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Only safe to use a call-clobbered or spilled callee-saved register as scratch register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35010 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,6 +15,7 @@
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#define DEBUG_TYPE "arm-ldst-opt"
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#include "ARM.h"
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#include "ARMAddressingModes.h"
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#include "ARMMachineFunctionInfo.h"
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#include "ARMRegisterInfo.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.h"
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@ -39,6 +40,7 @@ namespace {
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struct VISIBILITY_HIDDEN ARMLoadStoreOpt : public MachineFunctionPass {
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const TargetInstrInfo *TII;
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const MRegisterInfo *MRI;
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ARMFunctionInfo *AFI;
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RegScavenger *RS;
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MachineBasicBlock::iterator RSI;
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@ -587,8 +589,11 @@ bool ARMLoadStoreOpt::LoadStoreMultipleOpti(MachineBasicBlock &MBB) {
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// First advance to the instruction just before the start of the chain.
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if (RSI != MBB.begin())
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RS->forward(prior(RSI));
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// Find a scratch register.
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Scratch = RS->FindUnusedReg(&ARM::GPRRegClass);
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// Find a scratch register. Make sure it's a call clobbered register or
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// a spilled callee-saved register.
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Scratch = RS->FindUnusedReg(&ARM::GPRRegClass, true);
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if (!Scratch)
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RS->FindUnusedReg(&ARM::GPRRegClass, AFI->getSpilledCSRegisters());
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// Process the load / store instructions.
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RS->forward(prior(MBBI));
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@ -661,6 +666,7 @@ bool ARMLoadStoreOpt::MergeReturnIntoLDM(MachineBasicBlock &MBB) {
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bool ARMLoadStoreOpt::runOnMachineFunction(MachineFunction &Fn) {
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const TargetMachine &TM = Fn.getTarget();
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AFI = Fn.getInfo<ARMFunctionInfo>();
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TII = TM.getInstrInfo();
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MRI = TM.getRegisterInfo();
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RS = new RegScavenger();
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