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Use a SmallSet when we can to reduce memory allocations.
This speeds up a particular testcase from 0.0302s to 0.0222s in LiveVariables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52819 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -34,6 +34,7 @@
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/DepthFirstIterator.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Config/alloca.h"
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#include "llvm/Config/alloca.h"
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#include <algorithm>
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#include <algorithm>
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@ -387,7 +388,7 @@ bool LiveVariables::HandlePhysRegKill(unsigned Reg) {
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void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
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void LiveVariables::HandlePhysRegDef(unsigned Reg, MachineInstr *MI) {
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// What parts of the register are previously defined?
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// What parts of the register are previously defined?
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std::set<unsigned> Live;
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SmallSet<unsigned, 32> Live;
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if (PhysRegDef[Reg] || PhysRegUse[Reg]) {
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if (PhysRegDef[Reg] || PhysRegUse[Reg]) {
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Live.insert(Reg);
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Live.insert(Reg);
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for (const unsigned *SS = TRI->getSubRegisters(Reg); *SS; ++SS)
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for (const unsigned *SS = TRI->getSubRegisters(Reg); *SS; ++SS)
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