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Add a debugging option for SSC DCE. 

llvm-svn: 65375
This commit is contained in:
Owen Anderson 2009-02-24 05:44:18 +00:00
parent 59da739613
commit 0fb12efbc1
1 changed files with 5 additions and 0 deletions
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5
llvm/lib/CodeGen/StackSlotColoring.cpp
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@ -37,6 +37,8 @@ EnableDCE("enable-ssc-dce",
cl::init(false), cl::Hidden,
cl::desc("Enable slot coloring DCE"));
static cl::opt<int> DCELimit("ssc-dce-limit", cl::init(-1), cl::Hidden);
STATISTIC(NumEliminated, "Number of stack slots eliminated due to coloring");
STATISTIC(NumDeadAccesses,
"Number of trivially dead stack accesses eliminated");
@ -286,6 +288,9 @@ bool StackSlotColoring::removeDeadStores(MachineBasicBlock* MBB) {
for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
I != E; ++I) {
if (DCELimit != -1 && (int)NumDeadAccesses >= DCELimit)
break;
MachineBasicBlock::iterator NextMI = next(I);
if (NextMI == MBB->end()) continue;