Index: lib/Target/X86/X86SchedBroadwell.td
===================================================================
--- lib/Target/X86/X86SchedBroadwell.td
+++ lib/Target/X86/X86SchedBroadwell.td
@@ -212,22 +212,22 @@
 //defm : BWWriteResPair<WriteFDiv,     [BWPort0,BWFPDivider], 11, [1,3], 1, 5>; // Floating point division.
 defm : BWWriteResPair<WriteFDivX,    [BWPort0,BWFPDivider], 11, [1,5], 1, 5>; // Floating point division (XMM).
 defm : BWWriteResPair<WriteFDivY,    [BWPort0,BWPort015,BWFPDivider], 17, [2,1,10], 3, 6>; // Floating point division (YMM).
-defm : BWWriteResPair<WriteFDivZ,    [BWPort0,BWPort015,BWFPDivider], 17, [2,1,10], 3, 6>; // Floating point division (ZMM).
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 //defm : BWWriteResPair<WriteFDiv64,   [BWPort0,BWFPDivider], 14, [1,8], 1, 5>; // Floating point division.
 defm : BWWriteResPair<WriteFDiv64X,  [BWPort0,BWFPDivider], 14, [1,8], 1, 5>; // Floating point division (XMM).
 defm : BWWriteResPair<WriteFDiv64Y,  [BWPort0,BWPort015,BWFPDivider], 23, [2,1,16], 3, 6>; // Floating point division (YMM).
-defm : BWWriteResPair<WriteFDiv64Z,  [BWPort0,BWPort015,BWFPDivider], 23, [2,1,16], 3, 6>; // Floating point division (ZMM).
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 
 defm : X86WriteRes<WriteFSqrt,       [BWPort0,BWFPDivider], 11, [1,4], 1>; // Floating point square root.
 defm : X86WriteRes<WriteFSqrtLd,     [BWPort0,BWPort23,BWFPDivider], 16, [1,1,7], 2>;
 defm : BWWriteResPair<WriteFSqrtX,   [BWPort0,BWFPDivider], 11, [1,7], 1, 5>; // Floating point square root (XMM).
 defm : BWWriteResPair<WriteFSqrtY,   [BWPort0,BWPort015,BWFPDivider], 21, [2,1,14], 3, 6>; // Floating point square root (YMM).
-defm : BWWriteResPair<WriteFSqrtZ,   [BWPort0,BWPort015,BWFPDivider], 21, [2,1,14], 3, 6>; // Floating point square root (ZMM).
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : X86WriteRes<WriteFSqrt64,     [BWPort0,BWFPDivider], 16, [1,8], 1>; // Floating point double square root.
 defm : X86WriteRes<WriteFSqrt64Ld,   [BWPort0,BWPort23,BWFPDivider], 21, [1,1,14], 2>;
 defm : BWWriteResPair<WriteFSqrt64X, [BWPort0,BWFPDivider], 16, [1,14],1, 5>; // Floating point double square root (XMM).
 defm : BWWriteResPair<WriteFSqrt64Y, [BWPort0,BWPort015,BWFPDivider], 29, [2,1,28], 3, 6>; // Floating point double square root (YMM).
-defm : BWWriteResPair<WriteFSqrt64Z, [BWPort0,BWPort015,BWFPDivider], 29, [2,1,28], 3, 6>; // Floating point double square root (ZMM).
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : BWWriteResPair<WriteFSqrt80,  [BWPort0,BWFPDivider], 23, [1,9]>; // Floating point long double square root.
 
 defm : BWWriteResPair<WriteFRcp,   [BWPort0],  5, [1], 1, 5>; // Floating point reciprocal estimate.
@@ -1688,4 +1688,3 @@
 def: InstRW<[WriteZero], (instrs CLC)>;
 
