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.p2align 2 18DEFINE_COMPILERRT_FUNCTION(__bswapsi2) 19#if __ARM_ARCH < 6 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 JMP(lr) 29END_COMPILERRT_FUNCTION(__bswapsi2) 30