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This pass precomputes CFG block frequency information that can be used by the register allocator to find optimal spill code placement. Given an interference pattern, placeSpills() will compute which basic blocks should have the current variable enter or exit in a register, and which blocks prefer the stack. The algorithm is ready to consume block frequencies from profiling data, but for now it gets by with the static estimates used for spill weights. This is a work in progress and still not hooked up to RegAllocGreedy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122938 91177308-0d34-0410-b5e6-96231b3b80d8
242 lines
9.2 KiB
C++
242 lines
9.2 KiB
C++
//===-- Passes.h - Target independent code generation passes ----*- C++ -*-===//
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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 defines interfaces to access the target independent code generation
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// passes provided by the LLVM backend.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_PASSES_H
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#define LLVM_CODEGEN_PASSES_H
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#include "llvm/Target/TargetMachine.h"
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#include <string>
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namespace llvm {
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class FunctionPass;
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class MachineFunctionPass;
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class PassInfo;
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class TargetLowering;
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class RegisterCoalescer;
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class raw_ostream;
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/// createUnreachableBlockEliminationPass - The LLVM code generator does not
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/// work well with unreachable basic blocks (what live ranges make sense for a
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/// block that cannot be reached?). As such, a code generator should either
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/// not instruction select unreachable blocks, or run this pass as its
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/// last LLVM modifying pass to clean up blocks that are not reachable from
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/// the entry block.
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FunctionPass *createUnreachableBlockEliminationPass();
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/// MachineFunctionPrinter pass - This pass prints out the machine function to
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/// the given stream as a debugging tool.
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MachineFunctionPass *
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createMachineFunctionPrinterPass(raw_ostream &OS,
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const std::string &Banner ="");
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/// MachineLoopInfo pass - This pass is a loop analysis pass.
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///
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extern char &MachineLoopInfoID;
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/// MachineLoopRanges pass - This pass is an on-demand loop coverage
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/// analysis pass.
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///
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extern char &MachineLoopRangesID;
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/// MachineDominators pass - This pass is a machine dominators analysis pass.
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///
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extern char &MachineDominatorsID;
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/// EdgeBundles analysis - Bundle machine CFG edges.
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///
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extern char &EdgeBundlesID;
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/// PHIElimination pass - This pass eliminates machine instruction PHI nodes
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/// by inserting copy instructions. This destroys SSA information, but is the
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/// desired input for some register allocators. This pass is "required" by
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/// these register allocator like this: AU.addRequiredID(PHIEliminationID);
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///
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extern char &PHIEliminationID;
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/// StrongPHIElimination pass - This pass eliminates machine instruction PHI
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/// nodes by inserting copy instructions. This destroys SSA information, but
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/// is the desired input for some register allocators. This pass is
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/// "required" by these register allocator like this:
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/// AU.addRequiredID(PHIEliminationID);
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/// This pass is still in development
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extern char &StrongPHIEliminationID;
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extern char &PreAllocSplittingID;
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/// LiveStacks pass. An analysis keeping track of the liveness of stack slots.
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extern char &LiveStacksID;
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/// SimpleRegisterCoalescing pass. Aggressively coalesces every register
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/// copy it can.
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///
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extern char &SimpleRegisterCoalescingID;
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/// TwoAddressInstruction pass - This pass reduces two-address instructions to
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/// use two operands. This destroys SSA information but it is desired by
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/// register allocators.
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extern char &TwoAddressInstructionPassID;
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/// SpillPlacement analysis. Suggest optimal placement of spill code between
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/// basic blocks.
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///
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extern char &SpillPlacementID;
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/// UnreachableMachineBlockElimination pass - This pass removes unreachable
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/// machine basic blocks.
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extern char &UnreachableMachineBlockElimID;
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/// DeadMachineInstructionElim pass - This pass removes dead machine
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/// instructions.
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///
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FunctionPass *createDeadMachineInstructionElimPass();
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/// Creates a register allocator as the user specified on the command line, or
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/// picks one that matches OptLevel.
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///
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FunctionPass *createRegisterAllocator(CodeGenOpt::Level OptLevel);
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/// FastRegisterAllocation Pass - This pass register allocates as fast as
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/// possible. It is best suited for debug code where live ranges are short.
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///
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FunctionPass *createFastRegisterAllocator();
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/// BasicRegisterAllocation Pass - This pass implements a degenerate global
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/// register allocator using the basic regalloc framework.
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///
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FunctionPass *createBasicRegisterAllocator();
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/// Greedy register allocation pass - This pass implements a global register
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/// allocator for optimized builds.
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///
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FunctionPass *createGreedyRegisterAllocator();
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/// LinearScanRegisterAllocation Pass - This pass implements the linear scan
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/// register allocation algorithm, a global register allocator.