 } // SchedModel
-
Index: lib/Target/X86/X86SchedHaswell.td
===================================================================
--- lib/Target/X86/X86SchedHaswell.td
+++ lib/Target/X86/X86SchedHaswell.td
@@ -10,6 +10,11 @@
 // This file defines the machine model for Haswell to support instruction
 // scheduling and other instruction cost heuristics.
 //
+// Note that we define some instructions here that are not supported by haswell,
+// but we still have to define them because KNL uses the HSW model.
+// They are currently tagged with a comment `Unsupported = 1`.
+// FIXME: Use Unsupported = 1 once KNL has its own model.
+//
 //===----------------------------------------------------------------------===//
 
 def HaswellModel : SchedMachineModel {
@@ -203,11 +208,11 @@
 defm : HWWriteResPair<WriteFDiv,    [HWPort0,HWFPDivider], 13, [1,7], 1, 5>;
 defm : HWWriteResPair<WriteFDivX,   [HWPort0,HWFPDivider], 13, [1,7], 1, 6>;
 defm : HWWriteResPair<WriteFDivY,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>;
-defm : HWWriteResPair<WriteFDivZ,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>;
+defm : HWWriteResPair<WriteFDivZ,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>; // Unsupported = 1
 defm : HWWriteResPair<WriteFDiv64,  [HWPort0,HWFPDivider], 20, [1,14], 1, 5>;
 defm : HWWriteResPair<WriteFDiv64X, [HWPort0,HWFPDivider], 20, [1,14], 1, 6>;
 defm : HWWriteResPair<WriteFDiv64Y, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>;
-defm : HWWriteResPair<WriteFDiv64Z, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>;
+defm : HWWriteResPair<WriteFDiv64Z, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>; // Unsupported = 1
 
 defm : HWWriteResPair<WriteFRcp,   [HWPort0],  5, [1], 1, 5>;
 defm : HWWriteResPair<WriteFRcpX,  [HWPort0],  5, [1], 1, 6>;
@@ -220,11 +225,11 @@
 defm : HWWriteResPair<WriteFSqrt,    [HWPort0,HWFPDivider], 11, [1,7], 1, 5>;
 defm : HWWriteResPair<WriteFSqrtX,   [HWPort0,HWFPDivider], 11, [1,7], 1, 6>;
 defm : HWWriteResPair<WriteFSqrtY,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>;
-defm : HWWriteResPair<WriteFSqrtZ,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>;
+defm : HWWriteResPair<WriteFSqrtZ,   [HWPort0,HWPort15,HWFPDivider], 21, [2,1,14], 3, 7>; // Unsupported = 1
 defm : HWWriteResPair<WriteFSqrt64,  [HWPort0,HWFPDivider], 16, [1,14], 1, 5>;
 defm : HWWriteResPair<WriteFSqrt64X, [HWPort0,HWFPDivider], 16, [1,14], 1, 6>;
 defm : HWWriteResPair<WriteFSqrt64Y, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>;
-defm : HWWriteResPair<WriteFSqrt64Z, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>;
+defm : HWWriteResPair<WriteFSqrt64Z, [HWPort0,HWPort15,HWFPDivider], 35, [2,1,28], 3, 7>; // Unsupported = 1
 defm : HWWriteResPair<WriteFSqrt80,  [HWPort0,HWFPDivider], 23, [1,17]>;
 
 defm : HWWriteResPair<WriteFMA,   [HWPort01], 5, [1], 1, 5>;
Index: lib/Target/X86/X86SchedSandyBridge.td
===================================================================
--- lib/Target/X86/X86SchedSandyBridge.td
+++ lib/Target/X86/X86SchedSandyBridge.td
@@ -10,6 +10,10 @@
 // This file defines the machine model for Sandy Bridge to support instruction
 // scheduling and other instruction cost heuristics.
 //
+// Note that we define some instructions here that are not supported by SNB,
+// but we still have to define them because SNB is the default subtarget for
+// X86. These instructions are tagged with a comment `Unsupported = 1`.
+//
 //===----------------------------------------------------------------------===//
 
