| //===------- bswapdi2 - Implement bswapdi2 --------------------------------===// |
| // |
| // 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 uint64_t __bswapdi2(uint64_t); |
| // |
| // Reverse all the bytes in a 64-bit integer. |
| // |
| .p2align 2 |
| #if __ARM_ARCH_ISA_THUMB == 2 |
| DEFINE_COMPILERRT_THUMB_FUNCTION(__bswapdi2) |
| #else |
| DEFINE_COMPILERRT_FUNCTION(__bswapdi2) |
| #endif |
| #if __ARM_ARCH < 6 |
| // before armv6 does not have "rev" instruction |
| // r2 = rev(r0) |
| eor r2, r0, r0, ror #16 |
| bic r2, r2, #0xff0000 |
| mov r2, r2, lsr #8 |
| eor r2, r2, r0, ror #8 |
| // r0 = rev(r1) |
| eor r0, r1, r1, ror #16 |
| bic r0, r0, #0xff0000 |
| mov r0, r0, lsr #8 |
| eor r0, r0, r1, ror #8 |
| #else |
| rev r2, r0 // r2 = rev(r0) |
| rev r0, r1 // r0 = rev(r1) |
| #endif |
| mov r1, r2 // r1 = r2 = rev(r0) |
| JMP(lr) |
| END_COMPILERRT_FUNCTION(__bswapdi2) |
| |
| NO_EXEC_STACK_DIRECTIVE |
| |
