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https://github.com/c64scene-ar/llvm-6502.git
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Make the register scavenger update the bookkeeping values for sub/super
registers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47861 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
@@ -25,6 +25,24 @@
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/STLExtras.h"
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using namespace llvm;
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using namespace llvm;
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/// setUsed - Set the register and its sub-registers as being used.
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void RegScavenger::setUsed(unsigned Reg) {
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RegsAvailable.reset(Reg);
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for (const unsigned *SubRegs = RegInfo->getSubRegisters(Reg);
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unsigned SubReg = *SubRegs; ++SubRegs)
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RegsAvailable.reset(SubReg);
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}
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/// setUnused - Set the register and its sub-registers as being unused.
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void RegScavenger::setUnused(unsigned Reg) {
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RegsAvailable.set(Reg);
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for (const unsigned *SubRegs = RegInfo->getSubRegisters(Reg);
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unsigned SubReg = *SubRegs; ++SubRegs)
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RegsAvailable.set(SubReg);
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}
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void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
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void RegScavenger::enterBasicBlock(MachineBasicBlock *mbb) {
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const MachineFunction &MF = *mbb->getParent();
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const MachineFunction &MF = *mbb->getParent();
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const TargetMachine &TM = MF.getTarget();
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const TargetMachine &TM = MF.getTarget();
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@@ -105,9 +123,10 @@ void RegScavenger::forward() {
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const MachineOperand &MO = MI->getOperand(i);
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const MachineOperand &MO = MI->getOperand(i);
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if (!MO.isRegister() || !MO.isUse())
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if (!MO.isRegister() || !MO.isUse())
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continue;
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continue;
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unsigned Reg = MO.getReg();
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unsigned Reg = MO.getReg();
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if (Reg == 0)
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if (Reg == 0) continue;
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continue;
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if (!isUsed(Reg)) {
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if (!isUsed(Reg)) {
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// Register has been scavenged. Restore it!
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// Register has been scavenged. Restore it!
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if (Reg != ScavengedReg)
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if (Reg != ScavengedReg)
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@@ -115,9 +134,16 @@ void RegScavenger::forward() {
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else
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else
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restoreScavengedReg();
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restoreScavengedReg();
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}
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}
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if (MO.isKill() && !isReserved(Reg))
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if (MO.isKill() && !isReserved(Reg)) {
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ChangedRegs.set(Reg);
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ChangedRegs.set(Reg);
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for (const unsigned *SubRegs = RegInfo->getSubRegisters(Reg);
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unsigned SubReg = *SubRegs; ++SubRegs)
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ChangedRegs.set(SubReg);
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}
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}
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}
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// Change states of all registers after all the uses are processed to guard
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// Change states of all registers after all the uses are processed to guard
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// against multiple uses.
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// against multiple uses.
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setUnused(ChangedRegs);
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setUnused(ChangedRegs);
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@@ -125,19 +151,24 @@ void RegScavenger::forward() {
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// Process defs.
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// Process defs.
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
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const MachineOperand &MO = MI->getOperand(i);
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const MachineOperand &MO = MI->getOperand(i);
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if (!MO.isRegister() || !MO.isDef())
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if (!MO.isRegister() || !MO.isDef())
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continue;
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continue;
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unsigned Reg = MO.getReg();
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unsigned Reg = MO.getReg();
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// If it's dead upon def, then it is now free.
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// If it's dead upon def, then it is now free.
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if (MO.isDead()) {
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if (MO.isDead()) {
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setUnused(Reg);
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setUnused(Reg);
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continue;
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continue;
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}
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}
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// Skip two-address destination operand.
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// Skip two-address destination operand.
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if (TID.findTiedToSrcOperand(i) != -1) {
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if (TID.findTiedToSrcOperand(i) != -1) {
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assert(isUsed(Reg) && "Using an undefined register!");
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assert(isUsed(Reg) && "Using an undefined register!");
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continue;
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continue;
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}
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}
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assert((isUnused(Reg) || isReserved(Reg)) &&
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assert((isUnused(Reg) || isReserved(Reg)) &&
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"Re-defining a live register!");
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"Re-defining a live register!");
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setUsed(Reg);
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setUsed(Reg);
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@@ -177,6 +208,11 @@ void RegScavenger::backward() {
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continue;
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continue;
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assert(isUnused(Reg) || isReserved(Reg));
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assert(isUnused(Reg) || isReserved(Reg));
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ChangedRegs.set(Reg);
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ChangedRegs.set(Reg);
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// Set the sub-registers as "used".
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for (const unsigned *SubRegs = RegInfo->getSubRegisters(Reg);
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unsigned SubReg = *SubRegs; ++SubRegs)
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ChangedRegs.set(SubReg);
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}
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}
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setUsed(ChangedRegs);
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setUsed(ChangedRegs);
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}
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}
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