 def SandyBridgeModel : SchedMachineModel {
@@ -195,11 +199,11 @@
 defm : SBWriteResPair<WriteFDiv,    [SBPort0,SBFPDivider], 14, [1,14], 1, 6>;
 defm : SBWriteResPair<WriteFDivX,   [SBPort0,SBFPDivider], 14, [1,14], 1, 6>;
 defm : SBWriteResPair<WriteFDivY,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
-defm : SBWriteResPair<WriteFDivZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
+defm : SBWriteResPair<WriteFDivZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>; // Unsupported = 1
 defm : SBWriteResPair<WriteFDiv64,  [SBPort0,SBFPDivider], 22, [1,22], 1, 6>;
 defm : SBWriteResPair<WriteFDiv64X, [SBPort0,SBFPDivider], 22, [1,22], 1, 6>;
 defm : SBWriteResPair<WriteFDiv64Y, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
-defm : SBWriteResPair<WriteFDiv64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
+defm : SBWriteResPair<WriteFDiv64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>; // Unsupported = 1
 
 defm : SBWriteResPair<WriteFRcp,   [SBPort0],  5, [1], 1, 6>;
 defm : SBWriteResPair<WriteFRcpX,  [SBPort0],  5, [1], 1, 6>;
@@ -212,11 +216,11 @@
 defm : SBWriteResPair<WriteFSqrt,    [SBPort0,SBFPDivider], 14, [1,14], 1, 6>;
 defm : SBWriteResPair<WriteFSqrtX,   [SBPort0,SBFPDivider], 14, [1,14], 1, 6>;
 defm : SBWriteResPair<WriteFSqrtY,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
-defm : SBWriteResPair<WriteFSqrtZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
+defm : SBWriteResPair<WriteFSqrtZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>; // Unsupported = 1
 defm : SBWriteResPair<WriteFSqrt64,  [SBPort0,SBFPDivider], 21, [1,21], 1, 6>;
 defm : SBWriteResPair<WriteFSqrt64X, [SBPort0,SBFPDivider], 21, [1,21], 1, 6>;
 defm : SBWriteResPair<WriteFSqrt64Y, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
-defm : SBWriteResPair<WriteFSqrt64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
+defm : SBWriteResPair<WriteFSqrt64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>; // Unsupported = 1
 defm : SBWriteResPair<WriteFSqrt80,  [SBPort0,SBFPDivider], 24, [1,24], 1, 6>;
 
 defm : SBWriteResPair<WriteDPPD,   [SBPort0,SBPort1,SBPort5],  9, [1,1,1], 3, 6>;
Index: lib/Target/X86/X86SchedSkylakeClient.td
===================================================================
--- lib/Target/X86/X86SchedSkylakeClient.td
+++ lib/Target/X86/X86SchedSkylakeClient.td
@@ -208,20 +208,20 @@
 defm : SKLWriteResPair<WriteFDiv,     [SKLPort0,SKLFPDivider], 11, [1,3], 1, 5>; // Floating point division.
 //defm : SKLWriteResPair<WriteFDivX,    [SKLPort0,SKLFPDivider], 11, [1,3], 1, 6>; // Floating point division (XMM).
 defm : SKLWriteResPair<WriteFDivY,    [SKLPort0,SKLFPDivider], 11, [1,5], 1, 7>; // Floating point division (YMM).
-defm : SKLWriteResPair<WriteFDivZ,    [SKLPort0,SKLFPDivider], 11, [1,5], 1, 7>; // Floating point division (ZMM).
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 //defm : SKLWriteResPair<WriteFDiv64,   [SKLPort0,SKLFPDivider], 14, [1,3], 1, 5>; // Floating point double division.
 //defm : SKLWriteResPair<WriteFDiv64X,  [SKLPort0,SKLFPDivider], 14, [1,3], 1, 6>; // Floating point double division (XMM).
 //defm : SKLWriteResPair<WriteFDiv64Y,  [SKLPort0,SKLFPDivider], 14, [1,5], 1, 7>; // Floating point double division (YMM).
-defm : SKLWriteResPair<WriteFDiv64Z,  [SKLPort0,SKLFPDivider], 14, [1,5], 1, 7>; // Floating point double division (ZMM).
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 
 defm : SKLWriteResPair<WriteFSqrt,    [SKLPort0,SKLFPDivider], 12, [1,3], 1, 5>; // Floating point square root.
 defm : SKLWriteResPair<WriteFSqrtX,   [SKLPort0,SKLFPDivider], 12, [1,3], 1, 6>; // Floating point square root (XMM).
 defm : SKLWriteResPair<WriteFSqrtY,   [SKLPort0,SKLFPDivider], 12, [1,6], 1, 7>; // Floating point square root (YMM).
-defm : SKLWriteResPair<WriteFSqrtZ,   [SKLPort0,SKLFPDivider], 12, [1,6], 1, 7>; // Floating point square root (ZMM).
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : SKLWriteResPair<WriteFSqrt64,  [SKLPort0,SKLFPDivider], 18, [1,6], 1, 5>; // Floating point double square root.
 defm : SKLWriteResPair<WriteFSqrt64X, [SKLPort0,SKLFPDivider], 18, [1,6], 1, 6>; // Floating point double square root (XMM).
 defm : SKLWriteResPair<WriteFSqrt64Y, [SKLPort0,SKLFPDivider], 18, [1,12],1, 7>; // Floating point double square root (YMM).
-defm : SKLWriteResPair<WriteFSqrt64Z, [SKLPort0,SKLFPDivider], 18, [1,12],1, 7>; // Floating point double square root (ZMM).
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : SKLWriteResPair<WriteFSqrt80,  [SKLPort0,SKLFPDivider], 21, [1,7]>; // Floating point long double square root.
 
