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Eliminate iOS-specific tail call instructions.

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After register masks were introdruced to represent the call clobbers, it
is no longer necessary to have duplicate instruction for iOS.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154209 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2012-04-06 21:17:42 +00:00
parent 3e59b5edd6
commit aa395e8c5d
3 changed files with 27 additions and 75 deletions
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lib/Target/ARM/ARMFrameLowering.cpp
+6 -13
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@@ -422,17 +422,16 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
if (AFI->getGPRCalleeSavedArea1Size()) MBBI++;
}
if (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNdiND ||
RetOpcode == ARM::TCRETURNri || RetOpcode == ARM::TCRETURNriND) {
if (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNri) {
// Tail call return: adjust the stack pointer and jump to callee.
MBBI = MBB.getLastNonDebugInstr();
MachineOperand &JumpTarget = MBBI->getOperand(0);
// Jump to label or value in register.
if (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNdiND) {
unsigned TCOpcode = (RetOpcode == ARM::TCRETURNdi)
? (STI.isThumb() ? ARM::tTAILJMPd : ARM::TAILJMPd)
: (STI.isThumb() ? ARM::tTAILJMPdND : ARM::TAILJMPdND);
if (RetOpcode == ARM::TCRETURNdi) {
unsigned TCOpcode = STI.isThumb() ?
(STI.isTargetIOS() ? ARM::tTAILJMPd : ARM::tTAILJMPdND) :
ARM::TAILJMPd;
MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(TCOpcode));
if (JumpTarget.isGlobal())
MIB.addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
@@ -449,10 +448,6 @@ void ARMFrameLowering::emitEpilogue(MachineFunction &MF,
BuildMI(MBB, MBBI, dl,
TII.get(STI.isThumb() ? ARM::tTAILJMPr : ARM::TAILJMPr)).
addReg(JumpTarget.getReg(), RegState::Kill);
} else if (RetOpcode == ARM::TCRETURNriND) {
BuildMI(MBB, MBBI, dl,
TII.get(STI.isThumb() ? ARM::tTAILJMPrND : ARM::TAILJMPrND)).
addReg(JumpTarget.getReg(), RegState::Kill);
}
MachineInstr *NewMI = prior(MBBI);
@@ -648,9 +643,7 @@ void ARMFrameLowering::emitPopInst(MachineBasicBlock &MBB,
DebugLoc DL = MI->getDebugLoc();
unsigned RetOpcode = MI->getOpcode();
bool isTailCall = (RetOpcode == ARM::TCRETURNdi ||
RetOpcode == ARM::TCRETURNdiND ||
RetOpcode == ARM::TCRETURNri ||
RetOpcode == ARM::TCRETURNriND);
RetOpcode == ARM::TCRETURNri);
SmallVector<unsigned, 4> Regs;
unsigned i = CSI.size();