FESETROUND_H_ 1
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#include <spu_intrinsics.h>
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#include <fenv.h>
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#define FE_MASK_ROUND (__FE_ROUND_ELE_0 | __FE_ROUND_ELE_1)
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#define SMALL (FE_MASK_ROUND - 1)
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#define LARGE (FE_MASK_ROUND + \
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((__FE_SPU_DOWNWARD << 2) | __FE_SPU_DOWNWARD) + 1)
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static __inline int _fesetround(int mode)
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{
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unsigned int umode;
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vec_uint4 vec_mode;
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vec_uint4 valid, fail;
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vec_uint4 cur_fpscr, new_fpscr, mask_fpscr;
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vec_uint4 const valid_ele0 =
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{ FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD, FE_DOWNWARD };
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vec_uint4 const valid_ele1 =
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{ FE_TONEAREST_1, FE_TOWARDZERO_1, FE_UPWARD_1, FE_DOWNWARD_1 };
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vec_uint4 const too_large = { LARGE, LARGE, LARGE, LARGE };
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vec_uchar16 const splat_ele0 =
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{ 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3 };
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vec_uint4 const clear_non_ele0 = { 0xffffffff, 0, 0, 0 };
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/*
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* There are 24 valid values, check for a range plus the other 8
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* rather than check for specific bit settings.
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*
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* These are all the valid values:
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* 0xf00 through 0xf0f (SMALL + 1 through LARGE - 1, 16 values)
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* 0xc00 0xc04 0xc08 0xc0c (in ele0)
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* 0x300 0x301 0x302 0x303 (in ele1)
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*/
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umode = mode;
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vec_mode = spu_splats(umode);
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valid = spu_cmpeq(vec_mode, valid_ele0);
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valid = spu_or(valid, spu_cmpeq(vec_mode, valid_ele1));
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valid = spu_or(valid, spu_cmpgt(vec_mode, SMALL));
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valid = spu_and(valid, spu_cmpgt(too_large, vec_mode));
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fail = spu_gather(valid);
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fail = spu_cmpeq(fail, 0);
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/*
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* set all elements of fail to the value of fail's element 0, so
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* we can select the current fpscr values on failure.
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*/
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fail = spu_shuffle(fail, fail, splat_ele0);
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cur_fpscr = spu_mffpscr();
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/*
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* We don't have to mask the round element selection out since it
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* is shifted out.
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*/
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new_fpscr = spu_promote(umode << 8, 0);
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new_fpscr = spu_and(new_fpscr, clear_non_ele0);
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/*
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* Use the element bits of the mode to set the mask.
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*/
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mask_fpscr = spu_promote((umode & FE_MASK_ROUND), 0);
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new_fpscr = spu_sel(cur_fpscr, new_fpscr, mask_fpscr);
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/*
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* Use the current fpscr value if the round mode was invalid
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*/
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new_fpscr = spu_sel(new_fpscr, cur_fpscr, fail);
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spu_mtfpscr(new_fpscr);
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return spu_extract(fail, 0);
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}
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#endif /* _FESETROUND_H_ */
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