compiler-rt/lib/builtins/mulxc3.c

   1 //===-- mulxc3.c - Implement __mulxc3 -------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements __mulxc3 for the compiler_rt library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #if !_ARCH_PPC
  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 Lcomplex __mulxc3(long double __a, long double __b,
  21                                   long double __c, long double __d) {
  22   long double __ac = __a * __c;
  23   long double __bd = __b * __d;
  24   long double __ad = __a * __d;
  25   long double __bc = __b * __c;
  26   Lcomplex z;
  27   COMPLEX_REAL(z) = __ac - __bd;
  28   COMPLEX_IMAGINARY(z) = __ad + __bc;
  29   if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
  30     int __recalc = 0;
  31     if (crt_isinf(__a) || crt_isinf(__b)) {
  32       __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
  33       __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
  34       if (crt_isnan(__c))
  35         __c = crt_copysignl(0, __c);
  36       if (crt_isnan(__d))
  37         __d = crt_copysignl(0, __d);
  38       __recalc = 1;
  39     }
  40     if (crt_isinf(__c) || crt_isinf(__d)) {
  41       __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
  42       __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
  43       if (crt_isnan(__a))
  44         __a = crt_copysignl(0, __a);
  45       if (crt_isnan(__b))
  46         __b = crt_copysignl(0, __b);
  47       __recalc = 1;
  48     }
  49     if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
  50                       crt_isinf(__bc))) {
  51       if (crt_isnan(__a))
  52         __a = crt_copysignl(0, __a);
  53       if (crt_isnan(__b))
  54         __b = crt_copysignl(0, __b);
  55       if (crt_isnan(__c))
  56         __c = crt_copysignl(0, __c);
  57       if (crt_isnan(__d))
  58         __d = crt_copysignl(0, __d);
  59       __recalc = 1;
  60     }
  61     if (__recalc) {
  62       COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
  63       COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
  64     }
  65   }
  66   return z;
  67 }
  68
  69 #endif