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
|
//===-- divsc3.c - Implement __divsc3 -------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements __divsc3 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <math.h>
#include <complex.h>
// Returns: the quotient of (a + ib) / (c + id)
float _Complex
__divsc3(float __a, float __b, float __c, float __d)
{
int __ilogbw = 0;
float __logbw = logbf(fmaxf(fabsf(__c), fabsf(__d)));
if (isfinite(__logbw))
{
__ilogbw = (int)__logbw;
__c = scalbnf(__c, -__ilogbw);
__d = scalbnf(__d, -__ilogbw);
}
float __denom = __c * __c + __d * __d;
float _Complex z;
__real__ z = scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);
__imag__ z = scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw);
if (isnan(__real__ z) && isnan(__imag__ z))
{
if ((__denom == 0) && (!isnan(__a) || !isnan(__b)))
{
__real__ z = copysignf(INFINITY, __c) * __a;
__imag__ z = copysignf(INFINITY, __c) * __b;
}
else if ((isinf(__a) || isinf(__b)) && isfinite(__c) && isfinite(__d))
{
__a = copysignf(isinf(__a) ? 1 : 0, __a);
__b = copysignf(isinf(__b) ? 1 : 0, __b);
__real__ z = INFINITY * (__a * __c + __b * __d);
__imag__ z = INFINITY * (__b * __c - __a * __d);
}
else if (isinf(__logbw) && __logbw > 0 && isfinite(__a) && isfinite(__b))
{
__c = copysignf(isinf(__c) ? 1 : 0, __c);
__d = copysignf(isinf(__d) ? 1 : 0, __d);
__real__ z = 0 * (__a * __c + __b * __d);
__imag__ z = 0 * (__b * __c - __a * __d);
}
}
return z;
}
|
