1 files changed, 168 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCTLSDynamicCall.cpp b/lib/Target/PowerPC/PPCTLSDynamicCall.cpp
new file mode 100644
index 0000000..270fc71
--- /dev/null
+++ b/lib/Target/PowerPC/PPCTLSDynamicCall.cpp
@@ -0,0 +1,168 @@
+//===---------- PPCTLSDynamicCall.cpp - TLS Dynamic Call Fixup ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass expands ADDItls{ld,gd}LADDR[32] machine instructions into
+// separate ADDItls[gd]L[32] and GETtlsADDR[32] instructions, both of
+// which define GPR3.  A copy is added from GPR3 to the target virtual
+// register of the original instruction.  The GETtlsADDR[32] is really
+// a call instruction, so its target register is constrained to be GPR3.
+// This is not true of ADDItls[gd]L[32], but there is a legacy linker
+// optimization bug that requires the target register of the addi of
+// a local- or general-dynamic TLS access sequence to be GPR3.
+//
+// This is done in a late pass so that TLS variable accesses can be
+// fully commoned by MachineCSE.
+//
+//===----------------------------------------------------------------------===//
+
+#include "PPCInstrInfo.h"
+#include "PPC.h"
+#include "PPCInstrBuilder.h"
+#include "PPCTargetMachine.h"
+#include "llvm/CodeGen/LiveIntervalAnalysis.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+#define DEBUG_TYPE "ppc-tls-dynamic-call"
+
+namespace llvm {
+  void initializePPCTLSDynamicCallPass(PassRegistry&);
+}
+
+namespace {
+  struct PPCTLSDynamicCall : public MachineFunctionPass {
+    static char ID;
+    PPCTLSDynamicCall() : MachineFunctionPass(ID) {
+      initializePPCTLSDynamicCallPass(*PassRegistry::getPassRegistry());
+    }
+
+    const PPCInstrInfo *TII;
+    LiveIntervals *LIS;
+
+protected:
+    bool processBlock(MachineBasicBlock &MBB) {
+      bool Changed = false;
+      bool Is64Bit = MBB.getParent()->getSubtarget<PPCSubtarget>().isPPC64();
+
+      for (MachineBasicBlock::iterator I = MBB.begin(), IE = MBB.end();
+           I != IE; ++I) {
+        MachineInstr *MI = I;
+
+        if (MI->getOpcode() != PPC::ADDItlsgdLADDR &&
+            MI->getOpcode() != PPC::ADDItlsldLADDR &&
+            MI->getOpcode() != PPC::ADDItlsgdLADDR32 &&
+            MI->getOpcode() != PPC::ADDItlsldLADDR32)
+          continue;
+
+        DEBUG(dbgs() << "TLS Dynamic Call Fixup:\n    " << *MI;);
+
+        unsigned OutReg = MI->getOperand(0).getReg();
+        unsigned InReg  = MI->getOperand(1).getReg();
+        DebugLoc DL = MI->getDebugLoc();
+        unsigned GPR3 = Is64Bit ? PPC::X3 : PPC::R3;
+        unsigned Opc1, Opc2;
+        SmallVector<unsigned, 4> OrigRegs;
+        OrigRegs.push_back(OutReg);
+        OrigRegs.push_back(InReg);
+        OrigRegs.push_back(GPR3);
+
+        switch (MI->getOpcode()) {
+        default:
+          llvm_unreachable("Opcode inconsistency error");
+        case PPC::ADDItlsgdLADDR:
+          Opc1 = PPC::ADDItlsgdL;
+          Opc2 = PPC::GETtlsADDR;
+          break;
+        case PPC::ADDItlsldLADDR:
+          Opc1 = PPC::ADDItlsldL;
+          Opc2 = PPC::GETtlsldADDR;
+          break;
+        case PPC::ADDItlsgdLADDR32:
+          Opc1 = PPC::ADDItlsgdL32;
+          Opc2 = PPC::GETtlsADDR32;
+          break;
+        case PPC::ADDItlsldLADDR32:
+          Opc1 = PPC::ADDItlsldL32;
+          Opc2 = PPC::GETtlsldADDR32;
+          break;
+        }
+
+        // Expand into two ops built prior to the existing instruction.
+        MachineInstr *Addi = BuildMI(MBB, I, DL, TII->get(Opc1), GPR3)
+          .addReg(InReg);
+        Addi->addOperand(MI->getOperand(2));
+
+        // The ADDItls* instruction is the first instruction in the
+        // repair range.
+        MachineBasicBlock::iterator First = I;
+        --First;
+
+        MachineInstr *Call = (BuildMI(MBB, I, DL, TII->get(Opc2), GPR3)
+                              .addReg(GPR3));
+        Call->addOperand(MI->getOperand(3));
+
+        BuildMI(MBB, I, DL, TII->get(TargetOpcode::COPY), OutReg)
+          .addReg(GPR3);
+
+        // The COPY is the last instruction in the repair range.
+        MachineBasicBlock::iterator Last = I;
+        --Last;
+
+        // Move past the original instruction and remove it.
+        ++I;
+        MI->removeFromParent();
+
+        // Repair the live intervals.
+        LIS->repairIntervalsInRange(&MBB, First, Last, OrigRegs);
+        Changed = true;
+      }
+
+      return Changed;
+    }
+
+public:
+    bool runOnMachineFunction(MachineFunction &MF) override {
+      TII = MF.getSubtarget<PPCSubtarget>().getInstrInfo();
+      LIS = &getAnalysis<LiveIntervals>();
+
+      bool Changed = false;
+
+      for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
+        MachineBasicBlock &B = *I++;
+        if (processBlock(B))
+          Changed = true;
+      }
+
+      return Changed;
+    }
+
+    void getAnalysisUsage(AnalysisUsage &AU) const override {
+      AU.addRequired<LiveIntervals>();
+      AU.addPreserved<LiveIntervals>();
+      AU.addRequired<SlotIndexes>();
+      AU.addPreserved<SlotIndexes>();
+      MachineFunctionPass::getAnalysisUsage(AU);
+    }
+  };
+}
+
+INITIALIZE_PASS_BEGIN(PPCTLSDynamicCall, DEBUG_TYPE,
+                      "PowerPC TLS Dynamic Call Fixup", false, false)
+INITIALIZE_PASS_DEPENDENCY(LiveIntervals)
+INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
+INITIALIZE_PASS_END(PPCTLSDynamicCall, DEBUG_TYPE,
+                    "PowerPC TLS Dynamic Call Fixup", false, false)
+
+char PPCTLSDynamicCall::ID = 0;
+FunctionPass*
+llvm::createPPCTLSDynamicCallPass() { return new PPCTLSDynamicCall(); }