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Modify local register allocator to use the two-address instruction pass.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10513 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2003-12-18 13:08:52 +00:00
parent 71499ded4d
commit 9af9dbde7d
1 changed files with 5 additions and 18 deletions
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23
lib/CodeGen/RegAllocLocal.cpp
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@ -19,6 +19,7 @@
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/TwoAddressInstructionPass.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "Support/CommandLine.h"
@ -112,6 +113,7 @@ namespace {
if (!DisableKill)
AU.addRequired<LiveVariables>();
AU.addRequiredID(PHIEliminationID);
AU.addRequired<TwoAddressInstructionPass>();
MachineFunctionPass::getAnalysisUsage(AU);
}
@ -571,28 +573,13 @@ void RA::AllocateBasicBlock(MachineBasicBlock &MBB) {
unsigned DestVirtReg = MI->getOperand(i).getAllocatedRegNum();
unsigned DestPhysReg;
// If DestVirtReg already has a value, forget about it. Why doesn't
// getReg do this right?
// If DestVirtReg already has a value, use it.
std::map<unsigned, unsigned>::iterator DestI =
Virt2PhysRegMap.find(DestVirtReg);
if (DestI != Virt2PhysRegMap.end()) {
unsigned PhysReg = DestI->second;
Virt2PhysRegMap.erase(DestI);
removePhysReg(PhysReg);
DestPhysReg = DestI->second;
}
if (TM->getInstrInfo().isTwoAddrInstr(MI->getOpcode()) && i == 0) {
// must be same register number as the first operand
// This maps a = b + c into b += c, and saves b into a's spot
assert(MI->getOperand(1).isPhysicalRegister() &&
MI->getOperand(1).getAllocatedRegNum() &&
MI->getOperand(1).isUse() &&
"Two address instruction invalid!");
DestPhysReg = MI->getOperand(1).getAllocatedRegNum();
liberatePhysReg(MBB, I, DestPhysReg);
assignVirtToPhysReg(DestVirtReg, DestPhysReg);
} else {
else {
DestPhysReg = getReg(MBB, I, DestVirtReg);
}
markVirtRegModified(DestVirtReg);