Reinstate "Nuke the old JIT."

[oota-llvm.git] / lib / Target / Mips / MipsLongBranch.cpp

diff --git a/lib/Target/Mips/MipsLongBranch.cpp b/lib/Target/Mips/MipsLongBranch.cpp
index e72db15c98c9c11dfabd9b9ddc1bfdb400e19e3f..71a6f4d4a11e074c9bccfaacd59764d44ddf169d 100644 (file)
--- a/lib/Target/Mips/MipsLongBranch.cpp
+++ b/lib/Target/Mips/MipsLongBranch.cpp
@@ -16,6 +16,7 @@
 #include "Mips.h"
 #include "MCTargetDesc/MipsBaseInfo.h"
 #include "MCTargetDesc/MipsMCNaCl.h"
+#include "MipsMachineFunction.h"
 #include "MipsTargetMachine.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
@@ -170,7 +171,7 @@ void MipsLongBranch::initMBBInfo() {
   MBBInfos.resize(MF->size());
 
   const MipsInstrInfo *TII =
-    static_cast<const MipsInstrInfo*>(TM.getInstrInfo());
+      static_cast<const MipsInstrInfo *>(TM.getSubtargetImpl()->getInstrInfo());
   for (unsigned I = 0, E = MBBInfos.size(); I < E; ++I) {
     MachineBasicBlock *MBB = MF->getBlockNumbered(I);
 
@@ -217,7 +218,7 @@ int64_t MipsLongBranch::computeOffset(const MachineInstr *Br) {
 void MipsLongBranch::replaceBranch(MachineBasicBlock &MBB, Iter Br,
                                    DebugLoc DL, MachineBasicBlock *MBBOpnd) {
   const MipsInstrInfo *TII =
-    static_cast<const MipsInstrInfo*>(TM.getInstrInfo());
+      static_cast<const MipsInstrInfo *>(TM.getSubtargetImpl()->getInstrInfo());
   unsigned NewOpc = TII->getOppositeBranchOpc(Br->getOpcode());
   const MCInstrDesc &NewDesc = TII->get(NewOpc);
 
@@ -254,7 +255,7 @@ void MipsLongBranch::expandToLongBranch(MBBInfo &I) {
   MachineBasicBlock *LongBrMBB = MF->CreateMachineBasicBlock(BB);
 
   const MipsInstrInfo *TII =
-    static_cast<const MipsInstrInfo*>(TM.getInstrInfo());
+      static_cast<const MipsInstrInfo *>(TM.getSubtargetImpl()->getInstrInfo());
 
   MF->insert(FallThroughMBB, LongBrMBB);
   MBB->removeSuccessor(TgtMBB);
@@ -266,6 +267,13 @@ void MipsLongBranch::expandToLongBranch(MBBInfo &I) {
     LongBrMBB->addSuccessor(BalTgtMBB);
     BalTgtMBB->addSuccessor(TgtMBB);
 
+    // We must select between the MIPS32r6/MIPS64r6 BAL (which is a normal
+    // instruction) and the pre-MIPS32r6/MIPS64r6 definition (which is an
+    // pseudo-instruction wrapping BGEZAL).
+
+    const MipsSubtarget &Subtarget = TM.getSubtarget<MipsSubtarget>();
+    unsigned BalOp = Subtarget.hasMips32r6() ? Mips::BAL : Mips::BAL_BR;
+
     if (ABI != MipsSubtarget::N64) {
       // $longbr:
       //  addiu $sp, $sp, -8
@@ -307,9 +315,11 @@ void MipsLongBranch::expandToLongBranch(MBBInfo &I) {
       BuildMI(*LongBrMBB, Pos, DL, TII->get(Mips::LONG_BRANCH_LUi), Mips::AT)
         .addMBB(TgtMBB).addMBB(BalTgtMBB);
       MIBundleBuilder(*LongBrMBB, Pos)
-        .append(BuildMI(*MF, DL, TII->get(Mips::BAL_BR)).addMBB(BalTgtMBB))
-        .append(BuildMI(*MF, DL, TII->get(Mips::LONG_BRANCH_ADDiu), Mips::AT)
-                  .addReg(Mips::AT).addMBB(TgtMBB).addMBB(BalTgtMBB));
+          .append(BuildMI(*MF, DL, TII->get(BalOp)).addMBB(BalTgtMBB))
+          .append(BuildMI(*MF, DL, TII->get(Mips::LONG_BRANCH_ADDiu), Mips::AT)
+                      .addReg(Mips::AT)
+                      .addMBB(TgtMBB)
+                      .addMBB(BalTgtMBB));
 
       Pos = BalTgtMBB->begin();
 
@@ -379,11 +389,12 @@ void MipsLongBranch::expandToLongBranch(MBBInfo &I) {
         .addReg(Mips::AT_64).addImm(16);
 
       MIBundleBuilder(*LongBrMBB, Pos)
-        .append(BuildMI(*MF, DL, TII->get(Mips::BAL_BR)).addMBB(BalTgtMBB))
-        .append(BuildMI(*MF, DL, TII->get(Mips::LONG_BRANCH_DADDiu),
-                        Mips::AT_64).addReg(Mips::AT_64)
-                                    .addMBB(TgtMBB, MipsII::MO_ABS_LO)
-                                    .addMBB(BalTgtMBB));
+          .append(BuildMI(*MF, DL, TII->get(BalOp)).addMBB(BalTgtMBB))
+          .append(
+              BuildMI(*MF, DL, TII->get(Mips::LONG_BRANCH_DADDiu), Mips::AT_64)
+                  .addReg(Mips::AT_64)
+                  .addMBB(TgtMBB, MipsII::MO_ABS_LO)
+                  .addMBB(BalTgtMBB));
 
       Pos = BalTgtMBB->begin();
 
@@ -437,9 +448,10 @@ static void emitGPDisp(MachineFunction &F, const MipsInstrInfo *TII) {
 
 bool MipsLongBranch::runOnMachineFunction(MachineFunction &F) {
   const MipsInstrInfo *TII =
-    static_cast<const MipsInstrInfo*>(TM.getInstrInfo());
+      static_cast<const MipsInstrInfo *>(TM.getSubtargetImpl()->getInstrInfo());
 
-  if (TM.getSubtarget<MipsSubtarget>().inMips16Mode())
+  const MipsSubtarget &STI = TM.getSubtarget<MipsSubtarget>();
+  if (STI.inMips16Mode() || !STI.enableLongBranchPass())
     return false;
   if ((TM.getRelocationModel() == Reloc::PIC_) &&
       TM.getSubtarget<MipsSubtarget>().isABI_O32() &&