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 18 DEFINE_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
