1 files changed, 55 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/divdc3.c b/contrib/llvm-project/compiler-rt/lib/builtins/divdc3.c
new file mode 100644
index 000000000000..5581182f3bfd
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/divdc3.c
@@ -0,0 +1,55 @@
+//===-- divdc3.c - Implement __divdc3 -------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements __divdc3 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#define DOUBLE_PRECISION
+#include "fp_lib.h"
+#include "int_lib.h"
+#include "int_math.h"
+
+// Returns: the quotient of (a + ib) / (c + id)
+
+COMPILER_RT_ABI Dcomplex __divdc3(double __a, double __b, double __c,
+                                  double __d) {
+  int __ilogbw = 0;
+  double __logbw = __compiler_rt_logb(__compiler_rt_fmax(crt_fabs(__c),
+                                                         crt_fabs(__d)));
+  if (crt_isfinite(__logbw)) {
+    __ilogbw = (int)__logbw;
+    __c = __compiler_rt_scalbn(__c, -__ilogbw);
+    __d = __compiler_rt_scalbn(__d, -__ilogbw);
+  }
+  double __denom = __c * __c + __d * __d;
+  Dcomplex z;
+  COMPLEX_REAL(z) =
+      __compiler_rt_scalbn((__a * __c + __b * __d) / __denom, -__ilogbw);
+  COMPLEX_IMAGINARY(z) =
+      __compiler_rt_scalbn((__b * __c - __a * __d) / __denom, -__ilogbw);
+  if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
+    if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b))) {
+      COMPLEX_REAL(z) = crt_copysign(CRT_INFINITY, __c) * __a;
+      COMPLEX_IMAGINARY(z) = crt_copysign(CRT_INFINITY, __c) * __b;
+    } else if ((crt_isinf(__a) || crt_isinf(__b)) && crt_isfinite(__c) &&
+               crt_isfinite(__d)) {
+      __a = crt_copysign(crt_isinf(__a) ? 1.0 : 0.0, __a);
+      __b = crt_copysign(crt_isinf(__b) ? 1.0 : 0.0, __b);
+      COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
+      COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
+    } else if (crt_isinf(__logbw) && __logbw > 0.0 && crt_isfinite(__a) &&
+               crt_isfinite(__b)) {
+      __c = crt_copysign(crt_isinf(__c) ? 1.0 : 0.0, __c);
+      __d = crt_copysign(crt_isinf(__d) ? 1.0 : 0.0, __d);
+      COMPLEX_REAL(z) = 0.0 * (__a * __c + __b * __d);
+      COMPLEX_IMAGINARY(z) = 0.0 * (__b * __c - __a * __d);
+    }
+  }
+  return z;
+}