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PreSelection is not optional, it performs a necessary and vital transformation 

for the Sparc backend: breaking up constant expressions. Thus, we cannot have it
guarded by a conditional, it should never be disabled.

Also, it's now available for the JIT since it is a FunctionPass.

llvm-svn: 9791
This commit is contained in:
Misha Brukman 2003-11-07 20:33:25 +00:00
parent d7bcd99325
commit 3b2343eae9
1 changed files with 15 additions and 12 deletions
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13
llvm/lib/Target/Sparc/Sparc.cpp
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@ -42,9 +42,6 @@ const TargetInstrDescriptor SparcMachineInstrDesc[] = {
// Command line options to control choice of code generation passes. // Command line options to control choice of code generation passes.
//--------------------------------------------------------------------------- //---------------------------------------------------------------------------
static cl::opt<bool> DisablePreOpt("disable-preopt",
cl::desc("Disable optimizations prior to instruction selection"));
static cl::opt<bool> DisableSched("disable-sched", static cl::opt<bool> DisableSched("disable-sched",
cl::desc("Disable local scheduling pass")); cl::desc("Disable local scheduling pass"));
@ -178,14 +175,12 @@ bool UltraSparc::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out)
//so %fp+offset-8 and %fp+offset-16 are empty slots now! //so %fp+offset-8 and %fp+offset-16 are empty slots now!
PM.add(createStackSlotsPass(*this)); PM.add(createStackSlotsPass(*this));
if (!DisablePreOpt) {
// Specialize LLVM code for this target machine // Specialize LLVM code for this target machine
PM.add(createPreSelectionPass(*this)); PM.add(createPreSelectionPass(*this));
// Run basic dataflow optimizations on LLVM code // Run basic dataflow optimizations on LLVM code
PM.add(createReassociatePass()); PM.add(createReassociatePass());
PM.add(createLICMPass()); PM.add(createLICMPass());
PM.add(createGCSEPass()); PM.add(createGCSEPass());
}
// If LLVM dumping after transformations is requested, add it to the pipeline // If LLVM dumping after transformations is requested, add it to the pipeline
if (DumpInput) if (DumpInput)
@ -252,6 +247,14 @@ bool UltraSparc::addPassesToJITCompile(FunctionPassManager &PM) {
// Construct and initialize the MachineFunction object for this fn. // Construct and initialize the MachineFunction object for this fn.
PM.add(createMachineCodeConstructionPass(*this)); PM.add(createMachineCodeConstructionPass(*this));
// Specialize LLVM code for this target machine and then
// run basic dataflow optimizations on LLVM code.
PM.add(createPreSelectionPass(*this));
// Run basic dataflow optimizations on LLVM code
PM.add(createReassociatePass());
PM.add(createLICMPass());
PM.add(createGCSEPass());
PM.add(createInstructionSelectionPass(*this)); PM.add(createInstructionSelectionPass(*this));
PM.add(getRegisterAllocator(*this)); PM.add(getRegisterAllocator(*this));