Move original compiler-rt functions (libgcc replacement) to lib/builtins directory

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201393 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 60 insertions, 0 deletions

diff --git a/lib/builtins/divsc3.c b/lib/builtins/divsc3.c
new file mode 100644
index 000000000..caa0c4075
--- /dev/null
+++ b/lib/builtins/divsc3.c
@@ -0,0 +1,60 @@
+/*===-- divsc3.c - Implement __divsc3 -------------------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is dual licensed under the MIT and the University of Illinois Open
+ * Source Licenses. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ *
+ * This file implements __divsc3 for the compiler_rt library.
+ *
+ *===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include "int_math.h"
+
+/* Returns: the quotient of (a + ib) / (c + id) */
+
+float _Complex
+__divsc3(float __a, float __b, float __c, float __d)
+{
+    int __ilogbw = 0;
+    float __logbw = crt_logbf(crt_fmaxf(crt_fabsf(__c), crt_fabsf(__d)));
+    if (crt_isfinite(__logbw))
+    {
+        __ilogbw = (int)__logbw;
+        __c = crt_scalbnf(__c, -__ilogbw);
+        __d = crt_scalbnf(__d, -__ilogbw);
+    }
+    float __denom = __c * __c + __d * __d;
+    float _Complex z;
+    __real__ z = crt_scalbnf((__a * __c + __b * __d) / __denom, -__ilogbw);
+    __imag__ z = crt_scalbnf((__b * __c - __a * __d) / __denom, -__ilogbw);
+    if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
+    {
+        if ((__denom == 0) && (!crt_isnan(__a) || !crt_isnan(__b)))
+        {
+            __real__ z = crt_copysignf(CRT_INFINITY, __c) * __a;
+            __imag__ z = crt_copysignf(CRT_INFINITY, __c) * __b;
+        }
+        else if ((crt_isinf(__a) || crt_isinf(__b)) &&
+                 crt_isfinite(__c) && crt_isfinite(__d))
+        {
+            __a = crt_copysignf(crt_isinf(__a) ? 1 : 0, __a);
+            __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b);
+            __real__ z = CRT_INFINITY * (__a * __c + __b * __d);
+            __imag__ z = CRT_INFINITY * (__b * __c - __a * __d);
+        }
+        else if (crt_isinf(__logbw) && __logbw > 0 &&
+                 crt_isfinite(__a) && crt_isfinite(__b))
+        {
+            __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);
+            __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);
+            __real__ z = 0 * (__a * __c + __b * __d);
+            __imag__ z = 0 * (__b * __c - __a * __d);
+        }
+    }
+    return z;
+}