blob: 0b86d8b4d874afacbe5b7b832418f5df06b04f34 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
/* This file is distributed under the University of Illinois Open Source
* License. See LICENSE.TXT for details.
*/
/* long double __floatditf(long long x); */
/* This file implements the PowerPC long long -> long double conversion */
#include "DD.h"
long double __floatditf(int64_t a) {
static const double twop32 = 0x1.0p32;
static const double twop52 = 0x1.0p52;
doublebits low = { .d = twop52 };
low.x |= a & UINT64_C(0x00000000ffffffff); /* 0x1.0p52 + low 32 bits of a. */
const double high_addend = (double)((int32_t)(a >> 32))*twop32 - 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;
}
|
