75 lines · cpp
1//===-- ARMBaseInfo.cpp - ARM Base encoding information------------===//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// This file provides basic encoding and assembly information for ARM.10//11//===----------------------------------------------------------------------===//12#include "ARMBaseInfo.h"13 14using namespace llvm;15namespace llvm {16ARM::PredBlockMask expandPredBlockMask(ARM::PredBlockMask BlockMask,17 ARMVCC::VPTCodes Kind) {18 using PredBlockMask = ARM::PredBlockMask;19 assert(Kind != ARMVCC::None && "Cannot expand a mask with None!");20 assert(llvm::countr_zero((unsigned)BlockMask) != 0 && "Mask is already full");21 22 auto ChooseMask = [&](PredBlockMask AddedThen, PredBlockMask AddedElse) {23 return Kind == ARMVCC::Then ? AddedThen : AddedElse;24 };25 26 switch (BlockMask) {27 case PredBlockMask::T:28 return ChooseMask(PredBlockMask::TT, PredBlockMask::TE);29 case PredBlockMask::TT:30 return ChooseMask(PredBlockMask::TTT, PredBlockMask::TTE);31 case PredBlockMask::TE:32 return ChooseMask(PredBlockMask::TET, PredBlockMask::TEE);33 case PredBlockMask::TTT:34 return ChooseMask(PredBlockMask::TTTT, PredBlockMask::TTTE);35 case PredBlockMask::TTE:36 return ChooseMask(PredBlockMask::TTET, PredBlockMask::TTEE);37 case PredBlockMask::TET:38 return ChooseMask(PredBlockMask::TETT, PredBlockMask::TETE);39 case PredBlockMask::TEE:40 return ChooseMask(PredBlockMask::TEET, PredBlockMask::TEEE);41 default:42 llvm_unreachable("Unknown Mask");43 }44}45 46namespace ARMSysReg {47 48// lookup system register using 12-bit SYSm value.49// Note: the search is uniqued using M1 mask50const MClassSysReg *lookupMClassSysRegBy12bitSYSmValue(unsigned SYSm) {51 return lookupMClassSysRegByM1Encoding12(SYSm);52}53 54// returns APSR with _<bits> qualifier.55// Note: ARMv7-M deprecates using MSR APSR without a _<bits> qualifier56const MClassSysReg *lookupMClassSysRegAPSRNonDeprecated(unsigned SYSm) {57 return lookupMClassSysRegByM2M3Encoding8((1<<9)|(SYSm & 0xFF));58}59 60// lookup system registers using 8-bit SYSm value61const MClassSysReg *lookupMClassSysRegBy8bitSYSmValue(unsigned SYSm) {62 return ARMSysReg::lookupMClassSysRegByM2M3Encoding8((1<<8)|(SYSm & 0xFF));63}64 65#define GET_MClassSysRegsList_IMPL66#include "ARMGenSystemRegister.inc"67 68} // end namespace ARMSysReg69 70namespace ARMBankedReg {71#define GET_BankedRegsList_IMPL72#include "ARMGenSystemRegister.inc"73} // end namespce ARMSysReg74} // end namespace llvm75