84 lines
3.0 KiB
C
84 lines
3.0 KiB
C
|
/*
|
||
|
* 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)
|