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Diffstat (limited to 'contrib/llvm/lib/Target/PowerPC/PPCSubtarget.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/PowerPC/PPCSubtarget.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/PowerPC/PPCSubtarget.cpp b/contrib/llvm/lib/Target/PowerPC/PPCSubtarget.cpp new file mode 100644 index 0000000..40914ba --- /dev/null +++ b/contrib/llvm/lib/Target/PowerPC/PPCSubtarget.cpp @@ -0,0 +1,138 @@ +//===- 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 TargetSubtarget. +// +//===----------------------------------------------------------------------===// + +#include "PPCSubtarget.h" +#include "PPC.h" +#include "llvm/GlobalValue.h" +#include "llvm/Target/TargetMachine.h" +#include "PPCGenSubtarget.inc" +#include <cstdlib> +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 &FS, + bool is64Bit) + : StackAlignment(16) + , DarwinDirective(PPC::DIR_NONE) + , IsGigaProcessor(false) + , Has64BitSupport(false) + , Use64BitRegs(false) + , IsPPC64(is64Bit) + , HasAltivec(false) + , HasFSQRT(false) + , HasSTFIWX(false) + , HasLazyResolverStubs(false) + , DarwinVers(0) { + + // Determine default and user specified characteristics + std::string CPU = "generic"; +#if defined(__APPLE__) + CPU = GetCurrentPowerPCCPU(); +#endif + + // Parse features string. + ParseSubtargetFeatures(FS, CPU); + + // 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 the boolean corresponding to the current target triple, or the default + // if one cannot be determined, to true. + if (TT.length() > 7) { + // Determine which version of darwin this is. + size_t DarwinPos = TT.find("-darwin"); + if (DarwinPos != std::string::npos) { + if (isdigit(TT[DarwinPos+7])) + DarwinVers = atoi(&TT[DarwinPos+7]); + else + DarwinVers = 8; // Minimum supported darwin is Tiger. + } + } + + // 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; +} + + +/// 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 hae 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; +} |
