blob: 4c365418f08279947c7d288d44a9245209a238b9 (
plain)
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
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// 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;
}
|
