- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/* This file is distributed under the University of Illinois Open Source
|
|
* License. See LICENSE.TXT for details.
|
|
*/
|
|
|
|
/* long double __floatunditf(unsigned long long x); */
|
|
/* This file implements the PowerPC unsigned long long -> long double conversion */
|
|
|
|
#include "DD.h"
|
|
|
|
long double __floatunditf(uint64_t a) {
|
|
|
|
/* Begins with an exact copy of the code from __floatundidf */
|
|
|
|
static const double twop52 = 0x1.0p52;
|
|
static const double twop84 = 0x1.0p84;
|
|
static const double twop84_plus_twop52 = 0x1.00000001p84;
|
|
|
|
doublebits high = { .d = twop84 };
|
|
doublebits low = { .d = twop52 };
|
|
|
|
high.x |= a >> 32; /* 0x1.0p84 + high 32 bits of a */
|
|
low.x |= a & UINT64_C(0x00000000ffffffff); /* 0x1.0p52 + low 32 bits of a */
|
|
|
|
const double high_addend = high.d - twop84_plus_twop52;
|
|
|
|
/* At this point, we have two double precision numbers
|
|
* high_addend and low.d, and we wish to return their sum
|
|
* as a canonicalized long double:
|
|
*/
|
|
|
|
/* This implementation sets the inexact flag spuriously. */
|
|
/* This could be avoided, but at some substantial cost. */
|
|
|
|
DD result;
|
|
|
|
result.s.hi = high_addend + low.d;
|
|
result.s.lo = (high_addend - result.s.hi) + low.d;
|
|
|
|
return result.ld;
|
|
|
|
}
|