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[RegBankSelect] Use RegisterBankInfo applyMapping method.

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The RegBankSelect pass can now rely on the target to do the remapping of
the instructions.

llvm-svn: 272169
This commit is contained in:
Quentin Colombet 2016-06-08 16:45:04 +00:00
parent 4eea10684e
commit 0141b84745
1 changed files with 8 additions and 11 deletions
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19
lib/CodeGen/GlobalISel/RegBankSelect.cpp
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@ -115,8 +115,6 @@ void RegBankSelect::repairReg(
// the source of the repairing.
unsigned Src = MO.getReg();
unsigned Dst = *NewVRegs.begin();
if (ValMapping.BreakDown.size() == 1)
MO.setReg(Dst);
// If we repair a definition, swap the source and destination for
// the repairing.
@ -460,13 +458,10 @@ RegBankSelect::MappingCost RegBankSelect::computeMapping(
void RegBankSelect::applyMapping(
MachineInstr &MI, const RegisterBankInfo::InstructionMapping &InstrMapping,
SmallVectorImpl<RegBankSelect::RepairingPlacement> &RepairPts) {
assert(InstrMapping.getID() == RegisterBankInfo::DefaultMappingID &&
"Rewriting of MI not implemented yet");
// First, place the repairing code.
bool NeedRewrite = false;
// OpdMapper will hold all the information needed for the rewritting.
RegisterBankInfo::OperandsMapper OpdMapper(MI, InstrMapping, *MRI);
// First, place the repairing code.
for (RepairingPlacement &RepairPt : RepairPts) {
assert(RepairPt.canMaterialize() &&
RepairPt.getKind() != RepairingPlacement::Impossible &&
@ -479,7 +474,6 @@ void RegBankSelect::applyMapping(
InstrMapping.getOperandMapping(OpIdx);
unsigned BreakDownSize = ValMapping.BreakDown.size();
unsigned Reg = MO.getReg();
NeedRewrite = BreakDownSize != 1;
switch (RepairPt.getKind()) {
case RepairingPlacement::Reassign:
@ -496,8 +490,7 @@ void RegBankSelect::applyMapping(
}
}
// Second, rewrite the instruction.
(void)NeedRewrite;
assert(!NeedRewrite && "Not implemented yet");
RBI->applyMapping(OpdMapper);
}
void RegBankSelect::assignInstr(MachineInstr &MI) {
@ -544,8 +537,12 @@ bool RegBankSelect::runOnMachineFunction(MachineFunction &MF) {
// Set a sensible insertion point so that subsequent calls to
// MIRBuilder.
MIRBuilder.setMBB(*MBB);
for (MachineInstr &MI : *MBB)
assignInstr(MI);
for (MachineBasicBlock::iterator MII = MBB->begin(), End = MBB->end();
MII != End;) {
// MI might be invalidated by the assignment, so move the
// iterator before hand.
assignInstr(*MII++);
}
}
OptMode = SaveOptMode;
return false;