diff --git a/lib/Target/R600/R600Packetizer.cpp b/lib/Target/R600/R600Packetizer.cpp
index 05e96f1..cd7b7d0 100644
--- a/lib/Target/R600/R600Packetizer.cpp
+++ b/lib/Target/R600/R600Packetizer.cpp
@@ -73,24 +73,56 @@
     return TRI.getHWRegChan(MI->getOperand(0).getReg());
   }
 
-  std::vector<unsigned> getPreviousVector(MachineBasicBlock::iterator I) const {
-    std::vector<unsigned> Result;
+  /// \returns register to PV chan mapping for bundle/single instructions that
+  /// immediatly precedes I.
+  DenseMap<unsigned, unsigned> getPreviousVector(MachineBasicBlock::iterator I)
+      const {
+    DenseMap<unsigned, unsigned> Result;
     I--;
     if (!TII->isALUInstr(I->getOpcode()) && !I->isBundle())
       return Result;
     MachineBasicBlock::instr_iterator BI = I.getInstrIterator();
     if (I->isBundle())
       BI++;
-    while (BI->isBundledWithPred() && !TII->isPredicated(BI)) {
+    do {
+      if (TII->isPredicated(BI))
+        continue;
+      if (TII->isTransOnly(BI))
+        continue;
       int OperandIdx = TII->getOperandIdx(BI->getOpcode(), R600Operands::WRITE);
-      if (OperandIdx > -1 && BI->getOperand(OperandIdx).getImm())
-        Result.push_back(BI->getOperand(0).getReg());
-      BI++;
-    }
+      if (OperandIdx < 0)
+        continue;
+      if (BI->getOperand(OperandIdx).getImm() == 0)
+        continue;
+      unsigned Dst = BI->getOperand(0).getReg();
+      if (BI->getOpcode() == AMDGPU::DOT4_r600_real) {
+        Result[Dst] = AMDGPU::PV_X;
+        continue;
+      }
+      unsigned PVReg = 0;
+      switch (TRI.getHWRegChan(Dst)) {
+      case 0:
+        PVReg = AMDGPU::PV_X;
+        break;
+      case 1:
+        PVReg = AMDGPU::PV_Y;
+        break;
+      case 2:
+        PVReg = AMDGPU::PV_Z;
+        break;
+      case 3:
+        PVReg = AMDGPU::PV_W;
+        break;
+      default:
+        llvm_unreachable("Invalid Chan");
+      }
+      Result[Dst] = PVReg;
+    } while ((++BI)->isBundledWithPred());
     return Result;
   }
 
-  void substitutePV(MachineInstr *MI, const std::vector<unsigned> &PV) const {
+  void substitutePV(MachineInstr *MI, const DenseMap<unsigned, unsigned> &PVs)
+      const {
     R600Operands::Ops Ops[] = {
       R600Operands::SRC0,
       R600Operands::SRC1,
@@ -101,30 +133,9 @@
       if (OperandIdx < 0)
         continue;
       unsigned Src = MI->getOperand(OperandIdx).getReg();
-      for (unsigned j = 0, e = PV.size(); j < e; j++) {
-        if (Src == PV[j]) {
-          unsigned Chan = TRI.getHWRegChan(Src);
-          unsigned PVReg;
-          switch (Chan) {
-          case 0:
-            PVReg = AMDGPU::PV_X;
-            break;
-          case 1:
-            PVReg = AMDGPU::PV_Y;
-            break;
-          case 2:
-            PVReg = AMDGPU::PV_Z;
-            break;
-          case 3:
-            PVReg = AMDGPU::PV_W;
-            break;
-          default:
-            llvm_unreachable("Invalid Chan");
-          }
-          MI->getOperand(OperandIdx).setReg(PVReg);
-          break;
-        }
-      }
+      const DenseMap<unsigned, unsigned>::const_iterator It = PVs.find(Src);
+      if (It != PVs.end())
+        MI->getOperand(OperandIdx).setReg(It->second);
     }
   }
 public:
@@ -209,7 +220,8 @@
         }
         dbgs() << "because of Consts read limitations\n";
