Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 1 | /*===-- divsc3.c - Implement __divsc3 -------------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
Howard Hinnant | 9ad441f | 2010-11-16 22:13:33 +0000 | [diff] [blame] | 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __divsc3 for the compiler_rt library. |
| 11 | * |
| 12 | *===----------------------------------------------------------------------=== |
| 13 | */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 14 | |
| 15 | #include "int_lib.h" |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 16 | #include "int_math.h" |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 17 | #include <math.h> |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 18 | |
Edward O'Callaghan | 37a6a45 | 2009-08-07 20:30:09 +0000 | [diff] [blame] | 19 | /* Returns: the quotient of (a + ib) / (c + id) */ |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 20 | |
| 21 | float _Complex |
| 22 | __divsc3(float __a, float __b, float __c, float __d) |
| 23 | { |
| 24 | int __ilogbw = 0; |
| 25 | float __logbw = logbf(fmaxf(fabsf(__c), fabsf(__d))); |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 26 | if (crt_isfinite(__logbw)) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 27 | { |
| 28 | __ilogbw = (int)__logbw; |
| 29 | __c = scalbnf(__c, -__ilogbw); |
| 30 | __d = scalbnf(__d, -__ilogbw); |
| 31 | } |
| 32 | float __denom = __c * __c + __d * __d; |
| 33 | float _Complex z; |
| 34 | __real__ z = scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw); |
| 35 | __imag__ z = scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw); |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 36 | if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 37 | { |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 38 | if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b))) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 39 | { |
| 40 | __real__ z = copysignf(INFINITY, __c) * __a; |
| 41 | __imag__ z = copysignf(INFINITY, __c) * __b; |
| 42 | } |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 43 | else if ((crt_isinf(__a) || crt_isinf(__b)) && |
| 44 | crt_isfinite(__c) && crt_isfinite(__d)) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 45 | { |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 46 | __a = copysignf(crt_isinf(__a) ? 1 : 0, __a); |
| 47 | __b = copysignf(crt_isinf(__b) ? 1 : 0, __b); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 48 | __real__ z = INFINITY * (__a * __c + __b * __d); |
| 49 | __imag__ z = INFINITY * (__b * __c - __a * __d); |
| 50 | } |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 51 | else if (crt_isinf(__logbw) && __logbw > 0 && |
| 52 | crt_isfinite(__a) && crt_isfinite(__b)) |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 53 | { |
Daniel Dunbar | 8603024 | 2011-11-16 07:33:00 +0000 | [diff] [blame^] | 54 | __c = copysignf(crt_isinf(__c) ? 1 : 0, __c); |
| 55 | __d = copysignf(crt_isinf(__d) ? 1 : 0, __d); |
Daniel Dunbar | b3a6901 | 2009-06-26 16:47:03 +0000 | [diff] [blame] | 56 | __real__ z = 0 * (__a * __c + __b * __d); |
| 57 | __imag__ z = 0 * (__b * __c - __a * __d); |
| 58 | } |
| 59 | } |
| 60 | return z; |
| 61 | } |