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728ad0157c
We should skip vector types which are not SCEVable. test/CodeGen/NVPTX/sched2.ll passes git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235695 91177308-0d34-0410-b5e6-96231b3b80d8
276 lines
9.7 KiB
C++
276 lines
9.7 KiB
C++
//===-- NVPTXTargetMachine.cpp - Define TargetMachine for NVPTX -----------===//
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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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// Top-level implementation for the NVPTX target.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTXTargetMachine.h"
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#include "MCTargetDesc/NVPTXMCAsmInfo.h"
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#include "NVPTX.h"
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#include "NVPTXAllocaHoisting.h"
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#include "NVPTXLowerAggrCopies.h"
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#include "NVPTXTargetObjectFile.h"
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#include "NVPTXTargetTransformInfo.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineFunctionAnalysis.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Transforms/Scalar.h"
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using namespace llvm;
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namespace llvm {
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void initializeNVVMReflectPass(PassRegistry&);
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void initializeGenericToNVVMPass(PassRegistry&);
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void initializeNVPTXAllocaHoistingPass(PassRegistry &);
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void initializeNVPTXAssignValidGlobalNamesPass(PassRegistry&);
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void initializeNVPTXFavorNonGenericAddrSpacesPass(PassRegistry &);
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void initializeNVPTXLowerStructArgsPass(PassRegistry &);
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}
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extern "C" void LLVMInitializeNVPTXTarget() {
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// Register the target.
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RegisterTargetMachine<NVPTXTargetMachine32> X(TheNVPTXTarget32);
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RegisterTargetMachine<NVPTXTargetMachine64> Y(TheNVPTXTarget64);
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// FIXME: This pass is really intended to be invoked during IR optimization,
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// but it's very NVPTX-specific.
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initializeNVVMReflectPass(*PassRegistry::getPassRegistry());
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initializeGenericToNVVMPass(*PassRegistry::getPassRegistry());
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initializeNVPTXAllocaHoistingPass(*PassRegistry::getPassRegistry());
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initializeNVPTXAssignValidGlobalNamesPass(*PassRegistry::getPassRegistry());
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initializeNVPTXFavorNonGenericAddrSpacesPass(
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*PassRegistry::getPassRegistry());
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initializeNVPTXLowerStructArgsPass(*PassRegistry::getPassRegistry());
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}
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static std::string computeDataLayout(bool is64Bit) {
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std::string Ret = "e";
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if (!is64Bit)
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Ret += "-p:32:32";
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Ret += "-i64:64-v16:16-v32:32-n16:32:64";
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return Ret;
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}
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NVPTXTargetMachine::NVPTXTargetMachine(const Target &T, StringRef TT,
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StringRef CPU, StringRef FS,
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const TargetOptions &Options,
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Reloc::Model RM, CodeModel::Model CM,
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CodeGenOpt::Level OL, bool is64bit)
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: LLVMTargetMachine(T, computeDataLayout(is64bit), TT, CPU, FS, Options, RM,
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CM, OL),
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is64bit(is64bit), TLOF(make_unique<NVPTXTargetObjectFile>()),
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Subtarget(TT, CPU, FS, *this) {
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if (Triple(TT).getOS() == Triple::NVCL)
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drvInterface = NVPTX::NVCL;
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else
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drvInterface = NVPTX::CUDA;
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initAsmInfo();
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}
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NVPTXTargetMachine::~NVPTXTargetMachine() {}
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void NVPTXTargetMachine32::anchor() {}
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NVPTXTargetMachine32::NVPTXTargetMachine32(
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const Target &T, StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options, Reloc::Model RM, CodeModel::Model CM,
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CodeGenOpt::Level OL)
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: NVPTXTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {}
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void NVPTXTargetMachine64::anchor() {}
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NVPTXTargetMachine64::NVPTXTargetMachine64(
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const Target &T, StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options, Reloc::Model RM, CodeModel::Model CM,
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CodeGenOpt::Level OL)
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: NVPTXTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {}
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namespace {
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class NVPTXPassConfig : public TargetPassConfig {
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public:
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NVPTXPassConfig(NVPTXTargetMachine *TM, PassManagerBase &PM)
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: TargetPassConfig(TM, PM) {}
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NVPTXTargetMachine &getNVPTXTargetMachine() const {
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return getTM<NVPTXTargetMachine>();
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}
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void addIRPasses() override;
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bool addInstSelector() override;
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void addPostRegAlloc() override;
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void addMachineSSAOptimization() override;
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FunctionPass *createTargetRegisterAllocator(bool) override;
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void addFastRegAlloc(FunctionPass *RegAllocPass) override;
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void addOptimizedRegAlloc(FunctionPass *RegAllocPass) override;
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};
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} // end anonymous namespace
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TargetPassConfig *NVPTXTargetMachine::createPassConfig(PassManagerBase &PM) {
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NVPTXPassConfig *PassConfig = new NVPTXPassConfig(this, PM);
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return PassConfig;
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}
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TargetIRAnalysis NVPTXTargetMachine::getTargetIRAnalysis() {
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return TargetIRAnalysis(
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[this](Function &) { return TargetTransformInfo(NVPTXTTIImpl(this)); });
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}
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void NVPTXPassConfig::addIRPasses() {
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// The following passes are known to not play well with virtual regs hanging
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// around after register allocation (which in our case, is *all* registers).
