diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/flt-32/e_log10f.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/flt-32/e_log10f.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/flt-32/e_log10f.c b/REORG.TODO/sysdeps/ieee754/flt-32/e_log10f.c new file mode 100644 index 0000000000..aa21bbc9c5 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/flt-32/e_log10f.c @@ -0,0 +1,54 @@ +/* e_log10f.c -- float version of e_log10.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 <math.h> +#include <math_private.h> +#include <fix-int-fp-convert-zero.h> + +static const float +two25 = 3.3554432000e+07, /* 0x4c000000 */ +ivln10 = 4.3429449201e-01, /* 0x3ede5bd9 */ +log10_2hi = 3.0102920532e-01, /* 0x3e9a2080 */ +log10_2lo = 7.9034151668e-07; /* 0x355427db */ + +float +__ieee754_log10f(float x) +{ + float y,z; + int32_t i,k,hx; + + GET_FLOAT_WORD(hx,x); + + k=0; + if (hx < 0x00800000) { /* x < 2**-126 */ + if (__builtin_expect((hx&0x7fffffff)==0, 0)) + return -two25/__fabsf (x); /* log(+-0)=-inf */ + if (__builtin_expect(hx<0, 0)) + return (x-x)/(x-x); /* log(-#) = NaN */ + k -= 25; x *= two25; /* subnormal number, scale up x */ + GET_FLOAT_WORD(hx,x); + } + if (__builtin_expect(hx >= 0x7f800000, 0)) return x+x; + k += (hx>>23)-127; + i = ((u_int32_t)k&0x80000000)>>31; + hx = (hx&0x007fffff)|((0x7f-i)<<23); + y = (float)(k+i); + if (FIX_INT_FP_CONVERT_ZERO && y == 0.0f) + y = 0.0f; + SET_FLOAT_WORD(x,hx); + z = y*log10_2lo + ivln10*__ieee754_logf(x); + return z+y*log10_2hi; +} +strong_alias (__ieee754_log10f, __log10f_finite) |