Lower thumbv4t & thumbv5 lo->lo copies through a push-pop sequence

[oota-llvm.git] / lib / Target / ARM / Thumb2InstrInfo.cpp

diff --git a/lib/Target/ARM/Thumb2InstrInfo.cpp b/lib/Target/ARM/Thumb2InstrInfo.cpp
index 82c57df74f5d06391dd56fb51bc207759a86afd2..91973e1c463e69ddc64721a01a3fd3c00dd9bbfe 100644 (file)
--- a/lib/Target/ARM/Thumb2InstrInfo.cpp
+++ b/lib/Target/ARM/Thumb2InstrInfo.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "Thumb2InstrInfo.h"
-#include "ARM.h"
 #include "ARMConstantPoolValue.h"
 #include "ARMMachineFunctionInfo.h"
 #include "MCTargetDesc/ARMAddressingModes.h"
@@ -36,7 +35,8 @@ Thumb2InstrInfo::Thumb2InstrInfo(const ARMSubtarget &STI)
 
 /// getNoopForMachoTarget - Return the noop instruction to use for a noop.
 void Thumb2InstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
-  NopInst.setOpcode(ARM::tNOP);
+  NopInst.setOpcode(ARM::tHINT);
+  NopInst.addOperand(MCOperand::CreateImm(0));
   NopInst.addOperand(MCOperand::CreateImm(ARMCC::AL));
   NopInst.addOperand(MCOperand::CreateReg(0));
 }
@@ -209,11 +209,27 @@ loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
   ARMBaseInstrInfo::loadRegFromStackSlot(MBB, I, DestReg, FI, RC, TRI);
 }
 
+void
+Thumb2InstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI,
+                                      Reloc::Model RM) const {
+  if (RM == Reloc::PIC_)
+    expandLoadStackGuardBase(MI, ARM::t2MOV_ga_pcrel, ARM::t2LDRi12, RM);
+  else
+    expandLoadStackGuardBase(MI, ARM::t2MOVi32imm, ARM::t2LDRi12, RM);
+}
+
 void llvm::emitT2RegPlusImmediate(MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator &MBBI, DebugLoc dl,
                                unsigned DestReg, unsigned BaseReg, int NumBytes,
                                ARMCC::CondCodes Pred, unsigned PredReg,
                                const ARMBaseInstrInfo &TII, unsigned MIFlags) {
+  if (NumBytes == 0 && DestReg != BaseReg) {
+    BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr), DestReg)
+      .addReg(BaseReg, RegState::Kill)
+      .addImm((unsigned)Pred).addReg(PredReg).setMIFlags(MIFlags);
+    return;
+  }
+
   bool isSub = NumBytes < 0;
   if (isSub) NumBytes = -NumBytes;