1 //===------- bswapdi2 - Implement bswapdi2 --------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "../assembly.h"
14 #if __ARM_ARCH_ISA_THUMB == 2
19 // extern uint64_t __bswapdi2(uint64_t);
21 // Reverse all the bytes in a 64-bit integer.
24 #if __ARM_ARCH_ISA_THUMB == 2
25 DEFINE_COMPILERRT_THUMB_FUNCTION(__bswapdi2)
27 DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
30 // before armv6 does not have "rev" instruction
32 eor r2, r0, r0, ror #16
35 eor r2, r2, r0, ror #8
37 eor r0, r1, r1, ror #16
40 eor r0, r0, r1, ror #8
42 rev r2, r0 // r2 = rev(r0)
43 rev r0, r1 // r0 = rev(r1)
45 mov r1, r2 // r1 = r2 = rev(r0)
47 END_COMPILERRT_FUNCTION(__bswapdi2)