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Simplify the code that adds passes so compilation can stop after any step
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2775 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,17 +15,69 @@
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#include "llvm/Transforms/ConstantMerge.h"
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#include "llvm/Transforms/ChangeAllocations.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Bytecode/WriteBytecodePass.h"
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#include "Support/CommandLine.h"
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#include "Support/Signals.h"
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#include <memory>
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#include <fstream>
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cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
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cl::Required, "");
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cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
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cl::Flag StopAtLevelRaise("stopraise", "Stop optimization before level raise",
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cl::Hidden);
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static cl::String InputFilename ("", "Parse <arg> file, compile to bytecode",
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cl::Required, "");
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static cl::String OutputFilename ("o", "Override output filename");
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static cl::Int RunNPasses ("stopAfterNPasses", "Only run the first N "
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"passes of gccas", cl::Hidden);
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static cl::Flag StopAtLevelRaise("stopraise", "Stop optimization before "
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"level raise", cl::Hidden);
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static cl::Flag Verify ("verify", "Verify each pass result");
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static inline void addPass(PassManager &PM, Pass *P) {
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static int NumPassesCreated = 0;
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// If we haven't already created the number of passes that was requested...
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if (RunNPasses == 0 || RunNPasses > NumPassesCreated) {
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// Add the pass to the pass manager...
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PM.add(P);
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// If we are verifying all of the intermediate steps, add the verifier...
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if (Verify) PM.add(createVerifierPass());
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// Keep track of how many passes we made for -stopAfterNPasses
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++NumPassesCreated;
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}
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}
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void AddConfiguredTransformationPasses(PassManager &PM) {
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if (Verify) PM.add(createVerifierPass());
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addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
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addPass(PM, createConstantMergePass()); // Merge dup global constants
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addPass(PM, createDeadInstEliminationPass()); // Remove Dead code/vars
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addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
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addPass(PM, createCleanupGCCOutputPass()); // Fix gccisms
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addPass(PM, createIndVarSimplifyPass()); // Simplify indvars
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// Level raise is eternally buggy/in need of enhancements. Allow
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// transformation to stop right before it runs.
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if (StopAtLevelRaise) return;
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addPass(PM, createRaisePointerReferencesPass());// Eliminate casts
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addPass(PM, createPromoteMemoryToRegister()); // Promote alloca's to regs
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addPass(PM, createReassociatePass()); // Reassociate expressions
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addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
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addPass(PM, createDeadInstEliminationPass()); // Kill InstCombine remnants
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addPass(PM, createLICMPass()); // Hoist loop invariants
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addPass(PM, createGCSEPass()); // Remove common subexprs
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addPass(PM, createSCCPPass()); // Constant prop with SCCP
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// Run instcombine after redundancy elimination to exploit opportunities
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// opened up by them.
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addPass(PM, createInstructionCombiningPass());
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addPass(PM, createAggressiveDCEPass()); // SSA based 'Agressive DCE'
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addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
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}
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
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@ -68,31 +120,16 @@ int main(int argc, char **argv) {
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// a little bit. Do this now.
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//
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PassManager Passes;
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Passes.add(createFunctionResolvingPass()); // Resolve (...) functions
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Passes.add(createConstantMergePass()); // Merge dup global constants
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Passes.add(createDeadInstEliminationPass()); // Remove Dead code/vars
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Passes.add(createRaiseAllocationsPass()); // call %malloc -> malloc inst
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Passes.add(createCleanupGCCOutputPass()); // Fix gccisms
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Passes.add(createIndVarSimplifyPass()); // Simplify indvars
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if (!StopAtLevelRaise) {
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Passes.add(createRaisePointerReferencesPass()); // Eliminate casts
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Passes.add(createPromoteMemoryToRegister()); // Promote alloca's to regs
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Passes.add(createReassociatePass()); // Reassociate expressions
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Passes.add(createInstructionCombiningPass()); // Combine silly seq's
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Passes.add(createDeadInstEliminationPass()); // Kill InstCombine remnants
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Passes.add(createLICMPass()); // Hoist loop invariants
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Passes.add(createGCSEPass()); // Remove common subexprs
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Passes.add(createSCCPPass()); // Constant prop with SCCP
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// Run instcombine after redundancy elimination to exploit opportunities
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// opened up by them.
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Passes.add(createInstructionCombiningPass());
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Passes.add(createAggressiveDCEPass()); // SSA based 'Agressive DCE'
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Passes.add(createCFGSimplificationPass()); // Merge & remove BBs
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}
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Passes.add(new WriteBytecodePass(&Out)); // Write bytecode to file...
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// Add all of the transformation passes to the pass manager to do the cleanup
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// and optimization of the GCC output.
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//
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AddConfiguredTransformationPasses(Passes);
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// Write bytecode to file...
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Passes.add(new WriteBytecodePass(&Out));
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// Run our queue of passes all at once now, efficiently.
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Passes.run(M.get());
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Passes.run(*M.get());
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return 0;
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}
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