 defm : SKLWriteResPair<WriteFRcp,   [SKLPort0], 4, [1], 1, 5>; // Floating point reciprocal estimate.
Index: lib/Target/X86/X86Schedule.td
===================================================================
--- lib/Target/X86/X86Schedule.td
+++ lib/Target/X86/X86Schedule.td
@@ -49,6 +49,20 @@
   }
 }
 
+// Helpers to mark SchedWrites as unsupported.
+multiclass X86WriteResUnsupported<SchedWrite SchedRW> {
+  let Unsupported = 1 in {
+    def : WriteRes<SchedRW, []>;
+  }
+}
+multiclass X86WriteResPairUnsupported<X86FoldableSchedWrite SchedRW> {
+  let Unsupported = 1 in {
+    def : WriteRes<SchedRW, []>;
+    def : WriteRes<SchedRW.Folded, []>;
+  }
+}
+
+
 // Multiclass that wraps X86FoldableSchedWrite for each vector width.
 class X86SchedWriteWidths<X86FoldableSchedWrite sScl,
                           X86FoldableSchedWrite s128,
@@ -598,4 +612,3 @@
 def GenericPostRAModel : GenericX86Model {
   let PostRAScheduler = 1;
 }
-
Index: lib/Target/X86/X86ScheduleAtom.td
===================================================================
--- lib/Target/X86/X86ScheduleAtom.td
+++ lib/Target/X86/X86ScheduleAtom.td
@@ -90,7 +90,7 @@
 defm : AtomWriteResPair<WriteIDiv32, [AtomPort01], [AtomPort01], 62, 62, [62], [62]>;
 defm : AtomWriteResPair<WriteIDiv64, [AtomPort01], [AtomPort01],130,130,[130],[130]>;
 
-defm : AtomWriteResPair<WriteCRC32, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteCRC32>;
 
 defm : AtomWriteResPair<WriteCMOV,  [AtomPort01], [AtomPort0]>;
 defm : AtomWriteResPair<WriteCMOV2, [AtomPort01], [AtomPort0]>;
@@ -102,7 +102,7 @@
   let ResourceCycles = [2];
 }
 
-def : WriteRes<WriteIMulH, [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResUnsupported<WriteIMulH>;
 
 // This is for simple LEAs with one or two input operands.
 def : WriteRes<WriteLEA, [AtomPort1]>;
@@ -128,13 +128,13 @@
 
 // Bit counts.
 defm : AtomWriteResPair<WriteBitScan, [AtomPort01], [AtomPort01], 16, 16, [16], [16]>;
-defm : AtomWriteResPair<WritePOPCNT,  [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteLZCNT,   [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteTZCNT,   [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WritePOPCNT>;
+defm : X86WriteResPairUnsupported<WriteLZCNT>;
+defm : X86WriteResPairUnsupported<WriteTZCNT>;
 
