1 files changed, 52 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/ppc/gcc_qdiv.c b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/gcc_qdiv.c
new file mode 100644
index 000000000000..35a3cbc3d3f8
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/ppc/gcc_qdiv.c
@@ -0,0 +1,52 @@
+// 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
+
+// long double __gcc_qdiv(long double x, long double y);
+// This file implements the PowerPC 128-bit double-double division operation.
+// This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!)
+
+#include "DD.h"
+
+long double __gcc_qdiv(long double a, long double b) {
+  static const uint32_t infinityHi = UINT32_C(0x7ff00000);
+  DD dst = {.ld = a}, src = {.ld = b};
+
+  register double x = dst.s.hi, x1 = dst.s.lo, y = src.s.hi, y1 = src.s.lo;
+
+  double yHi, yLo, qHi, qLo;
+  double yq, tmp, q;
+
+  q = x / y;
+
+  // Detect special cases
+  if (q == 0.0) {
+    dst.s.hi = q;
+    dst.s.lo = 0.0;
+    return dst.ld;
+  }
+
+  const doublebits qBits = {.d = q};
+  if (((uint32_t)(qBits.x >> 32) & infinityHi) == infinityHi) {
+    dst.s.hi = q;
+    dst.s.lo = 0.0;
+    return dst.ld;
+  }
+
+  yHi = high26bits(y);
+  qHi = high26bits(q);
+
+  yq = y * q;
+  yLo = y - yHi;
+  qLo = q - qHi;
+
+  tmp = LOWORDER(yq, yHi, yLo, qHi, qLo);
+  tmp = (x - yq) - tmp;
+  tmp = ((tmp + x1) - y1 * q) / y;
+  x = q + tmp;
+
+  dst.s.lo = (q - x) + tmp;
+  dst.s.hi = x;
+
+  return dst.ld;
+}