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// We explicitly disable them here. We do, however, need some functionality
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// of the PrologEpilogCodeInserter pass, so we emulate that behavior in the
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// NVPTXPrologEpilog pass (see NVPTXPrologEpilogPass.cpp).
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disablePass(&PrologEpilogCodeInserterID);
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disablePass(&MachineCopyPropagationID);
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disablePass(&BranchFolderPassID);
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disablePass(&TailDuplicateID);
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addPass(createNVPTXImageOptimizerPass());
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TargetPassConfig::addIRPasses();
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addPass(createNVPTXAssignValidGlobalNamesPass());
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addPass(createGenericToNVVMPass());
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addPass(createNVPTXFavorNonGenericAddrSpacesPass());
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// FavorNonGenericAddrSpaces shortcuts unnecessary addrspacecasts, and leave
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// them unused. We could remove dead code in an ad-hoc manner, but that
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// requires manual work and might be error-prone.
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addPass(createDeadCodeEliminationPass());
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addPass(createSeparateConstOffsetFromGEPPass());
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// ReassociateGEPs exposes more opportunites for SLSR. See
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// the example in reassociate-geps-and-slsr.ll.
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addPass(createStraightLineStrengthReducePass());
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// SeparateConstOffsetFromGEP and SLSR creates common expressions which GVN or
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// EarlyCSE can reuse. GVN generates significantly better code than EarlyCSE
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// for some of our benchmarks.
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if (getOptLevel() == CodeGenOpt::Aggressive)
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addPass(createGVNPass());
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else
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addPass(createEarlyCSEPass());
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// Run NaryReassociate after EarlyCSE/GVN to be more effective.
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addPass(createNaryReassociatePass());
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}
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bool NVPTXPassConfig::addInstSelector() {
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const NVPTXSubtarget &ST = *getTM<NVPTXTargetMachine>().getSubtargetImpl();
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addPass(createLowerAggrCopies());
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addPass(createAllocaHoisting());
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addPass(createNVPTXISelDag(getNVPTXTargetMachine(), getOptLevel()));
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if (!ST.hasImageHandles())
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addPass(createNVPTXReplaceImageHandlesPass());
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return false;
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}
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void NVPTXPassConfig::addPostRegAlloc() {
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addPass(createNVPTXPrologEpilogPass(), false);
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}
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FunctionPass *NVPTXPassConfig::createTargetRegisterAllocator(bool) {
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return nullptr; // No reg alloc
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}
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void NVPTXPassConfig::addFastRegAlloc(FunctionPass *RegAllocPass) {
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assert(!RegAllocPass && "NVPTX uses no regalloc!");
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addPass(&PHIEliminationID);
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addPass(&TwoAddressInstructionPassID);
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}
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void NVPTXPassConfig::addOptimizedRegAlloc(FunctionPass *RegAllocPass) {
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assert(!RegAllocPass && "NVPTX uses no regalloc!");
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addPass(&ProcessImplicitDefsID);
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addPass(&LiveVariablesID);
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addPass(&MachineLoopInfoID);
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addPass(&PHIEliminationID);
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addPass(&TwoAddressInstructionPassID);
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addPass(&RegisterCoalescerID);
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// PreRA instruction scheduling.
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if (addPass(&MachineSchedulerID))
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printAndVerify("After Machine Scheduling");
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addPass(&StackSlotColoringID);
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// FIXME: Needs physical registers
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//addPass(&PostRAMachineLICMID);
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printAndVerify("After StackSlotColoring");
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}
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void NVPTXPassConfig::addMachineSSAOptimization() {
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// Pre-ra tail duplication.
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if (addPass(&EarlyTailDuplicateID))
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printAndVerify("After Pre-RegAlloc TailDuplicate");
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// Optimize PHIs before DCE: removing dead PHI cycles may make more
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// instructions dead.
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addPass(&OptimizePHIsID);
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// This pass merges large allocas. StackSlotColoring is a different pass
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// which merges spill slots.
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addPass(&StackColoringID);
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// If the target requests it, assign local variables to stack slots relative
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// to one another and simplify frame index references where possible.
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addPass(&LocalStackSlotAllocationID);
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// With optimization, dead code should already be eliminated. However
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// there is one known exception: lowered code for arguments that are only
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// used by tail calls, where the tail calls reuse the incoming stack
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// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
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addPass(&DeadMachineInstructionElimID);
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printAndVerify("After codegen DCE pass");
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// Allow targets to insert passes that improve instruction level parallelism,
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// like if-conversion. Such passes will typically need dominator trees and
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// loop info, just like LICM and CSE below.
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if (addILPOpts())
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printAndVerify("After ILP optimizations");
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addPass(&MachineLICMID);
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addPass(&MachineCSEID);
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addPass(&MachineSinkingID);
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printAndVerify("After Machine LICM, CSE and Sinking passes");
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addPass(&PeepholeOptimizerID);
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printAndVerify("After codegen peephole optimization pass");
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}
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