| //===------- bswapsi2 - Implement bswapsi2 --------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "../assembly.h" |
| |
| .syntax unified |
| .text |
| DEFINE_CODE_STATE |
| |
| // |
| // extern uint32_t __bswapsi2(uint32_t); |
| // |
| // Reverse all the bytes in a 32-bit integer. |
| // |
| .p2align 2 |
| DEFINE_COMPILERRT_FUNCTION(__bswapsi2) |
| #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) |
| |
| NO_EXEC_STACK_DIRECTIVE |
| |
