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Enable stack coloring by default. 

llvm-svn: 52057
This commit is contained in:
Evan Cheng 2008-06-06 19:52:44 +00:00
parent 9bf9110d93
commit c324be32c4
2 changed files with 11 additions and 8 deletions
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10
llvm/lib/CodeGen/LLVMTargetMachine.cpp
View File

@ -38,10 +38,6 @@ static cl::opt<bool>
EnableSinking("enable-sinking", cl::init(false), cl::Hidden,
cl::desc("Perform sinking on machine code"));
static cl::opt<bool>
EnableStackColoring("stack-coloring",
cl::init(false), cl::Hidden,
cl::desc("Perform stack slot coloring"));
static cl::opt<bool>
EnableLICM("machine-licm",
cl::init(false), cl::Hidden,
cl::desc("Perform loop-invariant code motion on machine code"));
@ -103,8 +99,7 @@ LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM,
PM.add(createRegisterAllocator());
// Perform stack slot coloring.
if (EnableStackColoring)
PM.add(createStackSlotColoringPass());
PM.add(createStackSlotColoringPass());
if (PrintMachineCode) // Print the register-allocated code
PM.add(createMachineFunctionPrinterPass(cerr));
@ -240,8 +235,7 @@ bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM,
PM.add(createRegisterAllocator());
// Perform stack slot coloring.
if (EnableStackColoring)
PM.add(createStackSlotColoringPass());
PM.add(createStackSlotColoringPass());
if (PrintMachineCode)
PM.add(createMachineFunctionPrinterPass(cerr));

9
llvm/lib/CodeGen/README.txt
View File

@ -197,3 +197,12 @@ It would be really nice to be able to write patterns in .td files for copies,
which would eliminate a bunch of explicit predicates on them (e.g. no side
effects). Once this is in place, it would be even better to have tblgen
synthesize the various copy insertion/inspection methods in TargetInstrInfo.
//===---------------------------------------------------------------------===//
Stack coloring improvments:
1. Do proper LiveStackAnalysis on all stack objects including those which are
not spill slots.
2. Reorder objects to fill in gaps between objects.
e.g. 4, 1, <gap>, 4, 1, 1, 1, <gap>, 4 => 4, 1, 1, 1, 1, 4, 4