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276365dd4b
be the first encoded as the first feature. It then uses the CPU name to look up features / scheduling itineray even though clients know full well the CPU name being used to query these properties. The fix is to just have the clients explictly pass the CPU name! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134127 91177308-0d34-0410-b5e6-96231b3b80d8
133 lines
4.3 KiB
C++
133 lines
4.3 KiB
C++
//===- PowerPCSubtarget.cpp - PPC Subtarget Information -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the PPC specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#include "PPCSubtarget.h"
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#include "PPC.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Target/TargetMachine.h"
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#include "PPCGenSubtarget.inc"
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#include <cstdlib>
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using namespace llvm;
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#if defined(__APPLE__)
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#include <mach/mach.h>
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#include <mach/mach_host.h>
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#include <mach/host_info.h>
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#include <mach/machine.h>
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/// GetCurrentPowerPCFeatures - Returns the current CPUs features.
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static const char *GetCurrentPowerPCCPU() {
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host_basic_info_data_t hostInfo;
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mach_msg_type_number_t infoCount;
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infoCount = HOST_BASIC_INFO_COUNT;
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host_info(mach_host_self(), HOST_BASIC_INFO, (host_info_t)&hostInfo,
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&infoCount);
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if (hostInfo.cpu_type != CPU_TYPE_POWERPC) return "generic";
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switch(hostInfo.cpu_subtype) {
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case CPU_SUBTYPE_POWERPC_601: return "601";
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case CPU_SUBTYPE_POWERPC_602: return "602";
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case CPU_SUBTYPE_POWERPC_603: return "603";
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case CPU_SUBTYPE_POWERPC_603e: return "603e";
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case CPU_SUBTYPE_POWERPC_603ev: return "603ev";
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case CPU_SUBTYPE_POWERPC_604: return "604";
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case CPU_SUBTYPE_POWERPC_604e: return "604e";
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case CPU_SUBTYPE_POWERPC_620: return "620";
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case CPU_SUBTYPE_POWERPC_750: return "750";
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case CPU_SUBTYPE_POWERPC_7400: return "7400";
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case CPU_SUBTYPE_POWERPC_7450: return "7450";
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case CPU_SUBTYPE_POWERPC_970: return "970";
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default: ;
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}
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return "generic";
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}
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#endif
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PPCSubtarget::PPCSubtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS, bool is64Bit)
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: StackAlignment(16)
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, DarwinDirective(PPC::DIR_NONE)
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, IsGigaProcessor(false)
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, Has64BitSupport(false)
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, Use64BitRegs(false)
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, IsPPC64(is64Bit)
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, HasAltivec(false)
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, HasFSQRT(false)
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, HasSTFIWX(false)
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, HasLazyResolverStubs(false)
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, IsJITCodeModel(false)
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, TargetTriple(TT) {
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// Determine default and user specified characteristics
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std::string CPUName = CPU;
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if (CPUName.empty())
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CPUName = "generic";
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#if defined(__APPLE__)
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if (CPUName == "generic")
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CPUName = GetCurrentPowerPCCPU();
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#endif
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// Parse features string.
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ParseSubtargetFeatures(FS, CPUName);
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// If we are generating code for ppc64, verify that options make sense.
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if (is64Bit) {
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Has64BitSupport = true;
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// Silently force 64-bit register use on ppc64.
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Use64BitRegs = true;
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}
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// If the user requested use of 64-bit regs, but the cpu selected doesn't
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// support it, ignore.
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if (use64BitRegs() && !has64BitSupport())
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Use64BitRegs = false;
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// Set up darwin-specific properties.
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if (isDarwin())
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HasLazyResolverStubs = true;
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}
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/// SetJITMode - This is called to inform the subtarget info that we are
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/// producing code for the JIT.
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void PPCSubtarget::SetJITMode() {
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// JIT mode doesn't want lazy resolver stubs, it knows exactly where
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// everything is. This matters for PPC64, which codegens in PIC mode without
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// stubs.
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HasLazyResolverStubs = false;
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// Calls to external functions need to use indirect calls
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IsJITCodeModel = true;
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}
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/// hasLazyResolverStub - Return true if accesses to the specified global have
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/// to go through a dyld lazy resolution stub. This means that an extra load
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/// is required to get the address of the global.
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bool PPCSubtarget::hasLazyResolverStub(const GlobalValue *GV,
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const TargetMachine &TM) const {
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// We never have stubs if HasLazyResolverStubs=false or if in static mode.
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if (!HasLazyResolverStubs || TM.getRelocationModel() == Reloc::Static)
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return false;
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// If symbol visibility is hidden, the extra load is not needed if
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// the symbol is definitely defined in the current translation unit.
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bool isDecl = GV->isDeclaration() && !GV->isMaterializable();
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if (GV->hasHiddenVisibility() && !isDecl && !GV->hasCommonLinkage())
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return false;
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return GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() ||
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GV->hasCommonLinkage() || isDecl;
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}
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