//===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the PPC specific subclass of TargetSubtargetInfo. // //===----------------------------------------------------------------------===// #include "PPCSubtarget.h" #include "PPCRegisterInfo.h" #include "PPC.h" #include "llvm/GlobalValue.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Support/TargetRegistry.h" #include <cstdlib> #define GET_SUBTARGETINFO_TARGET_DESC #define GET_SUBTARGETINFO_CTOR #include "PPCGenSubtargetInfo.inc" using namespace llvm; #if defined(__APPLE__) #include <mach/mach.h> #include <mach/mach_host.h> #include <mach/host_info.h> #include <mach/machine.h> /// GetCurrentPowerPCFeatures - Returns the current CPUs features. static const char *GetCurrentPowerPCCPU() { host_basic_info_data_t hostInfo; mach_msg_type_number_t infoCount; infoCount = HOST_BASIC_INFO_COUNT; host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo, &infoCount); if (hostInfo.cpu_type != CPU_TYPE_POWERPC) return "generic"; switch(hostInfo.cpu_subtype) { case CPU_SUBTYPE_POWERPC_601: return "601"; case CPU_SUBTYPE_POWERPC_602: return "602"; case CPU_SUBTYPE_POWERPC_603: return "603"; case CPU_SUBTYPE_POWERPC_603e: return "603e"; case CPU_SUBTYPE_POWERPC_603ev: return "603ev"; case CPU_SUBTYPE_POWERPC_604: return "604"; case CPU_SUBTYPE_POWERPC_604e: return "604e"; case CPU_SUBTYPE_POWERPC_620: return "620"; case CPU_SUBTYPE_POWERPC_750: return "750"; case CPU_SUBTYPE_POWERPC_7400: return "7400"; case CPU_SUBTYPE_POWERPC_7450: return "7450"; case CPU_SUBTYPE_POWERPC_970: return "970"; default: ; } return "generic"; } #endif PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU, const std::string &FS, bool is64Bit) : PPCGenSubtargetInfo(TT, CPU, FS) , StackAlignment(16) , DarwinDirective(PPC::DIR_NONE) , IsGigaProcessor(false) , Has64BitSupport(false) , Use64BitRegs(false) , IsPPC64(is64Bit) , HasAltivec(false) , HasFSQRT(false) , HasSTFIWX(false) , IsBookE(false) , HasLazyResolverStubs(false) , IsJITCodeModel(false) , TargetTriple(TT) { // Determine default and user specified characteristics std::string CPUName = CPU; if (CPUName.empty()) CPUName = "generic"; #if defined(__APPLE__) if (CPUName == "generic") CPUName = GetCurrentPowerPCCPU(); #endif // Parse features string. ParseSubtargetFeatures(CPUName, FS); // Initialize scheduling itinerary for the specified CPU. InstrItins = getInstrItineraryForCPU(CPUName); // If we are generating code for ppc64, verify that options make sense. if (is64Bit) { Has64BitSupport = true; // Silently force 64-bit register use on ppc64. Use64BitRegs = true; } // If the user requested use of 64-bit regs, but the cpu selected doesn't // support it, ignore. if (use64BitRegs() && !has64BitSupport()) Use64BitRegs = false; // Set up darwin-specific properties. if (isDarwin()) HasLazyResolverStubs = true; } /// SetJITMode - This is called to inform the subtarget info that we are /// producing code for the JIT. void PPCSubtarget::SetJITMode() { // JIT mode doesn't want lazy resolver stubs, it knows exactly where // everything is. This matters for PPC64, which codegens in PIC mode without // stubs. HasLazyResolverStubs = false; // Calls to external functions need to use indirect calls IsJITCodeModel = true; } /// hasLazyResolverStub - Return true if accesses to the specified global have /// to go through a dyld lazy resolution stub. This means that an extra load /// is required to get the address of the global. bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV, const TargetMachine &TM) const { // We never have stubs if HasLazyResolverStubs=false or if in static mode. if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static) return false; // If symbol visibility is hidden, the extra load is not needed if // the symbol is definitely defined in the current translation unit. bool isDecl = GV->isDeclaration() && !GV->isMaterializable(); if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage()) return false; return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() || isDecl; } bool PPCSubtarget::enablePostRAScheduler( CodeGenOpt::Level OptLevel, TargetSubtargetInfo::AntiDepBreakMode& Mode, RegClassVector& CriticalPathRCs) const { if (DarwinDirective == PPC::DIR_440) return false; Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL; CriticalPathRCs.clear(); if (isPPC64()) CriticalPathRCs.push_back(&PPC::G8RCRegClass); else CriticalPathRCs.push_back(&PPC::GPRCRegClass); return OptLevel >= CodeGenOpt::Default; }