From b3a6901e66f55b35aa9e01bcb24134e6a65ea004 Mon Sep 17 00:00:00 2001
From: Daniel Dunbar <daniel@zuster.org>
Date: Fri, 26 Jun 2009 16:47:03 +0000
Subject: Initial import of compiler-rt.  -

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74292 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/divxc3.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 lib/divxc3.c

(limited to 'lib/divxc3.c')

diff --git a/lib/divxc3.c b/lib/divxc3.c
new file mode 100644
index 00000000..4ee09b9d
--- /dev/null
+++ b/lib/divxc3.c
@@ -0,0 +1,62 @@
+//===-- divxc3.c - Implement __divxc3 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __divxc3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#if !_ARCH_PPC
+
+#include "int_lib.h"
+#include <math.h>
+#include <complex.h>
+
+// Returns: the quotient of (a + ib) / (c + id)
+
+long double _Complex
+__divxc3(long double __a, long double __b, long double __c, long double __d)
+{
+    int __ilogbw = 0;
+    long double __logbw = logbl(fmaxl(fabsl(__c), fabsl(__d)));
+    if (isfinite(__logbw))
+    {
+        __ilogbw = (int)__logbw;
+        __c = scalbnl(__c, -__ilogbw);
+        __d = scalbnl(__d, -__ilogbw);
+    }
+    long double __denom = __c * __c + __d * __d;
+    long double _Complex z;
+    __real__ z = scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
+    __imag__ z = scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
+    if (isnan(__real__ z) && isnan(__imag__ z))
+    {
+        if ((__denom == 0) && (!isnan(__a) || !isnan(__b)))
+        {
+            __real__ z = copysignl(INFINITY, __c) * __a;
+            __imag__ z = copysignl(INFINITY, __c) * __b;
+        }
+        else if ((isinf(__a) || isinf(__b)) && isfinite(__c) && isfinite(__d))
+        {
+            __a = copysignl(isinf(__a) ? 1 : 0, __a);
+            __b = copysignl(isinf(__b) ? 1 : 0, __b);
+            __real__ z = INFINITY * (__a * __c + __b * __d);
+            __imag__ z = INFINITY * (__b * __c - __a * __d);
+        }
+        else if (isinf(__logbw) && __logbw > 0 && isfinite(__a) && isfinite(__b))
+        {
+            __c = copysignl(isinf(__c) ? 1 : 0, __c);
+            __d = copysignl(isinf(__d) ? 1 : 0, __d);
+            __real__ z = 0 * (__a * __c + __b * __d);
+            __imag__ z = 0 * (__b * __c - __a * __d);
+        }
+    }
+    return z;
+}
+
+#endif
-- 
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