projects / rustc.git / blame
| Commit | Line | Data |
|---|---|---|
| 1a4d82fc JJ |
1 | /* ===-- muldc3.c - Implement __muldc3 -------------------------------------=== |
| 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 __muldc3 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 | ||
| 92a42be0 | 20 | COMPILER_RT_ABI Dcomplex |
| 1a4d82fc JJ |
21 | __muldc3(double __a, double __b, double __c, double __d) |
| 22 | { | |
| 23 | double __ac = __a * __c; | |
| 24 | double __bd = __b * __d; | |
| 25 | double __ad = __a * __d; | |
| 26 | double __bc = __b * __c; | |
| 92a42be0 SL |
27 | Dcomplex z; |
| 28 | COMPLEX_REAL(z) = __ac - __bd; | |
| 29 | COMPLEX_IMAGINARY(z) = __ad + __bc; | |
| 30 | if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) | |
| 1a4d82fc JJ |
31 | { |
| 32 | int __recalc = 0; | |
| 33 | if (crt_isinf(__a) || crt_isinf(__b)) | |
| 34 | { | |
| 35 | __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a); | |
| 36 | __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b); | |
| 37 | if (crt_isnan(__c)) | |
| 38 | __c = crt_copysign(0, __c); | |
| 39 | if (crt_isnan(__d)) | |
| 40 | __d = crt_copysign(0, __d); | |
| 41 | __recalc = 1; | |
| 42 | } | |
| 43 | if (crt_isinf(__c) || crt_isinf(__d)) | |
| 44 | { | |
| 45 | __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c); | |
| 46 | __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d); | |
| 47 | if (crt_isnan(__a)) | |
| 48 | __a = crt_copysign(0, __a); | |
| 49 | if (crt_isnan(__b)) | |
| 50 | __b = crt_copysign(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_copysign(0, __a); | |
| 58 | if (crt_isnan(__b)) | |
| 59 | __b = crt_copysign(0, __b); | |
| 60 | if (crt_isnan(__c)) | |
| 61 | __c = crt_copysign(0, __c); | |
| 62 | if (crt_isnan(__d)) | |
| 63 | __d = crt_copysign(0, __d); | |
| 64 | __recalc = 1; | |
| 65 | } | |
| 66 | if (__recalc) | |
| 67 | { | |
| 92a42be0 SL |
68 | COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d); |
| 69 | COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c); | |
| 1a4d82fc JJ |
70 | } |
| 71 | } | |
| 72 | return z; | |
| 73 | } |