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/mulsc3.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 lib/mulsc3.c

(limited to 'lib/mulsc3.c')

diff --git a/lib/mulsc3.c b/lib/mulsc3.c
new file mode 100644
index 000000000..bc47a47ea
--- /dev/null
+++ b/lib/mulsc3.c
@@ -0,0 +1,73 @@
+//===-- mulsc3.c - Implement __mulsc3 -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __mulsc3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+#include <math.h>
+#include <complex.h>
+
+// Returns: the product of a + ib and c + id
+
+float _Complex
+__mulsc3(float __a, float __b, float __c, float __d)
+{
+    float __ac = __a * __c;
+    float __bd = __b * __d;
+    float __ad = __a * __d;
+    float __bc = __b * __c;
+    float _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 = copysignf(isinf(__a) ? 1 : 0, __a);
+            __b = copysignf(isinf(__b) ? 1 : 0, __b);
+            if (isnan(__c))
+                __c = copysignf(0, __c);
+            if (isnan(__d))
+                __d = copysignf(0, __d);
+            __recalc = 1;
+        }
+        if (isinf(__c) || isinf(__d))
+        {
+            __c = copysignf(isinf(__c) ? 1 : 0, __c);
+            __d = copysignf(isinf(__d) ? 1 : 0, __d);
+            if (isnan(__a))
+                __a = copysignf(0, __a);
+            if (isnan(__b))
+                __b = copysignf(0, __b);
+            __recalc = 1;
+        }
+        if (!__recalc && (isinf(__ac) || isinf(__bd) ||
+                          isinf(__ad) || isinf(__bc)))
+        {
+            if (isnan(__a))
+                __a = copysignf(0, __a);
+            if (isnan(__b))
+                __b = copysignf(0, __b);
+            if (isnan(__c))
+                __c = copysignf(0, __c);
+            if (isnan(__d))
+                __d = copysignf(0, __d);
+            __recalc = 1;
+        }
+        if (__recalc)
+        {
+            __real__ z = INFINITY * (__a * __c - __b * __d);
+            __imag__ z = INFINITY * (__a * __d + __b * __c);
+        }
+    }
+    return z;
+}
-- 
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