| 1 | //===-- muldc3.c - Implement __muldc3 -------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements __muldc3 for the compiler_rt library. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "int_lib.h" |
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| 14 | #include "int_math.h" |
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| 15 | |
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| 16 | // Returns: the product of a + ib and c + id |
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| 17 | |
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| 18 | COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c, |
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| 19 | double __d) { |
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| 20 | double __ac = __a * __c; |
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| 21 | double __bd = __b * __d; |
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| 22 | double __ad = __a * __d; |
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| 23 | double __bc = __b * __c; |
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| 24 | Dcomplex z; |
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| 25 | COMPLEX_REAL(z) = __ac - __bd; |
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| 26 | COMPLEX_IMAGINARY(z) = __ad + __bc; |
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| 27 | if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) { |
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| 28 | int __recalc = 0; |
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| 29 | if (crt_isinf(__a) || crt_isinf(__b)) { |
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| 30 | __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a); |
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| 31 | __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b); |
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| 32 | if (crt_isnan(__c)) |
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| 33 | __c = crt_copysign(0, __c); |
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| 34 | if (crt_isnan(__d)) |
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| 35 | __d = crt_copysign(0, __d); |
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| 36 | __recalc = 1; |
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| 37 | } |
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| 38 | if (crt_isinf(__c) || crt_isinf(__d)) { |
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| 39 | __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c); |
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| 40 | __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d); |
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| 41 | if (crt_isnan(__a)) |
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| 42 | __a = crt_copysign(0, __a); |
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| 43 | if (crt_isnan(__b)) |
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| 44 | __b = crt_copysign(0, __b); |
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| 45 | __recalc = 1; |
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| 46 | } |
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| 47 | if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) || |
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| 48 | crt_isinf(__bc))) { |
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| 49 | if (crt_isnan(__a)) |
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| 50 | __a = crt_copysign(0, __a); |
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| 51 | if (crt_isnan(__b)) |
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| 52 | __b = crt_copysign(0, __b); |
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| 53 | if (crt_isnan(__c)) |
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| 54 | __c = crt_copysign(0, __c); |
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| 55 | if (crt_isnan(__d)) |
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| 56 | __d = crt_copysign(0, __d); |
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| 57 | __recalc = 1; |
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| 58 | } |
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| 59 | if (__recalc) { |
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| 60 | COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d); |
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| 61 | COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c); |
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| 62 | } |
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| 63 | } |
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| 64 | return z; |
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| 65 | } |
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| 66 | |
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