1*7c3d14c8STreehugger Robot//===------- bswapsi2 - Implement bswapsi2 --------------------------------===// 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 uint32_t __bswapsi2(uint32_t); 20*7c3d14c8STreehugger Robot// 21*7c3d14c8STreehugger Robot// Reverse all the bytes in a 32-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(__bswapsi2) 26*7c3d14c8STreehugger Robot#else 27*7c3d14c8STreehugger RobotDEFINE_COMPILERRT_FUNCTION(__bswapsi2) 28*7c3d14c8STreehugger Robot#endif 29*7c3d14c8STreehugger Robot#if __ARM_ARCH < 6 30*7c3d14c8STreehugger Robot // before armv6 does not have "rev" instruction 31*7c3d14c8STreehugger Robot eor r1, r0, r0, ror #16 32*7c3d14c8STreehugger Robot bic r1, r1, #0xff0000 33*7c3d14c8STreehugger Robot mov r1, r1, lsr #8 34*7c3d14c8STreehugger Robot eor r0, r1, r0, ror #8 35*7c3d14c8STreehugger Robot#else 36*7c3d14c8STreehugger Robot rev r0, r0 37*7c3d14c8STreehugger Robot#endif 38*7c3d14c8STreehugger Robot JMP(lr) 39*7c3d14c8STreehugger RobotEND_COMPILERRT_FUNCTION(__bswapsi2) 40*7c3d14c8STreehugger Robot 41*7c3d14c8STreehugger RobotNO_EXEC_STACK_DIRECTIVE 42*7c3d14c8STreehugger Robot 43