From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Thu, 29 Sep 2011 02:48:41 +0000 (+0000)
Subject: Use ExecutionDepsFix instead of NEONMoveFix.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8bb3d3cb30df06bdcb3ef5a208e3e59f4eeb4868;p=oota-llvm.git

Use ExecutionDepsFix instead of NEONMoveFix.

This enables NEON domain tracking across basic blocks, but should
otherwise do the same thing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140772 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMBaseInstrInfo.cpp b/lib/Target/ARM/ARMBaseInstrInfo.cpp
index 70ac487e4bf..30830974355 100644
--- a/lib/Target/ARM/ARMBaseInstrInfo.cpp
+++ b/lib/Target/ARM/ARMBaseInstrInfo.cpp
@@ -2732,9 +2732,11 @@ ARMBaseInstrInfo::isFpMLxInstruction(unsigned Opcode, unsigned &MulOpc,
 //
 // We use the following execution domain numbering:
 //
-//   0: Generic
-//   1: VFP
-//   2: NEON
+enum ARMExeDomain {
+  ExeGeneric = 0,
+  ExeVFP = 1,
+  ExeNEON = 2
+};
 //
 // Also see ARMInstrFormats.td and Domain* enums in ARMBaseInfo.h
 //
@@ -2743,33 +2745,41 @@ ARMBaseInstrInfo::getExecutionDomain(const MachineInstr *MI) const {
   // VMOVD is a VFP instruction, but can be changed to NEON if it isn't
   // predicated.
   if (MI->getOpcode() == ARM::VMOVD && !isPredicated(MI))
-    return std::make_pair(1, 3);
+    return std::make_pair(ExeVFP, (1<<ExeVFP) | (1<<ExeNEON));
 
   // No other instructions can be swizzled, so just determine their domain.
   unsigned Domain = MI->getDesc().TSFlags & ARMII::DomainMask;
 
   if (Domain & ARMII::DomainNEON)
-    return std::make_pair(2, 0);
+    return std::make_pair(ExeNEON, 0);
 
   // Certain instructions can go either way on Cortex-A8.
   // Treat them as NEON instructions.
   if ((Domain & ARMII::DomainNEONA8) && Subtarget.isCortexA8())
-    return std::make_pair(2, 0);
+    return std::make_pair(ExeNEON, 0);
 
   if (Domain & ARMII::DomainVFP)
-    return std::make_pair(1, 0);
+    return std::make_pair(ExeVFP, 0);
 
-  return std::make_pair(0, 0);
+  return std::make_pair(ExeGeneric, 0);
 }
 
 void
 ARMBaseInstrInfo::setExecutionDomain(MachineInstr *MI, unsigned Domain) const {
   // We only know how to change VMOVD into VORR.
   assert(MI->getOpcode() == ARM::VMOVD && "Can only swizzle VMOVD");
-  if (Domain != 2)
+  if (Domain != ExeNEON)
     return;
 
+  // Zap the predicate operands.
+  assert(!isPredicated(MI) && "Cannot predicate a VORRd");
+  MI->RemoveOperand(3);
+  MI->RemoveOperand(2);
+
   // Change to a VORRd which requires two identical use operands.
   MI->setDesc(get(ARM::VORRd));
-  MachineInstrBuilder(MI).addReg(MI->getOperand(1).getReg());
+
+  // Add the extra source operand and new predicates.
+  // This will go before any implicit ops.
+  AddDefaultPred(MachineInstrBuilder(MI).addReg(MI->getOperand(1).getReg()));
 }
diff --git a/lib/Target/ARM/ARMTargetMachine.cpp b/lib/Target/ARM/ARMTargetMachine.cpp
index 2cd818abf3f..f779ede3e3a 100644
--- a/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/lib/Target/ARM/ARMTargetMachine.cpp
@@ -118,7 +118,7 @@ bool ARMBaseTargetMachine::addPreSched2(PassManagerBase &PM,
     if (!Subtarget.isThumb1Only())
       PM.add(createARMLoadStoreOptimizationPass());
     if (Subtarget.hasNEON())
-      PM.add(createNEONMoveFixPass());
+      PM.add(createExecutionDependencyFixPass(&ARM::DPRRegClass));
   }
 
   // Expand some pseudo instructions into multiple instructions to allow