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-rw-r--r--lib/builtins/divtc3.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/builtins/divtc3.c b/lib/builtins/divtc3.c
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+/*===-- divtc3.c - Implement __divtc3 -------------------------------------===
+ *
+ * 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 __divtc3 for the compiler_rt library.
+ *
+ *===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include "int_math.h"
+
+/* Returns: the quotient of (a + ib) / (c + id) */
+
+COMPILER_RT_ABI long double _Complex
+__divtc3(long double __a, long double __b, long double __c, long double __d)
+{
+ int __ilogbw = 0;
+ long double __logbw = crt_logbl(crt_fmaxl(crt_fabsl(__c), crt_fabsl(__d)));
+ if (crt_isfinite(__logbw))
+ {
+ __ilogbw = (int)__logbw;
+ __c = crt_scalbnl(__c, -__ilogbw);
+ __d = crt_scalbnl(__d, -__ilogbw);
+ }
+ long double __denom = __c * __c + __d * __d;
+ long double _Complex z;
+ __real__ z = crt_scalbnl((__a * __c + __b * __d) / __denom, -__ilogbw);
+ __imag__ z = crt_scalbnl((__b * __c - __a * __d) / __denom, -__ilogbw);
+ if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
+ {
+ if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b)))
+ {
+ __real__ z = crt_copysignl(CRT_INFINITY, __c) * __a;
+ __imag__ z = crt_copysignl(CRT_INFINITY, __c) * __b;
+ }
+ else if ((crt_isinf(__a) || crt_isinf(__b)) &&
+ crt_isfinite(__c) && crt_isfinite(__d))
+ {
+ __a = crt_copysignl(crt_isinf(__a) ? 1.0 : 0.0, __a);
+ __b = crt_copysignl(crt_isinf(__b) ? 1.0 : 0.0, __b);
+ __real__ z = CRT_INFINITY * (__a * __c + __b * __d);
+ __imag__ z = CRT_INFINITY * (__b * __c - __a * __d);
+ }
+ else if (crt_isinf(__logbw) && __logbw > 0.0 &&
+ crt_isfinite(__a) && crt_isfinite(__b))
+ {
+ __c = crt_copysignl(crt_isinf(__c) ? 1.0 : 0.0, __c);
+ __d = crt_copysignl(crt_isinf(__d) ? 1.0 : 0.0, __d);
+ __real__ z = 0.0 * (__a * __c + __b * __d);
+ __imag__ z = 0.0 * (__b * __c - __a * __d);
+ }
+ }
+ return z;
+}