63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
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/* s_rintf.c -- float version of s_rint.c.
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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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#define NO_MATH_REDIRECT
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-float.h>
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#include <math-use-builtins.h>
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float
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__rintf (float x)
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{
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#if USE_RINTF_BUILTIN
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return __builtin_rintf (x);
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#else
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/* Use generic implementation. */
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static const float
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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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int32_t i0, j0, sx;
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float w, t;
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GET_FLOAT_WORD (i0, x);
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sx = (i0 >> 31) & 1;
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j0 = ((i0 >> 23) & 0xff) - 0x7f;
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if (j0 < 23)
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{
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if(j0 < 0)
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{
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w = TWO23[sx] + x;
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t = w - TWO23[sx];
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GET_FLOAT_WORD (i0, t);
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SET_FLOAT_WORD (t, (i0 & 0x7fffffff) | (sx << 31));
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return t;
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}
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}
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else
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{
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if (j0 == 0x80)
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return x + x; /* inf or NaN */
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else
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return x; /* x is integral */
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}
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w = TWO23[sx] + x;
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return w - TWO23[sx];
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#endif /* ! USE_RINTF_BUILTIN */
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}
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#ifndef __rintf
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libm_alias_float (__rint, rint)
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#endif
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