56 lines
2.4 KiB
C
56 lines
2.4 KiB
C
/* nearbyintf4 - for each of four float slots, round to the nearest integer,
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consistent with the current rounding model,
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without raising an inexact floating-point exception.
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On SPU, the rounding mode for float is always towards zero.
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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_NEARBYINTF4_H___
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#define ___SIMD_MATH_NEARBYINTF4_H___
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#include <simdmath.h>
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#include <spu_intrinsics.h>
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static inline vector float
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_nearbyintf4(vector float x)
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{
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vector signed int xi;
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vector unsigned int inrange;
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// Can convert to and from signed integer to truncate values in range [-2^31, 2^31).
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// However, no truncation needed if exponent > 22.
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inrange = spu_cmpabsgt( (vector float)spu_splats(0x4b000000), x );
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xi = spu_convts( x, 0 );
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return spu_sel( x, spu_convtf( xi, 0 ), inrange );
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}
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#endif
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