       });
-    const std::vector<unsigned> &PV = getPreviousVector(MI);
+    const DenseMap<unsigned, unsigned> &PV =
+        getPreviousVector(CurrentPacketMIs.front());
     bool FitsReadPortLimits = fitsReadPortLimitation(CurrentPacketMIs, PV);
     DEBUG(
       if (!FitsReadPortLimits) {
@@ -236,7 +248,8 @@
   }
 private:
   std::vector<std::pair<int, unsigned> >
-  ExtractSrcs(const MachineInstr *MI, const std::vector<unsigned> &PV) const {
+  ExtractSrcs(const MachineInstr *MI, const DenseMap<unsigned, unsigned> &PV)
+      const {
     R600Operands::Ops Ops[] = {
       R600Operands::SRC0,
       R600Operands::SRC1,
@@ -250,7 +263,7 @@
         continue;
       }
       unsigned Src = MI->getOperand(OperandIdx).getReg();
-      if (std::find(PV.begin(), PV.end(), Src) != PV.end()) {
+      if (PV.find(Src) != PV.end()) {
         Result.push_back(std::pair<int, unsigned>(-1,0));
         continue;
       }
@@ -294,7 +307,7 @@
 
   bool isLegal(const std::vector<MachineInstr *> &IG,
       const std::vector<BankSwizzle> &Swz,
-      const std::vector<unsigned> &PV) const {
+      const DenseMap<unsigned, unsigned> &PV) const {
     assert (Swz.size() == IG.size());
     int Vector[4][3];
     memset(Vector, -1, sizeof(Vector));
@@ -316,7 +329,7 @@
 
   bool recursiveFitsFPLimitation(
   std::vector<MachineInstr *> IG,
-  const std::vector<unsigned> &PV,
+  const DenseMap<unsigned, unsigned> &PV,
   std::vector<BankSwizzle> &SwzCandidate,
   std::vector<MachineInstr *> CurrentlyChecked)
       const {
@@ -345,7 +358,7 @@
 
   bool fitsReadPortLimitation(
   std::vector<MachineInstr *> IG,
-  const std::vector<unsigned> &PV)
+  const DenseMap<unsigned, unsigned> &PV)
       const {
     //Todo : support shared src0 - src1 operand
     std::vector<BankSwizzle> SwzCandidate;
diff --git a/test/CodeGen/R600/pv.ll b/test/CodeGen/R600/pv.ll
new file mode 100644
index 0000000..37c3d9d
--- /dev/null
+++ b/test/CodeGen/R600/pv.ll
@@ -0,0 +1,244 @@
+; RUN: llc < %s -march=r600 | FileCheck %s
+
+;CHECK: DOT4 * T{{[0-9]\.W}} (MASKED)
+;CHECK-NEXT: CNDGE T{{[0-9].[XYZW]}}, PV.x
+
+define void @main() #0 {
+main_body:
+  %0 = call float @llvm.R600.load.input(i32 4)
+  %1 = call float @llvm.R600.load.input(i32 5)
+  %2 = call float @llvm.R600.load.input(i32 6)
+  %3 = call float @llvm.R600.load.input(i32 7)
+  %4 = call float @llvm.R600.load.input(i32 8)
+  %5 = call float @llvm.R600.load.input(i32 9)
+  %6 = call float @llvm.R600.load.input(i32 10)
+  %7 = call float @llvm.R600.load.input(i32 11)
+  %8 = call float @llvm.R600.load.input(i32 12)
+  %9 = call float @llvm.R600.load.input(i32 13)
+  %10 = call float @llvm.R600.load.input(i32 14)
+  %11 = call float @llvm.R600.load.input(i32 15)
+  %12 = call float @llvm.R600.load.input(i32 16)
+  %13 = call float @llvm.R600.load.input(i32 17)
+  %14 = call float @llvm.R600.load.input(i32 18)
+  %15 = call float @llvm.R600.load.input(i32 19)
+  %16 = call float @llvm.R600.load.input(i32 20)
+  %17 = call float @llvm.R600.load.input(i32 21)
+  %18 = call float @llvm.R600.load.input(i32 22)
+  %19 = call float @llvm.R600.load.input(i32 23)
+  %20 = call float @llvm.R600.load.input(i32 24)
+  %21 = call float @llvm.R600.load.input(i32 25)
+  %22 = call float @llvm.R600.load.input(i32 26)
