1 files changed, 25 insertions, 0 deletions
diff --git a/cpukit/compiler-rt/lib/builtins/bswapdi2.c b/cpukit/compiler-rt/lib/builtins/bswapdi2.c
new file mode 100644
index 0000000000..cd049f58e3
--- /dev/null
+++ b/cpukit/compiler-rt/lib/builtins/bswapdi2.c
@@ -0,0 +1,25 @@
+//===-- bswapdi2.c - Implement __bswapdi2 ---------------------------------===//
+//
+// 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 __bswapdi2 for the compiler_rt library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "int_lib.h"
+
+COMPILER_RT_ABI uint64_t __bswapdi2(uint64_t u) {
+  return (
+      (((u)&0xff00000000000000ULL) >> 56) |
+      (((u)&0x00ff000000000000ULL) >> 40) |
+      (((u)&0x0000ff0000000000ULL) >> 24) |
+      (((u)&0x000000ff00000000ULL) >> 8)  |
+      (((u)&0x00000000ff000000ULL) << 8)  |
+      (((u)&0x0000000000ff0000ULL) << 24) |
+      (((u)&0x000000000000ff00ULL) << 40) |
+      (((u)&0x00000000000000ffULL) << 56));
+}