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1//===------- bswapdi2 - Implement bswapdi2 --------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "../assembly.h"10 11 .syntax unified12 .text13 DEFINE_CODE_STATE14 15//16// extern uint64_t __bswapdi2(uint64_t);17//18// Reverse all the bytes in a 64-bit integer.19//20 .p2align 221DEFINE_COMPILERRT_FUNCTION(__bswapdi2)22#if __ARM_ARCH < 623 // before armv6 does not have "rev" instruction24 // r2 = rev(r0)25 eor r2, r0, r0, ror #1626 bic r2, r2, #0xff000027 mov r2, r2, lsr #828 eor r2, r2, r0, ror #829 // r0 = rev(r1)30 eor r0, r1, r1, ror #1631 bic r0, r0, #0xff000032 mov r0, r0, lsr #833 eor r0, r0, r1, ror #834#else35 rev r2, r0 // r2 = rev(r0)36 rev r0, r1 // r0 = rev(r1)37#endif38 mov r1, r2 // r1 = r2 = rev(r0)39 JMP(lr)40END_COMPILERRT_FUNCTION(__bswapdi2)41 42NO_EXEC_STACK_DIRECTIVE43 44