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5b17297b3d
Previously print+verify passes were added in a very unsystematic way, which is annoying when debugging as you miss intermediate steps and allows bugs to stay unnotice when no verification is performed. To make this change practical I added the possibility to explicitely disable verification. I used this option on all places where no verification was performed previously (because alot of places actually don't pass the MachineVerifier). In the long term these problems should be fixed properly and verification enabled after each pass. I'll enable some more verification in subsequent commits. This is the 2nd attempt at this after realizing that PassManager::add() may actually delete the pass. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224059 91177308-0d34-0410-b5e6-96231b3b80d8
103 lines
4.0 KiB
C++
103 lines
4.0 KiB
C++
//===-- SystemZTargetMachine.cpp - Define TargetMachine for SystemZ -------===//
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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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#include "SystemZTargetMachine.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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using namespace llvm;
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extern "C" void LLVMInitializeSystemZTarget() {
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// Register the target.
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RegisterTargetMachine<SystemZTargetMachine> X(TheSystemZTarget);
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}
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SystemZTargetMachine::SystemZTargetMachine(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)
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: LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
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TLOF(make_unique<TargetLoweringObjectFileELF>()),
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Subtarget(TT, CPU, FS, *this) {
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initAsmInfo();
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}
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SystemZTargetMachine::~SystemZTargetMachine() {}
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namespace {
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/// SystemZ Code Generator Pass Configuration Options.
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class SystemZPassConfig : public TargetPassConfig {
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public:
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SystemZPassConfig(SystemZTargetMachine *TM, PassManagerBase &PM)
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: TargetPassConfig(TM, PM) {}
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SystemZTargetMachine &getSystemZTargetMachine() const {
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return getTM<SystemZTargetMachine>();
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}
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void addIRPasses() override;
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bool addInstSelector() override;
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void addPreSched2() override;
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void addPreEmitPass() override;
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};
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} // end anonymous namespace
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void SystemZPassConfig::addIRPasses() {
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TargetPassConfig::addIRPasses();
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}
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bool SystemZPassConfig::addInstSelector() {
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addPass(createSystemZISelDag(getSystemZTargetMachine(), getOptLevel()));
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return false;
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}
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void SystemZPassConfig::addPreSched2() {
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if (getOptLevel() != CodeGenOpt::None &&
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getSystemZTargetMachine().getSubtargetImpl()->hasLoadStoreOnCond())
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addPass(&IfConverterID);
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}
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void SystemZPassConfig::addPreEmitPass() {
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// We eliminate comparisons here rather than earlier because some
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// transformations can change the set of available CC values and we
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// generally want those transformations to have priority. This is
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// especially true in the commonest case where the result of the comparison
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// is used by a single in-range branch instruction, since we will then
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// be able to fuse the compare and the branch instead.
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//
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// For example, two-address NILF can sometimes be converted into
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// three-address RISBLG. NILF produces a CC value that indicates whether
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// the low word is zero, but RISBLG does not modify CC at all. On the
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// other hand, 64-bit ANDs like NILL can sometimes be converted to RISBG.
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// The CC value produced by NILL isn't useful for our purposes, but the
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// value produced by RISBG can be used for any comparison with zero
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// (not just equality). So there are some transformations that lose
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// CC values (while still being worthwhile) and others that happen to make
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// the CC result more useful than it was originally.
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//
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// Another reason is that we only want to use BRANCH ON COUNT in cases
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// where we know that the count register is not going to be spilled.
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//
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// Doing it so late makes it more likely that a register will be reused
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// between the comparison and the branch, but it isn't clear whether
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// preventing that would be a win or not.
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if (getOptLevel() != CodeGenOpt::None)
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addPass(createSystemZElimComparePass(getSystemZTargetMachine()), false);
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if (getOptLevel() != CodeGenOpt::None)
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addPass(createSystemZShortenInstPass(getSystemZTargetMachine()), false);
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addPass(createSystemZLongBranchPass(getSystemZTargetMachine()));
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}
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TargetPassConfig *SystemZTargetMachine::createPassConfig(PassManagerBase &PM) {
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return new SystemZPassConfig(this, PM);
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}
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