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Enable stack coloring by default.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52057 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-06-06 19:52:44 +00:00
parent 6b4a65f4e7
commit 877333b99d
2 changed files with 11 additions and 8 deletions
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10
lib/CodeGen/LLVMTargetMachine.cpp
View File

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

9
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 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 effects). Once this is in place, it would be even better to have tblgen
synthesize the various copy insertion/inspection methods in TargetInstrInfo. 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