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