Add command line option to limit the number splits to help debugging.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58312 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/PreAllocSplitting.cpp b/lib/CodeGen/PreAllocSplitting.cpp
index 5c1c223..b6efe06 100644
--- a/lib/CodeGen/PreAllocSplitting.cpp
+++ b/lib/CodeGen/PreAllocSplitting.cpp
@@ -33,7 +33,9 @@
#include <map>
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 {
class VISIBILITY_HIDDEN PreAllocSplitting : public MachineFunctionPass {
@@ -607,7 +609,7 @@
// Record val# values are in the specific spill slot.
RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS);
- ++NumSplit;
+ ++NumSplits;
return true;
}
@@ -659,7 +661,7 @@
// Record val# values are in the specific spill slot.
RecordSplit(CurrLI->reg, SpillIndex, RestoreIndex, SS);
- ++NumSplit;
+ ++NumSplits;
return true;
}
@@ -689,6 +691,8 @@
// Process the affected live intervals.
bool Change = false;
while (!Intervals.empty()) {
+ if (PreSplitLimit != -1 && (int)NumSplits == PreSplitLimit)
+ break;
LiveInterval *LI = Intervals.back();
Intervals.pop_back();
Change |= SplitRegLiveInterval(LI);