93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
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/*
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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_scalbn.c in Newlib. */
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#include "amdgcnmach.h"
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#include <limits.h>
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#include <float.h>
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#if INT_MAX > 50000
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#define OVERFLOW_INT 50000
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#else
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#define OVERFLOW_INT 30000
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#endif
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static const float
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two25 = 3.355443200e+07, /* 0x4c000000 */
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twom25 = 2.9802322388e-08, /* 0x33000000 */
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huge = 1.0e+30,
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tiny = 1.0e-30;
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v64sf v64sf_copysignf_aux (v64sf, v64sf, v64si);
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DEF_VS_MATH_FUNC (v64sf, scalbnf, v64sf x, v64si n)
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{
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FUNCTION_INIT (v64sf);
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const v64sf huge_v = VECTOR_INIT ((float) huge);
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const v64sf tiny_v = VECTOR_INIT ((float) tiny);
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v64si ix;
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GET_FLOAT_WORD (ix, x, NO_COND);
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v64si hx = ix & 0x7fffffff;
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v64si k = hx >> 23; /* extract exponent */
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VECTOR_IF (FLT_UWORD_IS_ZERO(hx), cond)
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VECTOR_RETURN (x, cond);
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VECTOR_ENDIF
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VECTOR_IF (~FLT_UWORD_IS_FINITE(hx), cond) /* NaN or Inf */
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VECTOR_RETURN (x + x, cond);
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VECTOR_ENDIF
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VECTOR_IF (FLT_UWORD_IS_SUBNORMAL (hx), cond);
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VECTOR_COND_MOVE (x, x * two25, cond);
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GET_FLOAT_WORD (ix, x, cond);
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VECTOR_COND_MOVE (k, ((ix & 0x7f800000) >> 23) - 25, cond);
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VECTOR_IF2 (n < -50000, cond2, cond) /*underflow*/
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VECTOR_RETURN (tiny * x, cond2);
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VECTOR_ENDIF
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VECTOR_ENDIF
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VECTOR_IF (n > OVERFLOW_INT, cond) // in case integer overflow in n+k
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VECTOR_RETURN (huge_v * v64sf_copysignf_aux (huge_v, x, __mask), cond);
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VECTOR_ENDIF
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k = k + n;
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VECTOR_IF (k > FLT_LARGEST_EXP, cond) /* overflow */
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VECTOR_RETURN (huge_v * v64sf_copysignf_aux (huge_v, x, __mask), cond);
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VECTOR_ENDIF
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VECTOR_IF (k > 0, cond) /* normal result */
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SET_FLOAT_WORD (x, (ix & 0x807fffff) | (k << 23), cond);
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VECTOR_RETURN (x, cond);
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VECTOR_ENDIF
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VECTOR_IF (k < FLT_SMALLEST_EXP, cond) /*underflow*/
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VECTOR_RETURN (tiny_v * v64sf_copysignf_aux (tiny_v, x, __mask),
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k < FLT_SMALLEST_EXP);
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VECTOR_ENDIF
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k += 25; /* subnormal result */
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SET_FLOAT_WORD (x, (ix & 0x807fffff) | (k << 23), NO_COND);
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VECTOR_RETURN (x * twom25, NO_COND);
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FUNCTION_RETURN;
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}
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