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      1      1.1  joerg /* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
      2      1.1  joerg  *
      3      1.1  joerg  *                     The LLVM Compiler Infrastructure
      4      1.1  joerg  *
      5      1.1  joerg  * This file is dual licensed under the MIT and the University of Illinois Open
      6      1.1  joerg  * Source Licenses. See LICENSE.TXT for details.
      7      1.1  joerg  *
      8      1.1  joerg  * ===----------------------------------------------------------------------===
      9      1.1  joerg  *
     10      1.1  joerg  * This file implements __muldc3 for the compiler_rt library.
     11      1.1  joerg  *
     12      1.1  joerg  * ===----------------------------------------------------------------------===
     13      1.1  joerg  */
     14      1.1  joerg 
     15      1.1  joerg #include "int_lib.h"
     16      1.1  joerg #include "int_math.h"
     17      1.1  joerg 
     18      1.1  joerg /* Returns: the product of a + ib and c + id */
     19      1.1  joerg 
     20  1.1.1.3  joerg COMPILER_RT_ABI Dcomplex
     21      1.1  joerg __muldc3(double __a, double __b, double __c, double __d)
     22      1.1  joerg {
     23      1.1  joerg     double __ac = __a * __c;
     24      1.1  joerg     double __bd = __b * __d;
     25      1.1  joerg     double __ad = __a * __d;
     26      1.1  joerg     double __bc = __b * __c;
     27  1.1.1.3  joerg     Dcomplex z;
     28  1.1.1.3  joerg     COMPLEX_REAL(z) = __ac - __bd;
     29  1.1.1.3  joerg     COMPLEX_IMAGINARY(z) = __ad + __bc;
     30  1.1.1.3  joerg     if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z)))
     31      1.1  joerg     {
     32      1.1  joerg         int __recalc = 0;
     33      1.1  joerg         if (crt_isinf(__a) || crt_isinf(__b))
     34      1.1  joerg         {
     35      1.1  joerg             __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);
     36      1.1  joerg             __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);
     37      1.1  joerg             if (crt_isnan(__c))
     38      1.1  joerg                 __c = crt_copysign(0, __c);
     39      1.1  joerg             if (crt_isnan(__d))
     40      1.1  joerg                 __d = crt_copysign(0, __d);
     41      1.1  joerg             __recalc = 1;
     42      1.1  joerg         }
     43      1.1  joerg         if (crt_isinf(__c) || crt_isinf(__d))
     44      1.1  joerg         {
     45      1.1  joerg             __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);
     46      1.1  joerg             __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);
     47      1.1  joerg             if (crt_isnan(__a))
     48      1.1  joerg                 __a = crt_copysign(0, __a);
     49      1.1  joerg             if (crt_isnan(__b))
     50      1.1  joerg                 __b = crt_copysign(0, __b);
     51      1.1  joerg             __recalc = 1;
     52      1.1  joerg         }
     53      1.1  joerg         if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
     54      1.1  joerg                           crt_isinf(__ad) || crt_isinf(__bc)))
     55      1.1  joerg         {
     56      1.1  joerg             if (crt_isnan(__a))
     57      1.1  joerg                 __a = crt_copysign(0, __a);
     58      1.1  joerg             if (crt_isnan(__b))
     59      1.1  joerg                 __b = crt_copysign(0, __b);
     60      1.1  joerg             if (crt_isnan(__c))
     61      1.1  joerg                 __c = crt_copysign(0, __c);
     62      1.1  joerg             if (crt_isnan(__d))
     63      1.1  joerg                 __d = crt_copysign(0, __d);
     64      1.1  joerg             __recalc = 1;
     65      1.1  joerg         }
     66      1.1  joerg         if (__recalc)
     67      1.1  joerg         {
     68  1.1.1.3  joerg             COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
     69  1.1.1.3  joerg             COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
     70      1.1  joerg         }
     71      1.1  joerg     }
     72      1.1  joerg     return z;
     73      1.1  joerg }
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