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Add command line option to limit the number splits to help debugging.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58312 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-10-28 01:48:24 +00:00
parent 5a9a4bf7f2
commit ae7fa5bef1
1 changed files with 7 additions and 3 deletions
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10
lib/CodeGen/PreAllocSplitting.cpp
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@ -33,7 +33,9 @@
#include <map> #include <map>
using namespace llvm; using namespace llvm;
STATISTIC(NumSplit , "Number of intervals split"); static cl::opt<int> PreSplitLimit("pre-split-limit", cl::init(-1), cl::Hidden);
STATISTIC(NumSplits, "Number of intervals split");
namespace { namespace {
class VISIBILITY_HIDDEN PreAllocSplitting : public MachineFunctionPass { class VISIBILITY_HIDDEN PreAllocSplitting : public MachineFunctionPass {
@ -607,7 +609,7 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
// Record val# values are in the specific spill slot. // Record val# values are in the specific spill slot.
RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS); RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS);
++NumSplit; ++NumSplits;
return true; return true;
} }
@ -659,7 +661,7 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) {
// Record val# values are in the specific spill slot. // Record val# values are in the specific spill slot.
RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS); RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS);
++NumSplit; ++NumSplits;
return true; return true;
} }
@ -689,6 +691,8 @@ PreAllocSplitting::SplitRegLiveIntervals(const TargetRegisterClass **RCs) {
// Process the affected live intervals. // Process the affected live intervals.
bool Change = false; bool Change = false;
while (!Intervals.empty()) { while (!Intervals.empty()) {
if (PreSplitLimit != -1 && (int)NumSplits == PreSplitLimit)
break;
LiveInterval *LI = Intervals.back(); LiveInterval *LI = Intervals.back();
Intervals.pop_back(); Intervals.pop_back();
Change |= SplitRegLiveInterval(LI); Change |= SplitRegLiveInterval(LI);