diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-96/s_modfl.c')
-rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-96/s_modfl.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-96/s_modfl.c b/REORG.TODO/sysdeps/ieee754/ldbl-96/s_modfl.c new file mode 100644 index 0000000000..e9401d0f5d --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-96/s_modfl.c @@ -0,0 +1,73 @@ +/* s_modfl.c -- long double version of s_modf.c. + * Conversion to long double by Ulrich Drepper, + * Cygnus Support, drepper@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. + * ==================================================== + */ + +/* + * modfl(long double x, long double *iptr) + * return fraction part of x, and return x's integral part in *iptr. + * Method: + * Bit twiddling. + * + * Exception: + * No exception. + */ + +#include <math.h> +#include <math_private.h> + +static const long double one = 1.0; + +long double +__modfl(long double x, long double *iptr) +{ + int32_t i0,i1,j0; + u_int32_t i,se; + GET_LDOUBLE_WORDS(se,i0,i1,x); + j0 = (se&0x7fff)-0x3fff; /* exponent of x */ + if(j0<32) { /* integer part in high x */ + if(j0<0) { /* |x|<1 */ + SET_LDOUBLE_WORDS(*iptr,se&0x8000,0,0); /* *iptr = +-0 */ + return x; + } else { + i = (0x7fffffff)>>j0; + if(((i0&i)|i1)==0) { /* x is integral */ + *iptr = x; + SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ + return x; + } else { + SET_LDOUBLE_WORDS(*iptr,se,i0&(~i),0); + return x - *iptr; + } + } + } else if (__builtin_expect(j0>63, 0)) { /* no fraction part */ + *iptr = x*one; + /* We must handle NaNs separately. */ + if (j0 == 0x4000 && ((i0 & 0x7fffffff) | i1)) + return x*one; + SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ + return x; + } else { /* fraction part in low x */ + i = ((u_int32_t)(0x7fffffff))>>(j0-32); + if((i1&i)==0) { /* x is integral */ + *iptr = x; + SET_LDOUBLE_WORDS(x,se&0x8000,0,0); /* return +-0 */ + return x; + } else { + SET_LDOUBLE_WORDS(*iptr,se,i0,i1&(~i)); + return x - *iptr; + } + } +} +weak_alias (__modfl, modfl) |