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-rw-r--r--lib/builtins/multc3.c68
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diff --git a/lib/builtins/multc3.c b/lib/builtins/multc3.c
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+/* ===-- multc3.c - Implement __multc3 -------------------------------------===
+ *
+ * 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 __multc3 for the compiler_rt library.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include "int_math.h"
+
+/* Returns: the product of a + ib and c + id */
+
+COMPILER_RT_ABI long double _Complex
+__multc3(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 (crt_isnan(__real__ z) && crt_isnan(__imag__ z)) {
+ int recalc = 0;
+ if (crt_isinf(a) || crt_isinf(b)) {
+ a = crt_copysignl(crt_isinf(a) ? 1 : 0, a);
+ b = crt_copysignl(crt_isinf(b) ? 1 : 0, b);
+ if (crt_isnan(c))
+ c = crt_copysignl(0, c);
+ if (crt_isnan(d))
+ d = crt_copysignl(0, d);
+ recalc = 1;
+ }
+ if (crt_isinf(c) || crt_isinf(d)) {
+ c = crt_copysignl(crt_isinf(c) ? 1 : 0, c);
+ d = crt_copysignl(crt_isinf(d) ? 1 : 0, d);
+ if (crt_isnan(a))
+ a = crt_copysignl(0, a);
+ if (crt_isnan(b))
+ b = crt_copysignl(0, b);
+ recalc = 1;
+ }
+ if (!recalc && (crt_isinf(ac) || crt_isinf(bd) ||
+ crt_isinf(ad) || crt_isinf(bc))) {
+ if (crt_isnan(a))
+ a = crt_copysignl(0, a);
+ if (crt_isnan(b))
+ b = crt_copysignl(0, b);
+ if (crt_isnan(c))
+ c = crt_copysignl(0, c);
+ if (crt_isnan(d))
+ d = crt_copysignl(0, d);
+ recalc = 1;
+ }
+ if (recalc) {
+ __real__ z = CRT_INFINITY * (a * c - b * d);
+ __imag__ z = CRT_INFINITY * (a * d + b * c);
+ }
+ }
+ return z;
+}