+//===-- gccas.cpp - The "optimizing assembler" used by the GCC frontend ---===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
-// LLVM 'GCCAS' UTILITY
//
// This utility is designed to be used by the GCC frontend for creating bytecode
// files from its intermediate LLVM assembly. The requirements for this utility
#include "llvm/Target/TargetData.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/Scalar.h"
-#include "Support/CommandLine.h"
-#include "Support/Signals.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/System/Signals.h"
#include <memory>
#include <fstream>
+using namespace llvm;
+
namespace {
cl::opt<std::string>
InputFilename(cl::Positional,cl::desc("<input llvm assembly>"),cl::init("-"));
cl::opt<bool>
DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
+
+ cl::opt<bool>
+ DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
+
+ cl::opt<bool>
+ DisableDSE("disable-dse", cl::desc("Do not run dead store elimination"));
+ cl::opt<bool>
+ NoCompress("disable-compression", cl::init(false),
+ cl::desc("Don't ompress the generated bytecode"));
}
PM.add(createVerifierPass()); // Verify that input is correct
addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
addPass(PM, createFunctionResolvingPass()); // Resolve (...) functions
+
+ if (DisableOptimizations) return;
+
addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
- addPass(PM, createGlobalDCEPass()); // Remove unused globals
+ addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
+ addPass(PM, createPromoteMemoryToRegister()); // Kill useless allocas
+ addPass(PM, createGlobalOptimizerPass()); // Optimize out global vars
+ addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
+ addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
+ addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
+ addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
+ addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
+
addPass(PM, createPruneEHPass()); // Remove dead EH info
if (!DisableInline)
addPass(PM, createFunctionInliningPass()); // Inline small functions
+ addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
- addPass(PM, createInstructionCombiningPass()); // Cleanup code for raise
addPass(PM, createRaisePointerReferencesPass());// Recover type information
addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
- addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
addPass(PM, createReassociatePass()); // Reassociate expressions
addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+ addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
+ addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
+ addPass(PM, createLoopUnrollPass()); // Unroll small loops
+ addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
addPass(PM, createGCSEPass()); // Remove common subexprs
addPass(PM, createSCCPPass()); // Constant prop with SCCP
// Run instcombine after redundancy elimination to exploit opportunities
// opened up by them.
addPass(PM, createInstructionCombiningPass());
- addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
+ if (!DisableDSE)
+ addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
int main(int argc, char **argv) {
cl::ParseCommandLineOptions(argc, argv, " llvm .s -> .o assembler for GCC\n");
+ sys::PrintStackTraceOnErrorSignal();
std::auto_ptr<Module> M;
try {
// Make sure that the Out file gets unlinked from the disk if we get a
// signal
- RemoveFileOnSignal(OutputFilename);
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
//
AddConfiguredTransformationPasses(Passes);
+ // Make sure everything is still good.
+ Passes.add(createVerifierPass());
+
// Write bytecode to file...
- Passes.add(new WriteBytecodePass(Out));
+ Passes.add(new WriteBytecodePass(Out,false,!NoCompress));
// Run our queue of passes all at once now, efficiently.
Passes.run(*M.get());