+  %23 = call float @llvm.R600.load.input(i32 27)
+  %24 = call float @llvm.R600.load.input(i32 28)
+  %25 = call float @llvm.R600.load.input(i32 29)
+  %26 = call float @llvm.R600.load.input(i32 30)
+  %27 = call float @llvm.R600.load.input(i32 31)
+  %28 = load <4 x float> addrspace(8)* null
+  %29 = extractelement <4 x float> %28, i32 0
+  %30 = fmul float %0, %29
+  %31 = load <4 x float> addrspace(8)* null
+  %32 = extractelement <4 x float> %31, i32 1
+  %33 = fmul float %0, %32
+  %34 = load <4 x float> addrspace(8)* null
+  %35 = extractelement <4 x float> %34, i32 2
+  %36 = fmul float %0, %35
+  %37 = load <4 x float> addrspace(8)* null
+  %38 = extractelement <4 x float> %37, i32 3
+  %39 = fmul float %0, %38
+  %40 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
+  %41 = extractelement <4 x float> %40, i32 0
+  %42 = fmul float %1, %41
+  %43 = fadd float %42, %30
+  %44 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
+  %45 = extractelement <4 x float> %44, i32 1
+  %46 = fmul float %1, %45
+  %47 = fadd float %46, %33
+  %48 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
+  %49 = extractelement <4 x float> %48, i32 2
+  %50 = fmul float %1, %49
+  %51 = fadd float %50, %36
+  %52 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 1)
+  %53 = extractelement <4 x float> %52, i32 3
+  %54 = fmul float %1, %53
+  %55 = fadd float %54, %39
+  %56 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 2)
+  %57 = extractelement <4 x float> %56, i32 0
+  %58 = fmul float %2, %57
+  %59 = fadd float %58, %43
+  %60 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 2)
+  %61 = extractelement <4 x float> %60, i32 1
+  %62 = fmul float %2, %61
+  %63 = fadd float %62, %47
+  %64 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 2)
+  %65 = extractelement <4 x float> %64, i32 2
+  %66 = fmul float %2, %65
+  %67 = fadd float %66, %51
+  %68 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 2)
+  %69 = extractelement <4 x float> %68, i32 3
+  %70 = fmul float %2, %69
+  %71 = fadd float %70, %55
+  %72 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 3)
+  %73 = extractelement <4 x float> %72, i32 0
+  %74 = fmul float %3, %73
+  %75 = fadd float %74, %59
+  %76 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 3)
+  %77 = extractelement <4 x float> %76, i32 1
+  %78 = fmul float %3, %77
+  %79 = fadd float %78, %63
+  %80 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 3)
+  %81 = extractelement <4 x float> %80, i32 2
+  %82 = fmul float %3, %81
+  %83 = fadd float %82, %67
+  %84 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 3)
+  %85 = extractelement <4 x float> %84, i32 3
+  %86 = fmul float %3, %85
+  %87 = fadd float %86, %71
+  %88 = insertelement <4 x float> undef, float %4, i32 0
+  %89 = insertelement <4 x float> %88, float %5, i32 1
+  %90 = insertelement <4 x float> %89, float %6, i32 2
+  %91 = insertelement <4 x float> %90, float 0.000000e+00, i32 3
+  %92 = insertelement <4 x float> undef, float %4, i32 0
+  %93 = insertelement <4 x float> %92, float %5, i32 1
+  %94 = insertelement <4 x float> %93, float %6, i32 2
+  %95 = insertelement <4 x float> %94, float 0.000000e+00, i32 3
+  %96 = call float @llvm.AMDGPU.dp4(<4 x float> %91, <4 x float> %95)
+  %97 = call float @fabs(float %96)
