| Stephen Hines | 2d1fdb2 | 2014-05-28 23:58:16 -0700 | [diff] [blame^] | 1 | /* ===-- mulsc3.c - Implement __mulsc3 -------------------------------------=== |
| 2 | * |
| 3 | * The LLVM Compiler Infrastructure |
| 4 | * |
| 5 | * This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | * Source Licenses. See LICENSE.TXT for details. |
| 7 | * |
| 8 | * ===----------------------------------------------------------------------=== |
| 9 | * |
| 10 | * This file implements __mulsc3 for the compiler_rt library. |
| 11 | * |
| 12 | * ===----------------------------------------------------------------------=== |
| 13 | */ |
| 14 | |
| 15 | #include "int_lib.h" |
| 16 | #include "int_math.h" |
| 17 | |
| 18 | /* Returns: the product of a + ib and c + id */ |
| 19 | |
| 20 | COMPILER_RT_ABI float _Complex |
| 21 | __mulsc3(float __a, float __b, float __c, float __d) |
| 22 | { |
| 23 | float __ac = __a * __c; |
| 24 | float __bd = __b * __d; |
| 25 | float __ad = __a * __d; |
| 26 | float __bc = __b * __c; |
| 27 | float _Complex z; |
| 28 | __real__ z = __ac - __bd; |
| 29 | __imag__ z = __ad + __bc; |
| 30 | if (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) |
| 31 | { |
| 32 | int __recalc = 0; |
| 33 | if (crt_isinf(__a) || crt_isinf(__b)) |
| 34 | { |
| 35 | __a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a); |
| 36 | __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b); |
| 37 | if (crt_isnan(__c)) |
| 38 | __c = crt_copysignf(0, __c); |
| 39 | if (crt_isnan(__d)) |
| 40 | __d = crt_copysignf(0, __d); |
| 41 | __recalc = 1; |
| 42 | } |
| 43 | if (crt_isinf(__c) || crt_isinf(__d)) |
| 44 | { |
| 45 | __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c); |
| 46 | __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d); |
| 47 | if (crt_isnan(__a)) |
| 48 | __a = crt_copysignf(0, __a); |
| 49 | if (crt_isnan(__b)) |
| 50 | __b = crt_copysignf(0, __b); |
| 51 | __recalc = 1; |
| 52 | } |
| 53 | if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || |
| 54 | crt_isinf(__ad) || crt_isinf(__bc))) |
| 55 | { |
| 56 | if (crt_isnan(__a)) |
| 57 | __a = crt_copysignf(0, __a); |
| 58 | if (crt_isnan(__b)) |
| 59 | __b = crt_copysignf(0, __b); |
| 60 | if (crt_isnan(__c)) |
| 61 | __c = crt_copysignf(0, __c); |
| 62 | if (crt_isnan(__d)) |
| 63 | __d = crt_copysignf(0, __d); |
| 64 | __recalc = 1; |
| 65 | } |
| 66 | if (__recalc) |
| 67 | { |
| 68 | __real__ z = CRT_INFINITY * (__a * __c - __b * __d); |
| 69 | __imag__ z = CRT_INFINITY * (__a * __d + __b * __c); |
| 70 | } |
| 71 | } |
| 72 | return z; |
| 73 | } |