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/*
* ====================================================
* 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_ilogb.c in Newlib. */
#include "amdgcnmach.h"
DEF_VD_MATH_PRED (v64si, ilogb, v64df x)
{
FUNCTION_INIT(v64si);
v64si hx, lx, ix;
EXTRACT_WORDS (hx, lx, x);
hx &= 0x7fffffff;
VECTOR_IF (hx < 0x00100000, cond)
VECTOR_RETURN (VECTOR_INIT (-__INT_MAX__), cond & ((hx | lx) == 0)); // FP_ILOGB0
VECTOR_IF2 (hx == 0, cond2, cond)
ix = VECTOR_INIT (-1043);
for (v64si i = lx;
!ALL_ZEROES_P (cond2 & (i > 0));
i <<= 1)
VECTOR_COND_MOVE (ix, ix - 1, cond2 & (i > 0));
VECTOR_ELSE2 (cond2, cond)
ix = VECTOR_INIT (-1022);
for (v64si i = (hx << 11);
!ALL_ZEROES_P (cond2 & (i > 0));
i <<= 1)
VECTOR_COND_MOVE (ix, ix - 1, cond2 & (i > 0));
VECTOR_ENDIF
VECTOR_RETURN (ix, cond);
VECTOR_ENDIF
VECTOR_RETURN ((hx >> 20) - 1023, hx < 0x7ff00000);
VECTOR_RETURN (VECTOR_INIT (__INT_MAX__), NO_COND);
FUNCTION_RETURN;
}
DEF_VARIANTS (ilogb, si, df)
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