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-rw-r--r--lib/mulxc3.c77
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diff --git a/lib/mulxc3.c b/lib/mulxc3.c
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+//===-- mulxc3.c - Implement __mulxc3 -------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __mulxc3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+#include <math.h>
+#include <complex.h>
+
+// Returns: the product of a + ib and c + id
+
+long double _Complex
+__mulxc3(long double __a, long double __b, long double __c, long double __d)
+{
+ long double __ac = __a * __c;
+ long double __bd = __b * __d;
+ long double __ad = __a * __d;
+ long double __bc = __b * __c;
+ long double _Complex z;
+ __real__ z = __ac - __bd;
+ __imag__ z = __ad + __bc;
+ if (isnan(__real__ z) && isnan(__imag__ z))
+ {
+ int __recalc = 0;
+ if (isinf(__a) || isinf(__b))
+ {
+ __a = copysignl(isinf(__a) ? 1 : 0, __a);
+ __b = copysignl(isinf(__b) ? 1 : 0, __b);
+ if (isnan(__c))
+ __c = copysignl(0, __c);
+ if (isnan(__d))
+ __d = copysignl(0, __d);
+ __recalc = 1;
+ }
+ if (isinf(__c) || isinf(__d))
+ {
+ __c = copysignl(isinf(__c) ? 1 : 0, __c);
+ __d = copysignl(isinf(__d) ? 1 : 0, __d);
+ if (isnan(__a))
+ __a = copysignl(0, __a);
+ if (isnan(__b))
+ __b = copysignl(0, __b);
+ __recalc = 1;
+ }
+ if (!__recalc && (isinf(__ac) || isinf(__bd) ||
+ isinf(__ad) || isinf(__bc)))
+ {
+ if (isnan(__a))
+ __a = copysignl(0, __a);
+ if (isnan(__b))
+ __b = copysignl(0, __b);
+ if (isnan(__c))
+ __c = copysignl(0, __c);
+ if (isnan(__d))
+ __d = copysignl(0, __d);
+ __recalc = 1;
+ }
+ if (__recalc)
+ {
+ __real__ z = INFINITY * (__a * __c - __b * __d);
+ __imag__ z = INFINITY * (__a * __d + __b * __c);
+ }
+ }
+ return z;
+}
+
+#endif