[llvm-commits] CVS: llvm/lib/Target/TargetMachine.cpp
vadve at cs.uiuc.edu
vadve at cs.uiuc.edu
Mon Sep 16 10:47:03 PDT 2002
Changes in directory llvm/lib/Target:
TargetMachine.cpp updated: 1.7 -> 1.8
---
Log message:
Move all the code that creates code generation passes from Sparc.cpp to
TargetMachine.cpp, since it is entirely machine-independent.
Also, add options to disable optional back-end passes (preselection and
instr. scheduling).
---
Diffs of the changes:
Index: llvm/lib/Target/TargetMachine.cpp
diff -u llvm/lib/Target/TargetMachine.cpp:1.7 llvm/lib/Target/TargetMachine.cpp:1.8
--- llvm/lib/Target/TargetMachine.cpp:1.7 Thu Nov 8 20:20:18 2001
+++ llvm/lib/Target/TargetMachine.cpp Mon Sep 16 10:39:03 2002
@@ -8,9 +8,31 @@
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/MachineInstrInfo.h"
#include "llvm/Target/MachineCacheInfo.h"
+#include "llvm/CodeGen/PreSelection.h"
+#include "llvm/CodeGen/InstrSelection.h"
+#include "llvm/CodeGen/InstrScheduling.h"
+#include "llvm/CodeGen/RegisterAllocation.h"
+#include "llvm/CodeGen/MachineCodeForMethod.h"
+#include "llvm/CodeGen/MachineCodeForInstruction.h"
+#include "llvm/Reoptimizer/Mapping/MappingInfo.h"
+#include "llvm/Reoptimizer/Mapping/FInfo.h"
+#include "llvm/Transforms/Scalar.h"
+#include "Support/CommandLine.h"
+#include "llvm/PassManager.h"
+#include "llvm/Function.h"
#include "llvm/DerivedTypes.h"
//---------------------------------------------------------------------------
+// Command line options to control choice of code generation passes.
+//---------------------------------------------------------------------------
+
+static cl::opt<bool> DisablePreSelect("nopreselect",
+ cl::desc("Disable preselection pass"));
+
+static cl::opt<bool> DisableSched("nosched",
+ cl::desc("Disable local scheduling pass"));
+
+//---------------------------------------------------------------------------
// class TargetMachine
//
// Purpose:
@@ -44,6 +66,99 @@
}
+//===---------------------------------------------------------------------===//
+// Default code generation passes.
+//
+// Native code generation for a specified target.
+//===---------------------------------------------------------------------===//
+
+class ConstructMachineCodeForFunction : public FunctionPass {
+ TargetMachine &Target;
+public:
+ inline ConstructMachineCodeForFunction(TargetMachine &T) : Target(T) {}
+
+ const char *getPassName() const {
+ return "ConstructMachineCodeForFunction";
+ }
+
+ bool runOnFunction(Function &F) {
+ MachineCodeForMethod::construct(&F, Target);
+ return false;
+ }
+};
+
+struct FreeMachineCodeForFunction : public FunctionPass {
+ const char *getPassName() const { return "FreeMachineCodeForFunction"; }
+
+ static void freeMachineCode(Instruction &I) {
+ MachineCodeForInstruction::destroy(&I);
+ }
+
+ bool runOnFunction(Function &F) {
+ for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
+ for (BasicBlock::iterator I = FI->begin(), E = FI->end(); I != E; ++I)
+ MachineCodeForInstruction::get(I).dropAllReferences();
+
+ for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
+ for_each(FI->begin(), FI->end(), freeMachineCode);
+
+ return false;
+ }
+};
+
+// addPassesToEmitAssembly - This method controls the entire code generation
+// process for the ultra sparc.
+//
+void
+TargetMachine::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out)
+{
+ // Construct and initialize the MachineCodeForMethod object for this fn.
+ PM.add(new ConstructMachineCodeForFunction(*this));
+
+ // Specialize LLVM code for this target machine and then
+ // run basic dataflow optimizations on LLVM code.
+ if (!DisablePreSelect)
+ {
+ PM.add(createPreSelectionPass(*this));
+ PM.add(createReassociatePass());
+ PM.add(createGCSEPass());
+ PM.add(createLICMPass());
+ }
+
+ PM.add(createInstructionSelectionPass(*this));
+
+ if (!DisableSched)
+ PM.add(createInstructionSchedulingWithSSAPass(*this));
+
+ PM.add(getRegisterAllocator(*this));
+
+ //PM.add(new OptimizeLeafProcedures());
+ //PM.add(new DeleteFallThroughBranches());
+ //PM.add(new RemoveChainedBranches()); // should be folded with previous
+ //PM.add(new RemoveRedundantOps()); // operations with %g0, NOP, etc.
+
+ PM.add(getPrologEpilogInsertionPass());
+
+ PM.add(MappingInfoForFunction(Out));
+
+ // Output assembly language to the .s file. Assembly emission is split into
+ // two parts: Function output and Global value output. This is because
+ // function output is pipelined with all of the rest of code generation stuff,
+ // allowing machine code representations for functions to be free'd after the
+ // function has been emitted.
+ //
+ PM.add(getFunctionAsmPrinterPass(Out));
+ PM.add(new FreeMachineCodeForFunction()); // Free stuff no longer needed
+
+ // Emit Module level assembly after all of the functions have been processed.
+ PM.add(getModuleAsmPrinterPass(Out));
+
+ // Emit bytecode to the assembly file into its special section next
+ PM.add(getEmitBytecodeToAsmPass(Out));
+ PM.add(getFunctionInfo(Out));
+}
+
+
//---------------------------------------------------------------------------
// class MachineInstructionInfo
// Interface to description of machine instructions
@@ -79,6 +194,10 @@
uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended);
if (maxImmedValue != 0)
{
+ // NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
+ // SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
+ // See CreateUIntSetInstruction in SparcInstrInfo.cpp.
+
// Now check if the constant fits
if (intValue <= (int64_t) maxImmedValue &&
intValue >= -((int64_t) maxImmedValue+1))
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