 // BMI1 BEXTR, BMI2 BZHI
-defm : AtomWriteResPair<WriteBEXTR, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteBZHI,  [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteBEXTR>;
+defm : X86WriteResPairUnsupported<WriteBZHI>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Integer shifts and rotates.
@@ -235,43 +235,43 @@
 defm : AtomWriteResPair<WriteFDiv,          [AtomPort01], [AtomPort01], 34, 34, [34], [34]>;
 defm : AtomWriteResPair<WriteFDivX,         [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
 defm : AtomWriteResPair<WriteFDivY,         [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
-defm : AtomWriteResPair<WriteFDivZ,         [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 defm : AtomWriteResPair<WriteFDiv64,        [AtomPort01], [AtomPort01], 62, 62, [62], [62]>;
 defm : AtomWriteResPair<WriteFDiv64X,       [AtomPort01], [AtomPort01],125,125,[125],[125]>;
 defm : AtomWriteResPair<WriteFDiv64Y,       [AtomPort01], [AtomPort01],125,125,[125],[125]>;
-defm : AtomWriteResPair<WriteFDiv64Z,       [AtomPort01], [AtomPort01],125,125,[125],[125]>;
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 defm : AtomWriteResPair<WriteFSqrt,         [AtomPort01], [AtomPort01], 34, 34, [34], [34]>;
 defm : AtomWriteResPair<WriteFSqrtX,        [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
 defm : AtomWriteResPair<WriteFSqrtY,        [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
-defm : AtomWriteResPair<WriteFSqrtZ,        [AtomPort01], [AtomPort01], 70, 70, [70], [70]>;
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : AtomWriteResPair<WriteFSqrt64,       [AtomPort01], [AtomPort01], 62, 62, [62], [62]>;
 defm : AtomWriteResPair<WriteFSqrt64X,      [AtomPort01], [AtomPort01],125,125,[125],[125]>;
 defm : AtomWriteResPair<WriteFSqrt64Y,      [AtomPort01], [AtomPort01],125,125,[125],[125]>;
-defm : AtomWriteResPair<WriteFSqrt64Z,      [AtomPort01], [AtomPort01],125,125,[125],[125]>;
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : AtomWriteResPair<WriteFSqrt80,       [AtomPort01], [AtomPort01], 71, 71, [71], [71]>;
 defm : AtomWriteResPair<WriteFSign,          [AtomPort1],  [AtomPort1]>;
 defm : AtomWriteResPair<WriteFRnd,           [AtomPort0],  [AtomPort0],  5,  5,  [5],  [5]>;
 defm : AtomWriteResPair<WriteFRndY,          [AtomPort0],  [AtomPort0],  5,  5,  [5],  [5]>;
 defm : AtomWriteResPair<WriteFLogic,        [AtomPort01],  [AtomPort0]>;
-defm : AtomWriteResPair<WriteFLogicY,       [AtomPort01],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteFLogicY>;
 defm : AtomWriteResPair<WriteFTest,         [AtomPort01],  [AtomPort0]>;
-defm : AtomWriteResPair<WriteFTestY ,       [AtomPort01],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteFTestY>;
 defm : AtomWriteResPair<WriteFShuffle,       [AtomPort0],  [AtomPort0]>;
-defm : AtomWriteResPair<WriteFShuffleY,      [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFVarShuffle,    [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFVarShuffleY,   [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFMA,            [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFMAX,           [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFMAY,           [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteDPPD,           [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteDPPS,           [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteDPPSY,          [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFBlend,         [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFBlendY,        [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFVarBlend,      [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFVarBlendY,     [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFShuffle256,    [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteFVarShuffle256, [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteFShuffleY>;
+defm : X86WriteResPairUnsupported<WriteFVarShuffle>;
+defm : X86WriteResPairUnsupported<WriteFVarShuffleY>;
+defm : X86WriteResPairUnsupported<WriteFMA>;
+defm : X86WriteResPairUnsupported<WriteFMAX>;
+defm : X86WriteResPairUnsupported<WriteFMAY>;
+defm : X86WriteResPairUnsupported<WriteDPPD>;
+defm : X86WriteResPairUnsupported<WriteDPPS>;
+defm : X86WriteResPairUnsupported<WriteDPPSY>;
+defm : X86WriteResPairUnsupported<WriteFBlend>;
+defm : X86WriteResPairUnsupported<WriteFBlendY>;
+defm : X86WriteResPairUnsupported<WriteFVarBlend>;
+defm : X86WriteResPairUnsupported<WriteFVarBlendY>;
+defm : X86WriteResPairUnsupported<WriteFShuffle256>;
+defm : X86WriteResPairUnsupported<WriteFVarShuffle256>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Conversions.
@@ -298,12 +298,12 @@
 defm : AtomWriteResPair<WriteCvtPD2PS,  [AtomPort01], [AtomPort01], 7, 8, [7], [8]>;
 defm : AtomWriteResPair<WriteCvtPD2PSY, [AtomPort01], [AtomPort01], 7, 8, [7], [8]>;
 
