compiler-rt/lib/builtins/bswapdi2.c

   1 //===-- bswapdi2.c - Implement __bswapdi2 ---------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements __bswapdi2 for the compiler_rt library.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "int_lib.h"
  14
  15 COMPILER_RT_ABI uint64_t __bswapdi2(uint64_t u) {
  16   return (
  17       (((u)&0xff00000000000000ULL) >> 56) |
  18       (((u)&0x00ff000000000000ULL) >> 40) |
  19       (((u)&0x0000ff0000000000ULL) >> 24) |
  20       (((u)&0x000000ff00000000ULL) >> 8)  |
  21       (((u)&0x00000000ff000000ULL) << 8)  |
  22       (((u)&0x0000000000ff0000ULL) << 24) |
  23       (((u)&0x000000000000ff00ULL) << 40) |
  24       (((u)&0x00000000000000ffULL) << 56));
  25 }