maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Do not substitute if the new register isn't in the register class of the operand being updated. 

llvm-svn: 70953
This commit is contained in:
Evan Cheng 2009-05-05 00:46:16 +00:00
parent 94c464ef22
commit 6fc03634db
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
llvm/lib/CodeGen/StackSlotColoring.cpp
View File

@ -477,6 +477,7 @@ bool StackSlotColoring::PropagateBackward(MachineBasicBlock::iterator MII,
bool FoundDef = false; // Not counting 2address def.
bool FoundUse = false;
bool FoundKill = false;
const TargetInstrDesc &TID = MII->getDesc();
for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MII->getOperand(i);
if (!MO.isReg())
@ -485,6 +486,10 @@ bool StackSlotColoring::PropagateBackward(MachineBasicBlock::iterator MII,
if (Reg == 0)
continue;
if (Reg == OldReg) {
const TargetRegisterClass *RC = getInstrOperandRegClass(TRI, TID, i);
if (RC && !RC->contains(NewReg))
return false;
if (MO.isUse()) {
FoundUse = true;
if (MO.isKill())
@ -521,6 +526,7 @@ bool StackSlotColoring::PropagateForward(MachineBasicBlock::iterator MII,
while (++MII != MBB->end()) {
bool FoundUse = false;
bool FoundKill = false;
const TargetInstrDesc &TID = MII->getDesc();
for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MII->getOperand(i);
if (!MO.isReg())
@ -531,6 +537,10 @@ bool StackSlotColoring::PropagateForward(MachineBasicBlock::iterator MII,
if (Reg == OldReg) {
if (MO.isDef())
return false;
const TargetRegisterClass *RC = getInstrOperandRegClass(TRI, TID, i);
if (RC && !RC->contains(NewReg))
return false;
FoundUse = true;
if (MO.isKill())
FoundKill = true;
@ -558,6 +568,8 @@ void StackSlotColoring::UnfoldAndRewriteInstruction(MachineInstr *MI, int OldFI,
MachineBasicBlock *MBB = MI->getParent();
if (unsigned DstReg = TII->isLoadFromStackSlot(MI, OldFI)) {
if (PropagateForward(MI, MBB, DstReg, Reg)) {
DOUT << "Eliminated load: ";
DEBUG(MI->dump());
++NumLoadElim;
} else {
TII->copyRegToReg(*MBB, MI, DstReg, Reg, RC, RC);
@ -565,6 +577,8 @@ void StackSlotColoring::UnfoldAndRewriteInstruction(MachineInstr *MI, int OldFI,
}
} else if (unsigned SrcReg = TII->isStoreToStackSlot(MI, OldFI)) {
if (MI->killsRegister(SrcReg) && PropagateBackward(MI, MBB, SrcReg, Reg)) {
DOUT << "Eliminated store: ";
DEBUG(MI->dump());
++NumStoreElim;
} else {
TII->copyRegToReg(*MBB, MI, Reg, SrcReg, RC, RC);