1*7c3d14c8STreehugger Robot//===------- bswapdi2 - Implement bswapdi2 --------------------------------===// 2*7c3d14c8STreehugger Robot// 3*7c3d14c8STreehugger Robot// The LLVM Compiler Infrastructure 4*7c3d14c8STreehugger Robot// 5*7c3d14c8STreehugger Robot// This file is dual licensed under the MIT and the University of Illinois Open 6*7c3d14c8STreehugger Robot// Source Licenses. See LICENSE.TXT for details. 7*7c3d14c8STreehugger Robot// 8*7c3d14c8STreehugger Robot//===----------------------------------------------------------------------===// 9*7c3d14c8STreehugger Robot 10*7c3d14c8STreehugger Robot#include "../assembly.h" 11*7c3d14c8STreehugger Robot 12*7c3d14c8STreehugger Robot .syntax unified 13*7c3d14c8STreehugger Robot .text 14*7c3d14c8STreehugger Robot#if __ARM_ARCH_ISA_THUMB == 2 15*7c3d14c8STreehugger Robot .thumb 16*7c3d14c8STreehugger Robot#endif 17*7c3d14c8STreehugger Robot 18*7c3d14c8STreehugger Robot// 19*7c3d14c8STreehugger Robot// extern uint64_t __bswapdi2(uint64_t); 20*7c3d14c8STreehugger Robot// 21*7c3d14c8STreehugger Robot// Reverse all the bytes in a 64-bit integer. 22*7c3d14c8STreehugger Robot// 23*7c3d14c8STreehugger Robot .p2align 2 24*7c3d14c8STreehugger Robot#if __ARM_ARCH_ISA_THUMB == 2 25*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_THUMB_FUNCTION(__bswapdi2) 26*7c3d14c8STreehugger Robot#else 27*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_FUNCTION(__bswapdi2) 28*7c3d14c8STreehugger Robot#endif 29*7c3d14c8STreehugger Robot#if __ARM_ARCH < 6 30*7c3d14c8STreehugger Robot // before armv6 does not have "rev" instruction 31*7c3d14c8STreehugger Robot // r2 = rev(r0) 32*7c3d14c8STreehugger Robot eor r2, r0, r0, ror #16 33*7c3d14c8STreehugger Robot bic r2, r2, #0xff0000 34*7c3d14c8STreehugger Robot mov r2, r2, lsr #8 35*7c3d14c8STreehugger Robot eor r2, r2, r0, ror #8 36*7c3d14c8STreehugger Robot // r0 = rev(r1) 37*7c3d14c8STreehugger Robot eor r0, r1, r1, ror #16 38*7c3d14c8STreehugger Robot bic r0, r0, #0xff0000 39*7c3d14c8STreehugger Robot mov r0, r0, lsr #8 40*7c3d14c8STreehugger Robot eor r0, r0, r1, ror #8 41*7c3d14c8STreehugger Robot#else 42*7c3d14c8STreehugger Robot rev r2, r0 // r2 = rev(r0) 43*7c3d14c8STreehugger Robot rev r0, r1 // r0 = rev(r1) 44*7c3d14c8STreehugger Robot#endif 45*7c3d14c8STreehugger Robot mov r1, r2 // r1 = r2 = rev(r0) 46*7c3d14c8STreehugger Robot JMP(lr) 47*7c3d14c8STreehugger RobotEND_COMPILERRT_FUNCTION(__bswapdi2) 48*7c3d14c8STreehugger Robot 49*7c3d14c8STreehugger RobotNO_EXEC_STACK_DIRECTIVE 50*7c3d14c8STreehugger Robot 51