Pull in r199014 from upstream llvm trunk (by Venkatraman Govindaraju):

  [Sparc] Bundle instruction with delay slow and its filler. Now, we can use -verify-machineinstrs with SPARC backend.

Introduced here: http://svnweb.freebsd.org/changeset/base/262261

Index: lib/Target/Sparc/DelaySlotFiller.cpp
===================================================================
--- lib/Target/Sparc/DelaySlotFiller.cpp
+++ lib/Target/Sparc/DelaySlotFiller.cpp
@@ -19,6 +19,7 @@
 #include "llvm/ADT/Statistic.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetMachine.h"
@@ -55,6 +56,11 @@ namespace {
     bool runOnMachineBasicBlock(MachineBasicBlock &MBB);
     bool runOnMachineFunction(MachineFunction &F) {
       bool Changed = false;
+
+      // This pass invalidates liveness information when it reorders
+      // instructions to fill delay slot.
+      F.getRegInfo().invalidateLiveness();
+
       for (MachineFunction::iterator FI = F.begin(), FE = F.end();
            FI != FE; ++FI)
         Changed |= runOnMachineBasicBlock(*FI);
@@ -61,9 +67,6 @@ namespace {
       return Changed;
     }
 
-    bool isDelayFiller(MachineBasicBlock &MBB,
-                       MachineBasicBlock::iterator candidate);
-
     void insertCallDefsUses(MachineBasicBlock::iterator MI,
                             SmallSet<unsigned, 32>& RegDefs,
                             SmallSet<unsigned, 32>& RegUses);
@@ -152,6 +155,10 @@ bool Filler::runOnMachineBasicBlock(MachineBasicBl
       assert (J != MBB.end() && "MI needs a delay instruction.");
       BuildMI(MBB, ++J, MI->getDebugLoc(),
               TII->get(SP::UNIMP)).addImm(structSize);
+      // Bundle the delay filler and unimp with the instruction.
+      MIBundleBuilder(MBB, MachineBasicBlock::iterator(MI), J);
+    } else {
+      MIBundleBuilder(MBB, MachineBasicBlock::iterator(MI), I);
     }
   }
   return Changed;
@@ -209,7 +216,7 @@ Filler::findDelayInstr(MachineBasicBlock &MBB,
         || I->isInlineAsm()
         || I->isLabel()
         || I->hasDelaySlot()
-        || isDelayFiller(MBB, I))
+        || I->isBundledWithSucc())
       break;
 
     if (delayHasHazard(I, sawLoad, sawStore, RegDefs, RegUses)) {
@@ -332,18 +339,6 @@ bool Filler::IsRegInSet(SmallSet<unsigned, 32>& Re
   return false;
 }
 
-// return true if the candidate is a delay filler.
-bool Filler::isDelayFiller(MachineBasicBlock &MBB,
-                           MachineBasicBlock::iterator candidate)
-{
-  if (candidate == MBB.begin())
-    return false;
-  if (candidate->getOpcode() == SP::UNIMP)
-    return true;
-  --candidate;
-  return candidate->hasDelaySlot();
-}
-
 bool Filler::needsUnimp(MachineBasicBlock::iterator I, unsigned &StructSize)
 {
   if (!I->isCall())
@@ -484,10 +479,10 @@ bool Filler::tryCombineRestoreWithPrevInst(Machine
          && MBBI->getOperand(1).getReg() == SP::G0
          && MBBI->getOperand(2).getReg() == SP::G0);
 
-  MachineBasicBlock::iterator PrevInst = MBBI; --PrevInst;
+  MachineBasicBlock::iterator PrevInst = llvm::prior(MBBI);
 
-  // It cannot combine with a delay filler.
-  if (isDelayFiller(MBB, PrevInst))
+  // It cannot be combined with a bundled instruction.
+  if (PrevInst->isBundledWithSucc())
     return false;
 
   const TargetInstrInfo *TII = TM.getInstrInfo();
Index: lib/Target/Sparc/SparcAsmPrinter.cpp
===================================================================
--- lib/Target/Sparc/SparcAsmPrinter.cpp
+++ lib/Target/Sparc/SparcAsmPrinter.cpp
@@ -184,7 +184,6 @@ static void LowerGETPCXAndEmitMCInsts(const Machin
 
 void SparcAsmPrinter::EmitInstruction(const MachineInstr *MI)
 {
-  MCInst TmpInst;
 
   switch (MI->getOpcode()) {
   default: break;
@@ -195,8 +194,13 @@ void SparcAsmPrinter::EmitInstruction(const Machin
     LowerGETPCXAndEmitMCInsts(MI, OutStreamer, OutContext);
     return;
   }
-  LowerSparcMachineInstrToMCInst(MI, TmpInst, *this);
-  OutStreamer.EmitInstruction(TmpInst);
+  MachineBasicBlock::const_instr_iterator I = MI;
+  MachineBasicBlock::const_instr_iterator E = MI->getParent()->instr_end();
+  do {
+    MCInst TmpInst;
+    LowerSparcMachineInstrToMCInst(I, TmpInst, *this);
+    OutStreamer.EmitInstruction(TmpInst);
+  } while ((++I != E) && I->isInsideBundle()); // Delay slot check.
 }
 
 void SparcAsmPrinter::EmitFunctionBodyStart() {
Index: test/CodeGen/SPARC/2011-01-19-DelaySlot.ll
===================================================================
--- test/CodeGen/SPARC/2011-01-19-DelaySlot.ll
+++ test/CodeGen/SPARC/2011-01-19-DelaySlot.ll
@@ -1,5 +1,5 @@
-;RUN: llc -march=sparc < %s | FileCheck %s
-;RUN: llc -march=sparc -O0 < %s | FileCheck %s -check-prefix=UNOPT
+;RUN: llc -march=sparc < %s -verify-machineinstrs | FileCheck %s
+;RUN: llc -march=sparc -O0 < %s -verify-machineinstrs | FileCheck %s -check-prefix=UNOPT
 
 
 define i32 @test(i32 %a) nounwind {