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Actually insert copies now!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-01-08 05:16:15 +00:00
parent 4a6a6f21f3
commit 0d893b4038
1 changed files with 29 additions and 6 deletions
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35
lib/CodeGen/StrongPHIElimination.cpp
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@ -25,6 +25,7 @@
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/ADT/DepthFirstIterator.h"
@ -47,11 +48,8 @@ namespace {
bool runOnMachineFunction(MachineFunction &Fn);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<LiveVariables>();
AU.addPreservedID(PHIEliminationID);
AU.addRequired<MachineDominatorTree>();
AU.addRequired<LiveVariables>();
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
@ -516,6 +514,7 @@ void StrongPHIElimination::processPHIUnion(MachineInstr* Inst,
/// of Static Single Assignment Form" by Briggs, et al.
void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
std::set<unsigned>& pushed) {
// FIXME: This function needs to update LiveVariables
std::map<unsigned, unsigned>& copy_set= Waiting[MBB];
std::map<unsigned, unsigned> worklist;
@ -540,6 +539,8 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
}
LiveVariables& LV = getAnalysis<LiveVariables>();
MachineFunction* MF = MBB->getParent();
const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
// Iterate over the worklist, inserting copies
while (!worklist.empty() || !copy_set.empty()) {
@ -547,13 +548,29 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
std::pair<unsigned, unsigned> curr = *worklist.begin();
worklist.erase(curr.first);
const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(curr.first);
if (isLiveOut(LV.getVarInfo(curr.second), MBB)) {
// Insert copy from curr.second to a temporary
// Create a temporary
unsigned t = MF->getRegInfo().createVirtualRegister(RC);
// Insert copy from curr.second to a temporary at
// the Phi defining curr.second
LiveVariables::VarInfo VI = LV.getVarInfo(curr.second);
MachineBasicBlock::iterator PI = VI.DefInst;
TII->copyRegToReg(*VI.DefInst->getParent(), PI, t,
curr.second, RC, RC);
// Push temporary on Stacks
// Insert temporary in pushed
Stacks[curr.second].push_back(t);
// Insert curr.second in pushed
pushed.insert(curr.second);
}
// Insert copy from map[curr.first] to curr.second
TII->copyRegToReg(*MBB, MBB->end(), curr.second,
map[curr.first], RC, RC);
map[curr.first] = curr.second;
// If curr.first is a destination in copy_set...
@ -577,8 +594,13 @@ void StrongPHIElimination::ScheduleCopies(MachineBasicBlock* MBB,
std::pair<unsigned, unsigned> curr = *copy_set.begin();
copy_set.erase(curr.first);
const TargetRegisterClass *RC = MF->getRegInfo().getRegClass(curr.first);
// Insert a copy from dest to a new temporary t at the end of b
// map[curr.second] = t;
unsigned t = MF->getRegInfo().createVirtualRegister(RC);
TII->copyRegToReg(*MBB, MBB->end(), t,
curr.second, RC, RC);
map[curr.second] = t;
worklist.insert(curr);
}
@ -628,6 +650,7 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
InsertCopies(Fn.begin());
// FIXME: Perform renaming
// FIXME: Remove Phi instrs
return false;
}