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Added SCE SIMD math library in Extras/simdmathlibrary

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The upcoming vectormath that will used to speed up the SPU version of Extras/BulletMultiThreaded depends on this.
This commit is contained in:
ejcoumans
2007-07-23 04:58:24 +00:00
parent 685138d033
commit 7529cdb3f6
287 changed files with 32064 additions and 0 deletions
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53
Extras/simdmathlibrary/ppu/sqrtf4.c Normal file
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/* sqrtf4 -
Copyright (C) 2006, 2007 Sony Computer Entertainment Inc.
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 the Sony Computer Entertainment Inc 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.
*/
#include <simdmath.h>
#include <altivec.h>
// sqrtf4 - for each of four float slots, compute square root.
// Undefined if input < 0.
vector float
sqrtf4 (vector float x)
{
// Reciprocal square root estimate and 1 Newton-Raphson iteration.
vector float zero = (vector float){0.0f, 0.0f, 0.0f, 0.0f};
vector float half = (vector float){0.5f, 0.5f, 0.5f, 0.5f};
vector float one = (vector float){1.0f, 1.0f, 1.0f, 1.0f};
vector float y0, y0x, y0xhalf;
vector unsigned int cmp_zero;
y0 = vec_rsqrte( x );
cmp_zero = (vector unsigned int)vec_cmpeq( x, zero );
y0x = vec_madd( y0, x, zero );
y0xhalf = vec_madd( y0x, half, zero );
return vec_sel( vec_madd( vec_nmsub( y0, y0x, one ), y0xhalf, y0x ), zero, cmp_zero );
}