derek.holloway
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32 lines
818 B
Common Lisp
32 lines
818 B
Common Lisp
/*===--------------------------------------------------------------------------
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* ROCm Device Libraries
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*
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* This file is distributed under the University of Illinois Open Source
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* License. See LICENSE.TXT for details.
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*===------------------------------------------------------------------------*/
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#include "mathD.h"
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#define DOUBLE_SPECIALIZATION
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#include "ep.h"
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extern CONSTATTR double MATH_PRIVATE(lnep)(double2 a, int ea);
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CONSTATTR double
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MATH_MANGLE(acosh)(double x)
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{
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bool b = x >= 0x1.0p+512;
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double s = b ? 0x1.0p-512 : 1.0;
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double sx = x * s;
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double2 a = add(sx, root2(sub(sqr(sx), s*s)));
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double z = MATH_PRIVATE(lnep)(a, b ? 512 : 0);
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if (!FINITE_ONLY_OPT()) {
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z = x == PINF_F64 ? x : z;
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z = x < 1.0 ? QNAN_F64 : z;
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}
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return z;
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}
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