diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_modf.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_modf.c | 80 |
1 files changed, 30 insertions, 50 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_modf.c b/sysdeps/ieee754/dbl-64/s_modf.c index 722511c64a..8d14e78ef0 100644 --- a/sysdeps/ieee754/dbl-64/s_modf.c +++ b/sysdeps/ieee754/dbl-64/s_modf.c @@ -1,3 +1,4 @@ +/* Rewritten for 64-bit machines by Ulrich Drepper <drepper@gmail.com>. */ /* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. @@ -22,63 +23,42 @@ #include <math.h> #include <math_private.h> #include <libm-alias-double.h> +#include <stdint.h> static const double one = 1.0; double -__modf (double x, double *iptr) +__modf(double x, double *iptr) { - int32_t i0, i1, j0; - uint32_t i; - EXTRACT_WORDS (i0, i1, x); - j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; /* exponent of x */ - if (j0 < 20) /* integer part in high x */ - { - if (j0 < 0) /* |x|<1 */ - { - INSERT_WORDS (*iptr, i0 & 0x80000000, 0); /* *iptr = +-0 */ - return x; - } - else - { - i = (0x000fffff) >> j0; - if (((i0 & i) | i1) == 0) /* x is integral */ - { - *iptr = x; - INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */ - return x; - } - else - { - INSERT_WORDS (*iptr, i0 & (~i), 0); - return x - *iptr; + int64_t i0; + int32_t j0; + EXTRACT_WORDS64(i0,x); + j0 = ((i0>>52)&0x7ff)-0x3ff; /* exponent of x */ + if(j0<52) { /* integer part in x */ + if(j0<0) { /* |x|<1 */ + /* *iptr = +-0 */ + INSERT_WORDS64(*iptr,i0&UINT64_C(0x8000000000000000)); + return x; + } else { + uint64_t i = UINT64_C(0x000fffffffffffff)>>j0; + if((i0&i)==0) { /* x is integral */ + *iptr = x; + /* return +-0 */ + INSERT_WORDS64(x,i0&UINT64_C(0x8000000000000000)); + return x; + } else { + INSERT_WORDS64(*iptr,i0&(~i)); + return x - *iptr; + } } + } else { /* no fraction part */ + *iptr = x*one; + /* We must handle NaNs separately. */ + if (j0 == 0x400 && (i0 & UINT64_C(0xfffffffffffff))) + return x*one; + INSERT_WORDS64(x,i0&UINT64_C(0x8000000000000000)); /* return +-0 */ + return x; } - } - else if (__glibc_unlikely (j0 > 51)) /* no fraction part */ - { - *iptr = x * one; - /* We must handle NaNs separately. */ - if (j0 == 0x400 && ((i0 & 0xfffff) | i1)) - return x * one; - INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */ - return x; - } - else /* fraction part in low x */ - { - i = ((uint32_t) (0xffffffff)) >> (j0 - 20); - if ((i1 & i) == 0) /* x is integral */ - { - *iptr = x; - INSERT_WORDS (x, i0 & 0x80000000, 0); /* return +-0 */ - return x; - } - else - { - INSERT_WORDS (*iptr, i0, i1 & (~i)); - return x - *iptr; - } - } } #ifndef __modf libm_alias_double (__modf, modf) |