diff options
Diffstat (limited to 'src/math/ceilf.c')
| -rw-r--r-- | src/math/ceilf.c | 65 |
1 files changed, 19 insertions, 46 deletions
diff --git a/src/math/ceilf.c b/src/math/ceilf.c index fec945b6..869835f3 100644 --- a/src/math/ceilf.c +++ b/src/math/ceilf.c @@ -1,54 +1,27 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/s_ceilf.c */ -/* - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - #include "libm.h" -static const float huge = 1.0e30; - float ceilf(float x) { - int32_t i0,j0; - uint32_t i; + union {float f; uint32_t i;} u = {x}; + int e = (int)(u.i >> 23 & 0xff) - 0x7f; + uint32_t m; - GET_FLOAT_WORD(i0, x); - j0 = ((i0>>23)&0xff) - 0x7f; - if (j0 < 23) { - if (j0 < 0) { - /* raise inexact if x != 0 */ - if (huge+x > 0.0f) { - if (i0 < 0) - i0 = 0x80000000; - else if(i0 != 0) - i0 = 0x3f800000; - } - } else { - i = 0x007fffff>>j0; - if ((i0&i) == 0) - return x; /* x is integral */ - /* raise inexact flag */ - if (huge+x > 0.0f) { - if (i0 > 0) - i0 += 0x00800000>>j0; - i0 &= ~i; - } - } + if (e >= 23) + return x; + if (e >= 0) { + m = 0x007fffff >> e; + if ((u.i & m) == 0) + return x; + FORCE_EVAL(x + 0x1p120f); + if (u.i >> 31 == 0) + u.i += m; + u.i &= ~m; } else { - if (j0 == 0x80) /* inf or NaN */ - return x+x; - return x; /* x is integral */ + FORCE_EVAL(x + 0x1p120f); + if (u.i >> 31) + u.f = -0.0; + else if (u.i << 1) + u.f = 1.0; } - SET_FLOAT_WORD(x, i0); - return x; + return u.f; } |