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 .syntax unified 13 .text 14 #if __ARM_ARCH_ISA_THUMB == 2 15 .thumb 16 #endif 17 18 // 19 // extern uint32_t __bswapsi2(uint32_t); 20 // 21 // Reverse all the bytes in a 32-bit integer. 22 // 23 .p2align 2 24 DEFINE_COMPILERRT_FUNCTION(__bswapsi2) 25 #if __ARM_ARCH < 6 26 // before armv6 does not have "rev" instruction 27 eor r1, r0, r0, ror #16 28 bic r1, r1, #0xff0000 29 mov r1, r1, lsr #8 30 eor r0, r1, r0, ror #8 31 #else 32 rev r0, r0 33 #endif 34 JMP(lr) 35 END_COMPILERRT_FUNCTION(__bswapsi2) 36
