Revert "r227976 - [PowerPC] Yet another approach to __tls_get_addr" and related fixups

Unfortunately, even with the workaround of disabling the linker TLS
optimizations in Clang restored (which has already been done), this still
breaks self-hosting on my P7 machine (-O3 -DNDEBUG -mcpu=native).

Bill is currently working on an alternate implementation to address the TLS
issue in a way that also fully elides the linker bug (which, unfortunately,
this approach did not fully), so I'm reverting this now.

llvm-svn: 228460

1 files changed, 0 insertions, 113 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCTLSDynamicCall.cpp b/llvm/lib/Target/PowerPC/PPCTLSDynamicCall.cpp
deleted file mode 100644
index a665fc6..0000000
--- a/llvm/lib/Target/PowerPC/PPCTLSDynamicCall.cpp
+++ /dev/null
@@ -1,113 +0,0 @@
-//===---------- 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 fixes up GETtls[ld]ADDR[32] machine instructions so that
-// they read and write GPR3.  These are really call instructions, so
-// must use the calling convention registers.  This is done in a late
-// pass so that TLS variable accesses can be fully commoned.
-//
-//===----------------------------------------------------------------------===//
-
-#include "PPCInstrInfo.h"
-#include "PPC.h"
-#include "PPCInstrBuilder.h"
-#include "PPCTargetMachine.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 {
-  // PPCTLSDynamicCall pass - Add copies to and from GPR3 around
-  // GETtls[ld]ADDR[32] machine instructions.  These instructions
-  // are actually call instructions, so the register choice is
-  // constrained.  We delay introducing these copies as late as
-  // possible so that TLS variable accesses can be fully commoned.
-  struct PPCTLSDynamicCall : public MachineFunctionPass {
-    static char ID;
-    PPCTLSDynamicCall() : MachineFunctionPass(ID) {
-      initializePPCTLSDynamicCallPass(*PassRegistry::getPassRegistry());
-    }
-
-    const PPCTargetMachine *TM;
-    const PPCInstrInfo *TII;
-
-protected:
-    bool processBlock(MachineBasicBlock &MBB) {
-      bool Changed = false;
-      bool Is64Bit = TM->getSubtargetImpl()->isPPC64();
-
-      for (MachineBasicBlock::iterator I = MBB.begin(), IE = MBB.end();
-           I != IE; ++I) {
-        MachineInstr *MI = I;
-
-        if (MI->getOpcode() != PPC::GETtlsADDR &&
-            MI->getOpcode() != PPC::GETtlsldADDR &&
-            MI->getOpcode() != PPC::GETtlsADDR32 &&
-            MI->getOpcode() != PPC::GETtlsldADDR32)
-          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;
-
-        BuildMI(MBB, I, DL, TII->get(TargetOpcode::COPY), GPR3)
-          .addReg(InReg);
-        MI->getOperand(0).setReg(GPR3);
-        MI->getOperand(1).setReg(GPR3);
-        BuildMI(MBB, ++I, DL, TII->get(TargetOpcode::COPY), OutReg)
-          .addReg(GPR3);
-
-        Changed = true;
-      }
-
-      return Changed;
-    }
-
-public:
-    bool runOnMachineFunction(MachineFunction &MF) override {
-      TM = static_cast<const PPCTargetMachine *>(&MF.getTarget());
-      TII = TM->getSubtargetImpl()->getInstrInfo();
-
-      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 {
-      MachineFunctionPass::getAnalysisUsage(AU);
-    }
-  };
-}
-
-INITIALIZE_PASS_BEGIN(PPCTLSDynamicCall, DEBUG_TYPE,
-                      "PowerPC TLS Dynamic Call Fixup", false, false)
-INITIALIZE_PASS_END(PPCTLSDynamicCall, DEBUG_TYPE,
-                    "PowerPC TLS Dynamic Call Fixup", false, false)
-
-char PPCTLSDynamicCall::ID = 0;
-FunctionPass*
-llvm::createPPCTLSDynamicCallPass() { return new PPCTLSDynamicCall(); }