+  %98 = call float @llvm.AMDGPU.rsq(float %97)
+  %99 = fmul float %4, %98
+  %100 = fmul float %5, %98
+  %101 = fmul float %6, %98
+  %102 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 4)
+  %103 = extractelement <4 x float> %102, i32 0
+  %104 = fmul float %103, %8
+  %105 = fadd float %104, %20
+  %106 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 4)
+  %107 = extractelement <4 x float> %106, i32 1
+  %108 = fmul float %107, %9
+  %109 = fadd float %108, %21
+  %110 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 4)
+  %111 = extractelement <4 x float> %110, i32 2
+  %112 = fmul float %111, %10
+  %113 = fadd float %112, %22
+  %114 = call float @llvm.AMDIL.clamp.(float %105, float 0.000000e+00, float 1.000000e+00)
+  %115 = call float @llvm.AMDIL.clamp.(float %109, float 0.000000e+00, float 1.000000e+00)
+  %116 = call float @llvm.AMDIL.clamp.(float %113, float 0.000000e+00, float 1.000000e+00)
+  %117 = call float @llvm.AMDIL.clamp.(float %15, float 0.000000e+00, float 1.000000e+00)
+  %118 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 5)
+  %119 = extractelement <4 x float> %118, i32 0
+  %120 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 5)
+  %121 = extractelement <4 x float> %120, i32 1
+  %122 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 5)
+  %123 = extractelement <4 x float> %122, i32 2
+  %124 = insertelement <4 x float> undef, float %99, i32 0
+  %125 = insertelement <4 x float> %124, float %100, i32 1
+  %126 = insertelement <4 x float> %125, float %101, i32 2
+  %127 = insertelement <4 x float> %126, float 0.000000e+00, i32 3
+  %128 = insertelement <4 x float> undef, float %119, i32 0
+  %129 = insertelement <4 x float> %128, float %121, i32 1
+  %130 = insertelement <4 x float> %129, float %123, i32 2
+  %131 = insertelement <4 x float> %130, float 0.000000e+00, i32 3
+  %132 = call float @llvm.AMDGPU.dp4(<4 x float> %127, <4 x float> %131)
+  %133 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 7)
+  %134 = extractelement <4 x float> %133, i32 0
+  %135 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 7)
+  %136 = extractelement <4 x float> %135, i32 1
+  %137 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 7)
+  %138 = extractelement <4 x float> %137, i32 2
+  %139 = insertelement <4 x float> undef, float %99, i32 0
+  %140 = insertelement <4 x float> %139, float %100, i32 1
+  %141 = insertelement <4 x float> %140, float %101, i32 2
+  %142 = insertelement <4 x float> %141, float 0.000000e+00, i32 3
+  %143 = insertelement <4 x float> undef, float %134, i32 0
+  %144 = insertelement <4 x float> %143, float %136, i32 1
+  %145 = insertelement <4 x float> %144, float %138, i32 2
+  %146 = insertelement <4 x float> %145, float 0.000000e+00, i32 3
+  %147 = call float @llvm.AMDGPU.dp4(<4 x float> %142, <4 x float> %146)
+  %148 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 8)
+  %149 = extractelement <4 x float> %148, i32 0
+  %150 = fmul float %149, %8
+  %151 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 8)
+  %152 = extractelement <4 x float> %151, i32 1
+  %153 = fmul float %152, %9
+  %154 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 8)
+  %155 = extractelement <4 x float> %154, i32 2
+  %156 = fmul float %155, %10
