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Diffstat (limited to 'newlib/libm/machine/spu/headers/llroundf.h')
-rw-r--r-- | newlib/libm/machine/spu/headers/llroundf.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/newlib/libm/machine/spu/headers/llroundf.h b/newlib/libm/machine/spu/headers/llroundf.h new file mode 100644 index 000000000..cfdebba2a --- /dev/null +++ b/newlib/libm/machine/spu/headers/llroundf.h @@ -0,0 +1,87 @@ +/* + (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 _LLROUNDF_H_ +#define _LLROUNDF_H_ 1 + +#include <spu_intrinsics.h> +#include "headers/vec_literal.h" + +static __inline long long int _llroundf(float x) +{ + int shift; + vec_int4 exp; + vec_uint4 mant, sign, borrow; + vec_float4 in; + + in = spu_promote(x, 0); + + /* Place mantissa bits (including implied most signficant + * bit) into the most significant bits of element 3. Elements + * 0, 1, and 2 are zeroed. + */ + mant = spu_sel(spu_rlmaskqwbyte((vec_uint4)in, -11), + VEC_SPLAT_U32(0x80000000), + VEC_LITERAL(vec_uint4, 0,0,0xFF,0x800000FF)); + + /* Determine how many bits to shift the mantissa to correctly + * align it into long long element 0. + */ + exp = spu_and(spu_rlmask((vec_int4)in, -23), 0xFF); + shift = spu_extract(spu_add(exp, -94), 0); + + /* Algn mantissa bits + */ + mant = spu_slqwbytebc(spu_slqw(mant, shift), shift); + + /* Perform round by adding 1 if the fraction bits are + * greater than or equal to .5 + */ + mant = spu_add(mant, spu_and(spu_rlqw(mant, 1), VEC_LITERAL(vec_uint4, 0,1,0,0))); + + /* Compute the two's complement of the mantissa if the + * input is negative. + */ + sign = spu_maskw(spu_extract(spu_rlmaska((vec_int4)in, -31), 0)); + + mant = spu_xor(mant, sign); + borrow = spu_genb(mant, sign); + + borrow = spu_shuffle(borrow, borrow, + VEC_LITERAL(vec_uchar16, 4,5,6,7, 192,192,192,192, + 4,5,6,7, 192,192,192,192)); + mant = spu_subx(mant, sign, borrow); + + return (spu_extract((vec_llong2)(mant), 0)); +} + +#endif /* _LLROUNDF_H_ */ |