77 lines
2.5 KiB
C
77 lines
2.5 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/sf_rint.c in Newlib. */
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#include "amdgcnmach.h"
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static const float TWO23[2] = {
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8.3886080000e+06, /* 0x4b000000 */
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-8.3886080000e+06, /* 0xcb000000 */
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};
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DEF_VS_MATH_FUNC (v64sf, rintf, v64sf x)
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{
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FUNCTION_INIT (v64sf);
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v64si i0;
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GET_FLOAT_WORD (i0, x, NO_COND);
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v64si sx = (i0 >> 31) & 1;
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v64sf two23 = VECTOR_MERGE (TWO23[1] + x, TWO23[0] + x, sx != 0);
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v64si ix = (i0 & 0x7fffffff);
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v64si j0 = (ix >> 23) - 0x7f;
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VECTOR_IF (j0 < 23, cond)
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VECTOR_RETURN (x, cond & FLT_UWORD_IS_ZERO (ix));
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VECTOR_IF2 (j0 < 0, cond2, cond)
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v64si i1 = (i0 & 0x07fffff);
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VECTOR_COND_MOVE (i0, i0 & 0xfff00000, cond2);
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VECTOR_COND_MOVE (i0, i0 | (((i1 | -i1) >> 9) & 0x400000), cond2);
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SET_FLOAT_WORD (x, i0, cond2);
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v64sf w = two23 + x;
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v64sf t = w - two23;
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GET_FLOAT_WORD (i0, t, cond2);
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SET_FLOAT_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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v64si i = (0x007fffff) >> j0;
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VECTOR_RETURN (x, cond2 & ((i0 & i) == 0)); /* x is integral */
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i >>= 1;
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VECTOR_COND_MOVE (i0, (i0 & (~i)) | (0x200000 >> j0),
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cond2 & ((i0 & i) != 0));
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VECTOR_ENDIF
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VECTOR_ELSE (cond)
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VECTOR_RETURN (x + x, cond & ~FLT_UWORD_IS_FINITE (ix)); /* inf or NaN */
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VECTOR_RETURN (x, cond); /* x is integral */
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VECTOR_ENDIF
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SET_FLOAT_WORD (x, i0, NO_COND);
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v64sf w = two23 + x;
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VECTOR_RETURN (w - two23, NO_COND);
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FUNCTION_RETURN;
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}
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DEF_VARIANTS (rintf, sf, sf)
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