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///
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FunctionPass *createLinearScanRegisterAllocator();
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/// PBQPRegisterAllocation Pass - This pass implements the Partitioned Boolean
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/// Quadratic Prograaming (PBQP) based register allocator.
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///
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FunctionPass *createDefaultPBQPRegisterAllocator();
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/// SimpleRegisterCoalescing Pass - Coalesce all copies possible. Can run
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/// independently of the register allocator.
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///
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RegisterCoalescer *createSimpleRegisterCoalescer();
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/// PrologEpilogCodeInserter Pass - This pass inserts prolog and epilog code,
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/// and eliminates abstract frame references.
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///
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FunctionPass *createPrologEpilogCodeInserter();
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/// LowerSubregs Pass - This pass lowers subregs to register-register copies
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/// which yields suboptimal, but correct code if the register allocator
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/// cannot coalesce all subreg operations during allocation.
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///
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FunctionPass *createLowerSubregsPass();
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/// createPostRAScheduler - This pass performs post register allocation
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/// scheduling.
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FunctionPass *createPostRAScheduler(CodeGenOpt::Level OptLevel);
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/// BranchFolding Pass - This pass performs machine code CFG based
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/// optimizations to delete branches to branches, eliminate branches to
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/// successor blocks (creating fall throughs), and eliminating branches over
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/// branches.
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FunctionPass *createBranchFoldingPass(bool DefaultEnableTailMerge);
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/// TailDuplicate Pass - Duplicate blocks with unconditional branches
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/// into tails of their predecessors.
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FunctionPass *createTailDuplicatePass(bool PreRegAlloc = false);
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/// IfConverter Pass - This pass performs machine code if conversion.
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FunctionPass *createIfConverterPass();
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/// Code Placement Pass - This pass optimize code placement and aligns loop
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/// headers to target specific alignment boundary.
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FunctionPass *createCodePlacementOptPass();
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/// IntrinsicLowering Pass - Performs target-independent LLVM IR
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/// transformations for highly portable strategies.
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FunctionPass *createGCLoweringPass();
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/// MachineCodeAnalysis Pass - Target-independent pass to mark safe points in
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/// machine code. Must be added very late during code generation, just prior
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/// to output, and importantly after all CFG transformations (such as branch
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/// folding).
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FunctionPass *createGCMachineCodeAnalysisPass();
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/// Deleter Pass - Releases GC metadata.
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///
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FunctionPass *createGCInfoDeleter();
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/// Creates a pass to print GC metadata.
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///
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FunctionPass *createGCInfoPrinter(raw_ostream &OS);
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/// createMachineCSEPass - This pass performs global CSE on machine
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/// instructions.
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FunctionPass *createMachineCSEPass();
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/// createMachineLICMPass - This pass performs LICM on machine instructions.
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///
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FunctionPass *createMachineLICMPass(bool PreRegAlloc = true);
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/// createMachineSinkingPass - This pass performs sinking on machine
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/// instructions.
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FunctionPass *createMachineSinkingPass();
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/// createPeepholeOptimizerPass - This pass performs peephole optimizations -
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/// like extension and comparison eliminations.
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FunctionPass *createPeepholeOptimizerPass();
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/// createOptimizePHIsPass - This pass optimizes machine instruction PHIs
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/// to take advantage of opportunities created during DAG legalization.
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FunctionPass *createOptimizePHIsPass();
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/// createStackSlotColoringPass - This pass performs stack slot coloring.
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FunctionPass *createStackSlotColoringPass(bool);
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/// createStackProtectorPass - This pass adds stack protectors to functions.
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FunctionPass *createStackProtectorPass(const TargetLowering *tli);
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/// createMachineVerifierPass - This pass verifies cenerated machine code
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/// instructions for correctness.
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FunctionPass *createMachineVerifierPass(const char *Banner = 0);
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/// createDwarfEHPass - This pass mulches exception handling code into a form
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/// adapted to code generation. Required if using dwarf exception handling.
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FunctionPass *createDwarfEHPass(const TargetMachine *tm);
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/// createSjLjEHPass - This pass adapts exception handling code to use
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/// the GCC-style builtin setjmp/longjmp (sjlj) to handling EH control flow.
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FunctionPass *createSjLjEHPass(const TargetLowering *tli);
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/// createLocalStackSlotAllocationPass - This pass assigns local frame
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/// indices to stack slots relative to one another and allocates
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/// base registers to access them when it is estimated by the target to
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/// be out of range of normal frame pointer or stack pointer index
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/// addressing.
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FunctionPass *createLocalStackSlotAllocationPass();
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/// createExpandISelPseudosPass - This pass expands pseudo-instructions.
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///
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FunctionPass *createExpandISelPseudosPass();
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} // End llvm namespace
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#endif
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