mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 05:51:10 +00:00
9e97f239ea
Remove the wordsize-64 implementations by merging them into the main dbl-64 directory. The second patch just moves all wordsize-64 files and removes a few wordsize-64 uses in comments and Implies files. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/* Rewritten for 64-bit machines by Ulrich Drepper <drepper@gmail.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.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* modf(double x, 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>
|
|
#include <libm-alias-double.h>
|
|
#include <stdint.h>
|
|
|
|
static const double one = 1.0;
|
|
|
|
double
|
|
__modf(double x, double *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;
|
|
}
|
|
}
|
|
#ifndef __modf
|
|
libm_alias_double (__modf, modf)
|
|
#endif
|