| //===------- bswapsi2 - Implement bswapsi2 --------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is dual licensed under the MIT and the University of Illinois Open |
| // Source Licenses. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "../assembly.h" |
| |
| .syntax unified |
| .text |
| #if __ARM_ARCH_ISA_THUMB == 2 |
| .thumb |
| #endif |
| |
| // |
| // extern uint32_t __bswapsi2(uint32_t); |
| // |
| // Reverse all the bytes in a 32-bit integer. |
| // |
| .p2align 2 |
| #if __ARM_ARCH_ISA_THUMB == 2 |
| DEFINE_COMPILERRT_THUMB_FUNCTION(__bswapsi2) |
| #else |
| DEFINE_COMPILERRT_FUNCTION(__bswapsi2) |
| #endif |
| #if __ARM_ARCH < 6 |
| // before armv6 does not have "rev" instruction |
| eor r1, r0, r0, ror #16 |
| bic r1, r1, #0xff0000 |
| mov r1, r1, lsr #8 |
| eor r0, r1, r0, ror #8 |
| #else |
| rev r0, r0 |
| #endif |
| JMP(lr) |
| END_COMPILERRT_FUNCTION(__bswapsi2) |
