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Simplify/speedup the PEI by not having to scan for uses of the callee saved
registers. This information is computed directly by the register allocator now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19795 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -111,8 +111,6 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
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FrameSetupOpcode == -1 && FrameDestroyOpcode == -1)
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FrameSetupOpcode == -1 && FrameDestroyOpcode == -1)
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return;
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return;
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// This bitset contains an entry for each physical register for the target...
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std::vector<char> ModifiedRegs(RegInfo->getNumRegs());
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unsigned MaxCallFrameSize = 0;
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unsigned MaxCallFrameSize = 0;
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bool HasCalls = false;
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bool HasCalls = false;
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@ -127,19 +125,6 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
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HasCalls = true;
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HasCalls = true;
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RegInfo->eliminateCallFramePseudoInstr(Fn, *BB, I++);
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RegInfo->eliminateCallFramePseudoInstr(Fn, *BB, I++);
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} else {
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} else {
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = I->getOperand(i);
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if (MO.isRegister() && MO.isDef()) {
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assert(MRegisterInfo::isPhysicalRegister(MO.getReg()) &&
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"Register allocation must be performed!");
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ModifiedRegs[MO.getReg()] = true; // Register is modified
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}
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// Mark any implicitly defined registers as being modified.
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for (const unsigned *ImpDefs = TII.getImplicitDefs(I->getOpcode());
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*ImpDefs; ++ImpDefs)
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ModifiedRegs[*ImpDefs] = true;
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}
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++I;
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++I;
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}
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}
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@ -150,14 +135,15 @@ void PEI::calculateCallerSavedRegisters(MachineFunction &Fn) {
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// Now figure out which *callee saved* registers are modified by the current
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// Now figure out which *callee saved* registers are modified by the current
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// function, thus needing to be saved and restored in the prolog/epilog.
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// function, thus needing to be saved and restored in the prolog/epilog.
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//
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//
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const bool *PhysRegsUsed = Fn.getUsedPhysregs();
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for (unsigned i = 0; CSRegs[i]; ++i) {
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for (unsigned i = 0; CSRegs[i]; ++i) {
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unsigned Reg = CSRegs[i];
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unsigned Reg = CSRegs[i];
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if (ModifiedRegs[Reg]) {
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if (PhysRegsUsed[Reg]) {
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RegsToSave.push_back(Reg); // If modified register...
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RegsToSave.push_back(Reg); // If the reg is modified, save it!
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} else {
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} else {
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for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
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for (const unsigned *AliasSet = RegInfo->getAliasSet(Reg);
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*AliasSet; ++AliasSet) { // Check alias registers too...
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*AliasSet; ++AliasSet) { // Check alias registers too.
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if (ModifiedRegs[*AliasSet]) {
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if (PhysRegsUsed[*AliasSet]) {
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RegsToSave.push_back(Reg);
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RegsToSave.push_back(Reg);
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break;
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break;
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}
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}
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