-defm : AtomWriteResPair<WriteCvtPH2PS,  [AtomPort0], [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteCvtPH2PSY, [AtomPort0], [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-def  : WriteRes<WriteCvtPS2PH,          [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-def  : WriteRes<WriteCvtPS2PHY,         [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-def  : WriteRes<WriteCvtPS2PHSt,        [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-def  : WriteRes<WriteCvtPS2PHYSt,       [AtomPort0]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteCvtPH2PS>;
+defm : X86WriteResPairUnsupported<WriteCvtPH2PSY>;
+defm : X86WriteResUnsupported<WriteCvtPS2PH>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHSt>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHY>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHYSt>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Vector integer operations.
@@ -362,14 +362,14 @@
 defm : AtomWriteResPair<WriteVarShuffle,    [AtomPort0],  [AtomPort0], 1, 1>;
 defm : AtomWriteResPair<WriteVarShuffleX,  [AtomPort01], [AtomPort01], 4, 5, [4], [5]>;
 defm : AtomWriteResPair<WriteVarShuffleY,  [AtomPort01], [AtomPort01], 4, 5, [4], [5]>;
-defm : AtomWriteResPair<WriteBlend,         [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteBlendY,        [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteVarBlend,      [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteVarBlendY,     [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteShuffle256,    [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteVarShuffle256, [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteVarVecShift,   [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteVarVecShiftY,  [AtomPort0],  [AtomPort0]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteBlend>;
+defm : X86WriteResPairUnsupported<WriteBlendY>;
+defm : X86WriteResPairUnsupported<WriteVarBlend>;
+defm : X86WriteResPairUnsupported<WriteVarBlendY>;
+defm : X86WriteResPairUnsupported<WriteShuffle256>;
+defm : X86WriteResPairUnsupported<WriteVarShuffle256>;
+defm : X86WriteResPairUnsupported<WriteVarVecShift>;
+defm : X86WriteResPairUnsupported<WriteVarVecShiftY>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Vector insert/extract operations.
@@ -383,10 +383,10 @@
 // SSE42 String instructions.
 ////////////////////////////////////////////////////////////////////////////////
 
-defm : AtomWriteResPair<WritePCmpIStrI, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WritePCmpIStrM, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WritePCmpEStrI, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WritePCmpEStrM, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WritePCmpIStrI>;
+defm : X86WriteResPairUnsupported<WritePCmpIStrM>;
+defm : X86WriteResPairUnsupported<WritePCmpEStrI>;
+defm : X86WriteResPairUnsupported<WritePCmpEStrM>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // MOVMSK Instructions.
@@ -398,12 +398,12 @@
 def : WriteRes<WriteMMXMOVMSK,  [AtomPort0]> { let Latency = 3; let ResourceCycles = [3]; }
 
 ////////////////////////////////////////////////////////////////////////////////
-// AES Instructions.
+// AES instructions.
 ////////////////////////////////////////////////////////////////////////////////
 
