blob: 6da81f7a05bf23341c2cc934c6feed08fe65109f (
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
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//===-- floatdidf.c - Implement __floatdidf -------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements __floatdidf for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
// Returns: convert a to a double, rounding toward even.
// Assumption: double is a IEEE 64 bit floating point type
// di_int is a 64 bit integral type
// seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm
// mmmm
#ifndef __SOFTFP__
// Support for systems that have hardware floating-point; we'll set the inexact
// flag as a side-effect of this computation.
COMPILER_RT_ABI double __floatdidf(di_int a) {
static const double twop52 = 4503599627370496.0; // 0x1.0p52
static const double twop32 = 4294967296.0; // 0x1.0p32
union {
int64_t x;
double d;
} low = {.d = twop52};
const double high = (int32_t)(a >> 32) * twop32;
low.x |= a & INT64_C(0x00000000ffffffff);
const double result = (high - twop52) + low.d;
return result;
}
#else
// Support for systems that don't have hardware floating-point; there are no
// flags to set, and we don't want to code-gen to an unknown soft-float
// implementation.
#define SRC_I64
#define DST_DOUBLE
#include "int_to_fp_impl.inc"
COMPILER_RT_ABI double __floatdidf(di_int a) { return __floatXiYf__(a); }
#endif
#if defined(__ARM_EABI__)
#if defined(COMPILER_RT_ARMHF_TARGET)
AEABI_RTABI double __aeabi_l2d(di_int a) { return __floatdidf(a); }
#else
COMPILER_RT_ALIAS(__floatdidf, __aeabi_l2d)
#endif
#endif
#if defined(__MINGW32__) && defined(__arm__)
COMPILER_RT_ALIAS(__floatdidf, __i64tod)
#endif
|
