[PATCH] compile time improvement for MachineSink
Phabricator
reviews at reviews.llvm.org
Fri May 15 20:14:58 PDT 2015
REPOSITORY
rL LLVM
http://reviews.llvm.org/D9719
Files:
llvm/trunk/lib/CodeGen/MachineSink.cpp
Index: llvm/trunk/lib/CodeGen/MachineSink.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/MachineSink.cpp
+++ llvm/trunk/lib/CodeGen/MachineSink.cpp
@@ -19,6 +19,7 @@
#include "llvm/CodeGen/Passes.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallSet.h"
+#include "llvm/ADT/SparseBitVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
@@ -70,6 +71,8 @@
// will be split.
SetVector<std::pair<MachineBasicBlock*,MachineBasicBlock*> > ToSplit;
+ SparseBitVector<> RegsToClearKillFlags;
+
public:
static char ID; // Pass identification
MachineSinking() : MachineFunctionPass(ID) {
@@ -287,6 +290,12 @@
if (!MadeChange) break;
EverMadeChange = true;
}
+
+ // Now clear any kill flags for recorded registers.
+ for (auto I : RegsToClearKillFlags)
+ MRI->clearKillFlags(I);
+ RegsToClearKillFlags.clear();
+
return EverMadeChange;
}
@@ -761,7 +770,7 @@
// used registers.
for (MachineOperand &MO : MI->operands()) {
if (MO.isReg() && MO.isUse())
- MRI->clearKillFlags(MO.getReg());
+ RegsToClearKillFlags.set(MO.getReg()); // Remember to clear kill flags.
}
return true;
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