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[Hexagon] Use single tailcall pseudoinst and fix checking for label jumping versus tail calling.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231713 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Colin LeMahieu
2015-03-09 22:05:21 +00:00
parent ffc2de43d9
commit e8cbce94fd
4 changed files with 42 additions and 15 deletions
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31
lib/Target/Hexagon/HexagonInstrInfo.cpp
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@@ -211,9 +211,11 @@ bool HexagonInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
return false;
--I;
}
bool JumpToBlock = I->getOpcode() == Hexagon::J2_jump &&
I->getOperand(0).isMBB();
// Delete the JMP if it's equivalent to a fall-through.
if (AllowModify && I->getOpcode() == Hexagon::J2_jump &&
if (AllowModify && JumpToBlock &&
MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
DEBUG(dbgs()<< "\nErasing the jump to successor block\n";);
I->eraseFromParent();
@@ -243,6 +245,14 @@ bool HexagonInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
} while(I);
int LastOpcode = LastInst->getOpcode();
int SecLastOpcode = SecondLastInst ? SecondLastInst->getOpcode() : 0;
// If the branch target is not a basic block, it could be a tail call.
// (It is, if the target is a function.)
if (LastOpcode == Hexagon::J2_jump && !LastInst->getOperand(0).isMBB())
return true;
if (SecLastOpcode == Hexagon::J2_jump &&
!SecondLastInst->getOperand(0).isMBB())
return true;
bool LastOpcodeHasJMP_c = PredOpcodeHasJMP_c(LastOpcode);
bool LastOpcodeHasNot = PredOpcodeHasNot(LastOpcode);
@@ -270,8 +280,6 @@ bool HexagonInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
return true;
}
int SecLastOpcode = SecondLastInst->getOpcode();
bool SecLastOpcodeHasJMP_c = PredOpcodeHasJMP_c(SecLastOpcode);
bool SecLastOpcodeHasNot = PredOpcodeHasNot(SecLastOpcode);
if (SecLastOpcodeHasJMP_c && (LastOpcode == Hexagon::J2_jump)) {
@@ -549,6 +557,21 @@ void HexagonInstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
llvm_unreachable("Unimplemented");
}
bool
HexagonInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
unsigned Opc = MI->getOpcode();
switch (Opc) {
case Hexagon::TCRETURNi:
MI->setDesc(get(Hexagon::J2_jump));
return true;
case Hexagon::TCRETURNr:
MI->setDesc(get(Hexagon::J2_jumpr));
return true;
}
return false;
}
MachineInstr *HexagonInstrInfo::foldMemoryOperandImpl(MachineFunction &MF,
MachineInstr *MI,