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Diffstat (limited to 'newlib/libm/machine/spu/headers/nearbyint.h')
-rw-r--r-- | newlib/libm/machine/spu/headers/nearbyint.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/nearbyint.h b/newlib/libm/machine/spu/headers/nearbyint.h new file mode 100644 index 000000000..beef45932 --- /dev/null +++ b/newlib/libm/machine/spu/headers/nearbyint.h @@ -0,0 +1,64 @@ +/* + (C) Copyright 2001,2006, + 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 names of the copyright holders nor the names of their + 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. +*/ +#ifndef _NEARBYINT_H_ +#define _NEARBYINT_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +/* Round the input to the nearest integer according to the current + * rounding mode without raising an inexact exception. + */ +static __inline double _nearbyint(double x) +{ + vec_uint4 fpscr; + vec_ullong2 sign = VEC_SPLAT_U64(0x8000000000000000ULL); + vec_double2 in, out, addend; + + fpscr = spu_mffpscr(); + + in = spu_promote(x, 0); + + /* Add 2^53 and then subtract 2^53 to affect a round to be performed by the + * hardware. Also preserve the input sign so that negative inputs that + * round to zero generate a -0.0. + */ + addend = spu_sel((vec_double2)(VEC_SPLAT_U64(0x4330000000000000ULL)), + in, sign); + out = spu_sel(spu_sub(spu_add(in, addend), addend), in, sign); + + spu_mtfpscr(fpscr); + + return (spu_extract(out, 0)); +} +#endif /* _NEARBYINT_H_ */ |