newlib-cygwin/newlib/libm/machine/amdgcn/v64df_rint.c

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/*
* Copyright 2023 Siemens
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
/* Based on newlib/libm/common/s_rint.c in Newlib. */
#include "amdgcnmach.h"
static const double TWO52[2] = {
4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
-4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
};
DEF_VD_MATH_FUNC (v64df, rint, v64df x)
{
FUNCTION_INIT (v64df);
v64si i0, i1;
EXTRACT_WORDS (i0, i1, x);
v64si sx = (i0 >> 31) & 1;
v64df two52 = VECTOR_MERGE (VECTOR_INIT (TWO52[1]), VECTOR_INIT (TWO52[0]), sx != 0);
v64si j0 = ((i0 >> 20) & 0x7ff) - 0x3ff;
v64si i;
VECTOR_IF (j0 < 20, cond)
VECTOR_IF2 (j0 < 0, cond2, cond)
VECTOR_RETURN (x, cond2 & (((i0 & 0x7fffffff) | i1) == 0));
VECTOR_COND_MOVE (i1, i1 | (i0 & 0x0fffff), cond2);
VECTOR_COND_MOVE (i0, i0 & 0xfffe0000, cond2);
VECTOR_COND_MOVE (i0, i0 | (((i1 | -i1) >> 12) & 0x80000), cond2);
SET_HIGH_WORD (x, i0, cond2);
v64df w = two52 + x;
v64df t = w - two52;
GET_HIGH_WORD (i0, t, cond2);
SET_HIGH_WORD (t, (i0&0x7fffffff)|(sx<<31), cond2);
VECTOR_RETURN (t, cond2);
VECTOR_ELSE2 (cond2, cond)
i = (0x000fffff) >> j0;
VECTOR_RETURN (x, cond2 & (((i0 & i) | i1) == 0)); /* x is integral */
i >>= 1;
VECTOR_IF2 (((i0 & i) | i1) != 0, cond3, cond2)
VECTOR_COND_MOVE (i1, CAST_VECTOR(v64si, VECTOR_INIT (0x80000000)), cond3 & (j0 == 19));
VECTOR_COND_MOVE (i1, VECTOR_INIT (0), cond3 & (j0 != 19));
VECTOR_COND_MOVE (i0, (i0 & (~i)) | ((0x40000) >> j0), cond3);
VECTOR_ENDIF
VECTOR_ENDIF
VECTOR_ELSEIF (j0 > 51, cond)
VECTOR_RETURN (x + x, cond & (j0 == 0x400));
VECTOR_RETURN (x, cond);
VECTOR_ELSE (cond)
i = CAST_VECTOR (v64si, VECTOR_INIT (0xffffffff) >> (j0 - 20));
VECTOR_RETURN (x, cond & ((i1 & i) == 0));
i >>= 1;
VECTOR_COND_MOVE (i1, (i1 & (~i)) | (0x40000000 >> (j0 - 20)), cond & ((i1 & i) != 0));
VECTOR_ENDIF
INSERT_WORDS (x, i0, i1, NO_COND);
v64df w = two52 + x;
VECTOR_RETURN (w - two52, NO_COND);
FUNCTION_RETURN;
}
DEF_VARIANTS (rint, df, df)