-defm : AtomWriteResPair<WriteAESIMC,    [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteAESKeyGen, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
-defm : AtomWriteResPair<WriteAESDecEnc, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteAESIMC>;
+defm : X86WriteResPairUnsupported<WriteAESKeyGen>;
+defm : X86WriteResPairUnsupported<WriteAESDecEnc>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Horizontal add/sub  instructions.
@@ -419,7 +419,7 @@
 // Carry-less multiplication instructions.
 ////////////////////////////////////////////////////////////////////////////////
 
-defm : AtomWriteResPair<WriteCLMul, [AtomPort01], [AtomPort01]>; // NOTE: Doesn't exist on Atom.
+defm : X86WriteResPairUnsupported<WriteCLMul>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Load/store MXCSR.
Index: lib/Target/X86/X86ScheduleBtVer2.td
===================================================================
--- lib/Target/X86/X86ScheduleBtVer2.td
+++ lib/Target/X86/X86ScheduleBtVer2.td
@@ -190,7 +190,7 @@
 
 // BMI1 BEXTR, BMI2 BZHI
 defm : JWriteResIntPair<WriteBEXTR, [JALU01], 1>;
-defm : JWriteResIntPair<WriteBZHI, [JALU01], 1>; // NOTE: Doesn't exist on Jaguar.
+defm : X86WriteResPairUnsupported<WriteBZHI>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Integer shifts and rotates.
@@ -314,9 +314,9 @@
 defm : JWriteResFpuPair<WriteFMul64,       [JFPU1, JFPM],  4, [1,2]>;
 defm : JWriteResFpuPair<WriteFMul64X,      [JFPU1, JFPM],  4, [1,2]>;
 defm : JWriteResYMMPair<WriteFMul64Y,      [JFPU1, JFPM],  4, [2,4], 2>;
-defm : JWriteResFpuPair<WriteFMA,          [JFPU1, JFPM],  2>; // NOTE: Doesn't exist on Jaguar.
-defm : JWriteResFpuPair<WriteFMAX,         [JFPU1, JFPM],  2>; // NOTE: Doesn't exist on Jaguar.
-defm : JWriteResFpuPair<WriteFMAY,         [JFPU1, JFPM],  2>; // NOTE: Doesn't exist on Jaguar.
+defm : X86WriteResPairUnsupported<WriteFMA>;
+defm : X86WriteResPairUnsupported<WriteFMAX>;
+defm : X86WriteResPairUnsupported<WriteFMAY>;
 defm : JWriteResFpuPair<WriteDPPD,   [JFPU1, JFPM, JFPA],  9, [1, 3, 3],  3>;
 defm : JWriteResFpuPair<WriteDPPS,   [JFPU1, JFPM, JFPA], 11, [1, 3, 3],  5>;
 defm : JWriteResYMMPair<WriteDPPSY,  [JFPU1, JFPM, JFPA], 12, [2, 6, 6], 10>;
@@ -329,19 +329,19 @@
 defm : JWriteResFpuPair<WriteFDiv,         [JFPU1, JFPM], 19, [1, 19]>;
 defm : JWriteResFpuPair<WriteFDivX,        [JFPU1, JFPM], 19, [1, 19]>;
 defm : JWriteResYMMPair<WriteFDivY,        [JFPU1, JFPM], 38, [2, 38], 2>;
-defm : JWriteResYMMPair<WriteFDivZ,        [JFPU1, JFPM], 38, [2, 38], 2>;
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 defm : JWriteResFpuPair<WriteFDiv64,       [JFPU1, JFPM], 19, [1, 19]>;
 defm : JWriteResFpuPair<WriteFDiv64X,      [JFPU1, JFPM], 19, [1, 19]>;
 defm : JWriteResYMMPair<WriteFDiv64Y,      [JFPU1, JFPM], 38, [2, 38], 2>;
