1276789Sdim//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
2276789Sdim//
3276789Sdim//                     The LLVM Compiler Infrastructure
4276789Sdim//
5276789Sdim// This file is dual licensed under the MIT and the University of Illinois Open
6276789Sdim// Source Licenses. See LICENSE.TXT for details.
7276789Sdim//
8276789Sdim//===----------------------------------------------------------------------===//
9276789Sdim
10276789Sdim#include "../assembly.h"
11276789Sdim
12276789Sdim	.syntax unified
13276789Sdim	.text
14276789Sdim#if __ARM_ARCH_ISA_THUMB == 2
15276789Sdim	.thumb
16276789Sdim#endif
17276789Sdim
18276789Sdim//
19276789Sdim// extern uint32_t __bswapsi2(uint32_t);
20276789Sdim//
21276789Sdim// Reverse all the bytes in a 32-bit integer.
22276789Sdim//
23276789Sdim	.p2align 2
24276789Sdim#if __ARM_ARCH_ISA_THUMB == 2
25276789SdimDEFINE_COMPILERRT_THUMB_FUNCTION(__bswapsi2)
26276789Sdim#else
27276789SdimDEFINE_COMPILERRT_FUNCTION(__bswapsi2)
28276789Sdim#endif
29276789Sdim#if __ARM_ARCH < 6
30276789Sdim    // before armv6 does not have "rev" instruction
31276789Sdim 	eor	r1, r0, r0, ror #16
32276789Sdim 	bic	r1, r1, #0xff0000
33276789Sdim 	mov	r1, r1, lsr #8
34276789Sdim 	eor	r0, r1, r0, ror #8
35276789Sdim#else
36276789Sdim    rev r0, r0
37276789Sdim#endif
38276789Sdim    JMP(lr)
39276789SdimEND_COMPILERRT_FUNCTION(__bswapsi2)
40