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Diffstat (limited to 'newlib/libm/machine/spu/headers/truncf4.h')
| -rw-r--r-- | newlib/libm/machine/spu/headers/truncf4.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/truncf4.h b/newlib/libm/machine/spu/headers/truncf4.h new file mode 100644 index 000000000..51c2ac5df --- /dev/null +++ b/newlib/libm/machine/spu/headers/truncf4.h @@ -0,0 +1,91 @@ +/* -------------------------------------------------------------- */ +/* (C)Copyright 2006,2007, */ +/* International Business Machines Corporation, */ +/* Sony Computer Entertainment, Incorporated, */ +/* Toshiba Corporation, */ +/* */ +/* 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 IBM Corporation nor the names of its */ +/* contributors may be used to endorse or promote products */ +/* derived from this software without specific prior written */ +/* permission. */ +/* 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 IBM Corporation 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. */ +/* -------------------------------------------------------------- */ +/* PROLOG END TAG zYx */ +#ifdef __SPU__ +#ifndef _TRUNCF4_H_ +#define _TRUNCF4_H_ 1 + +#include <spu_intrinsics.h> + +/* + * FUNCTION + * vector float _truncf4(vector float x) + * + * DESCRIPTION + * The _truncf4 function truncates the elements of the input vector + * downwards (towards zero) to the nearest integer. + * + */ +static __inline vector float _truncf4(vector float x) +{ + vec_int4 exp; + vec_uint4 or_mask, and_mask, mask; + vec_float4 out; + + // Construct a mask to remove the fraction bits. The mask + // depends on the exponent of the floating point + // input value. + exp = spu_sub(127, spu_and(spu_rlmask((vec_int4) x, -23), 0xFF)); + + // Be sure to always preserve the sign bit + or_mask = spu_rlmask(spu_cmpgt(exp, 0),-1); + + and_mask = spu_rlmask(spu_splats((unsigned int)0x7FFFFF), exp); + mask = spu_or(spu_and(and_mask, spu_cmpgt(exp, -31)), or_mask); + + // Apply the mask and return the result. + + out = spu_andc(x, (vec_float4) (mask)); + return (out); +} +#endif /* _TRUNCF4_H_ */ +#endif /* __SPU__ */ |