+  %157 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 9)
+  %158 = extractelement <4 x float> %157, i32 0
+  %159 = fmul float %158, %12
+  %160 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 9)
+  %161 = extractelement <4 x float> %160, i32 1
+  %162 = fmul float %161, %13
+  %163 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 9)
+  %164 = extractelement <4 x float> %163, i32 2
+  %165 = fmul float %164, %14
+  %166 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 10)
+  %167 = extractelement <4 x float> %166, i32 0
+  %168 = fmul float %167, %16
+  %169 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 10)
+  %170 = extractelement <4 x float> %169, i32 1
+  %171 = fmul float %170, %17
+  %172 = load <4 x float> addrspace(8)* getelementptr ([1024 x <4 x float>] addrspace(8)* null, i64 0, i32 10)
+  %173 = extractelement <4 x float> %172, i32 2
+  %174 = fmul float %173, %18
+  %175 = fcmp uge float %132, 0.000000e+00
+  %176 = select i1 %175, float %132, float 0.000000e+00
+  %177 = fcmp uge float %147, 0.000000e+00
+  %178 = select i1 %177, float %147, float 0.000000e+00
+  %179 = call float @llvm.pow.f32(float %178, float %24)
+  %180 = fcmp ult float %132, 0.000000e+00
+  %181 = select i1 %180, float 0.000000e+00, float %179
+  %182 = fadd float %150, %105
+  %183 = fadd float %153, %109
+  %184 = fadd float %156, %113
+  %185 = fmul float %176, %159
+  %186 = fadd float %185, %182
+  %187 = fmul float %176, %162
+  %188 = fadd float %187, %183
+  %189 = fmul float %176, %165
+  %190 = fadd float %189, %184
+  %191 = fmul float %181, %168
+  %192 = fadd float %191, %186
+  %193 = fmul float %181, %171
+  %194 = fadd float %193, %188
+  %195 = fmul float %181, %174
+  %196 = fadd float %195, %190
+  %197 = call float @llvm.AMDIL.clamp.(float %192, float 0.000000e+00, float 1.000000e+00)
+  %198 = call float @llvm.AMDIL.clamp.(float %194, float 0.000000e+00, float 1.000000e+00)
+  %199 = call float @llvm.AMDIL.clamp.(float %196, float 0.000000e+00, float 1.000000e+00)
+  %200 = insertelement <4 x float> undef, float %75, i32 0
+  %201 = insertelement <4 x float> %200, float %79, i32 1
+  %202 = insertelement <4 x float> %201, float %83, i32 2
+  %203 = insertelement <4 x float> %202, float %87, i32 3
+  call void @llvm.R600.store.swizzle(<4 x float> %203, i32 60, i32 1)
+  %204 = insertelement <4 x float> undef, float %197, i32 0
+  %205 = insertelement <4 x float> %204, float %198, i32 1
+  %206 = insertelement <4 x float> %205, float %199, i32 2
+  %207 = insertelement <4 x float> %206, float %117, i32 3
+  call void @llvm.R600.store.swizzle(<4 x float> %207, i32 0, i32 2)
+  ret void
+}
+
+; Function Attrs: readnone
+declare float @llvm.R600.load.input(i32) #1
+
+; Function Attrs: readnone
+declare float @llvm.AMDGPU.dp4(<4 x float>, <4 x float>) #1
+
+; Function Attrs: readonly
+declare float @fabs(float) #2
+
+; Function Attrs: readnone
+declare float @llvm.AMDGPU.rsq(float) #1
+
+; Function Attrs: readnone
+declare float @llvm.AMDIL.clamp.(float, float, float) #1
+
+; Function Attrs: nounwind readonly
+declare float @llvm.pow.f32(float, float) #3
+
+declare void @llvm.R600.store.swizzle(<4 x float>, i32, i32)
+
+attributes #0 = { "ShaderType"="1" }
+attributes #1 = { readnone }
+attributes #2 = { readonly }
+attributes #3 = { nounwind readonly }