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Reduce the amount of LLVM Values for which we save reg. allocator

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state. Also, save the state for the incoming register of each phi
node.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13906 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Brian Gaeke 2004-05-30 07:08:43 +00:00
parent a7afac29d0
commit 25d4b54f93
1 changed files with 14 additions and 9 deletions
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23
lib/Target/SparcV9/RegAlloc/PhyRegAlloc.cpp
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@ -28,6 +28,7 @@
#include "../LiveVar/FunctionLiveVarInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/iPHINode.h"
#include "llvm/iOther.h"
#include "llvm/Module.h"
#include "llvm/Type.h"
@ -1164,18 +1165,22 @@ void PhyRegAlloc::saveState () {
saveStateForValue (state, Arg, -1, ArgNum);
++ArgNum;
}
unsigned Insn = 0;
unsigned InstCount = 0;
// Instructions themselves encoded as operand # -1
for (const_inst_iterator II=inst_begin (Fn), IE=inst_end (Fn); II!=IE; ++II){
saveStateForValue (state, (&*II), Insn, -1);
for (unsigned i = 0; i < (*II).getNumOperands (); ++i) {
const Value *V = (*II).getOperand (i);
// Don't worry about it unless it's something whose reg. we'll need.
if (!isa<Argument> (V) && !isa<Instruction> (V))
continue;
saveStateForValue (state, V, Insn, i);
const Instruction *Inst = &*II;
saveStateForValue (state, Inst, InstCount, -1);
if (isa<PHINode> (Inst)) {
MachineCodeForInstruction &MCforPN = MachineCodeForInstruction::get(Inst);
// Last instr should be the copy...figure out what reg it is reading from
if (Value *PhiCpRes = MCforPN.back()->getOperand(0).getVRegValueOrNull()){
if (DEBUG_RA)
std::cerr << "Found Phi copy result: " << PhiCpRes->getName()
<< " in: " << *MCforPN.back() << "\n";
saveStateForValue (state, PhiCpRes, InstCount, -2);
}
}
++Insn;
++InstCount;
}
}