1//===------- bswapsi2 - Implement bswapsi2 --------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is dual licensed under the MIT and the University of Illinois Open
6// Source Licenses. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "../assembly.h"
11
12//
13// extern uint32_t __bswapsi2(uint32_t);
14//
15// Reverse all the bytes in a 32-bit integer.
16//
17.align 2
18DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
19#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
20    // before armv6 does not have "rev" instruction
21 	eor	r1, r0, r0, ror #16
22 	bic	r1, r1, #0xff0000
23 	mov	r1, r1, lsr #8
24 	eor	r0, r1, r0, ror #8
25#else
26    rev r0, r0
27#endif
28    bx  lr
29