67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
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/* s_ceilf.c -- float version of s_ceil.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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__ceilf (float x)
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{
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#if USE_CEILF_BUILTIN
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return __builtin_ceilf (x);
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#else
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/* Use generic implementation. */
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int32_t i0, j0;
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uint32_t i;
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GET_FLOAT_WORD (i0, x);
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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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/* return 0 * sign (x) if |x| < 1 */
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if (i0 < 0)
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i0 = 0x80000000;
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else if (i0 != 0)
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i0 = 0x3f800000;
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}
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else
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{
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i = (0x007fffff) >> j0;
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if ((i0 & i) == 0)
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return x; /* x is integral */
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if (i0 > 0)
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i0 += (0x00800000) >> j0;
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i0 &= (~i);
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}
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}
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else
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{
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if (__glibc_unlikely (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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SET_FLOAT_WORD (x, i0);
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return x;
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#endif /* ! USE_CEILF_BUILTIN */
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}
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#ifndef __ceilf
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libm_alias_float (__ceil, ceil)
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#endif
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