-defm : JWriteResYMMPair<WriteFDiv64Z,      [JFPU1, JFPM], 38, [2, 38], 2>;
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 defm : JWriteResFpuPair<WriteFSqrt,        [JFPU1, JFPM], 21, [1, 21]>;
 defm : JWriteResFpuPair<WriteFSqrtX,       [JFPU1, JFPM], 21, [1, 21]>;
 defm : JWriteResYMMPair<WriteFSqrtY,       [JFPU1, JFPM], 42, [2, 42], 2>;
-defm : JWriteResYMMPair<WriteFSqrtZ,       [JFPU1, JFPM], 42, [2, 42], 2>;
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : JWriteResFpuPair<WriteFSqrt64,      [JFPU1, JFPM], 27, [1, 27]>;
 defm : JWriteResFpuPair<WriteFSqrt64X,     [JFPU1, JFPM], 27, [1, 27]>;
 defm : JWriteResYMMPair<WriteFSqrt64Y,     [JFPU1, JFPM], 54, [2, 54], 2>;
-defm : JWriteResYMMPair<WriteFSqrt64Z,     [JFPU1, JFPM], 54, [2, 54], 2>;
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : JWriteResFpuPair<WriteFSqrt80,      [JFPU1, JFPM], 35, [1, 35]>;
 defm : JWriteResFpuPair<WriteFSign,        [JFPU1, JFPM],  2>;
 defm : JWriteResFpuPair<WriteFRnd,         [JFPU1, JSTC],  3>;
@@ -359,7 +359,7 @@
 defm : JWriteResFpuPair<WriteFVarBlend,   [JFPU01, JFPX],  2, [1, 4], 3>;
 defm : JWriteResYMMPair<WriteFVarBlendY,  [JFPU01, JFPX],  3, [2, 6], 6>;
 defm : JWriteResFpuPair<WriteFShuffle256, [JFPU01, JFPX],  1>;
-defm : JWriteResFpuPair<WriteFVarShuffle256, [JFPU01, JFPX],  1>; // NOTE: Doesn't exist on Jaguar.
+defm : X86WriteResPairUnsupported<WriteFVarShuffle256>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Conversions.
@@ -454,13 +454,13 @@
 defm : JWriteResFpuPair<WriteVarBlendY,   [JFPU01, JVALU], 2, [1, 4], 3>;
 defm : JWriteResFpuPair<WriteVecLogic,    [JFPU01, JVALU], 1>;
 defm : JWriteResFpuPair<WriteVecLogicX,   [JFPU01, JVALU], 1>;
-defm : JWriteResFpuPair<WriteVecLogicY,   [JFPU01, JVALU], 1>; // NOTE: Doesn't exist on Jaguar.
+defm : X86WriteResPairUnsupported<WriteVecLogicY>;
 defm : JWriteResFpuPair<WriteVecTest,     [JFPU0, JFPA, JALU0], 3>;
 defm : JWriteResYMMPair<WriteVecTestY ,   [JFPU01, JFPX, JFPA, JALU0], 4, [2, 2, 2, 1], 3>;
 defm : JWriteResFpuPair<WriteShuffle256,  [JFPU01, JVALU], 1>;
-defm : JWriteResFpuPair<WriteVarShuffle256, [JFPU01, JVALU], 1>; // NOTE: Doesn't exist on Jaguar.
-defm : JWriteResFpuPair<WriteVarVecShift, [JFPU01, JVALU], 1>; // NOTE: Doesn't exist on Jaguar.
-defm : JWriteResFpuPair<WriteVarVecShiftY,[JFPU01, JVALU], 1>; // NOTE: Doesn't exist on Jaguar.
+defm : X86WriteResPairUnsupported<WriteVarShuffle256>;
+defm : X86WriteResPairUnsupported<WriteVarVecShift>;
+defm : X86WriteResPairUnsupported<WriteVarVecShiftY>;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Vector insert/extract operations.
Index: lib/Target/X86/X86ScheduleSLM.td
===================================================================
--- lib/Target/X86/X86ScheduleSLM.td
+++ lib/Target/X86/X86ScheduleSLM.td
@@ -122,9 +122,8 @@
 defm : SLMWriteResPair<WritePOPCNT,  [SLM_IEC_RSV0], 3>;
 
 // BMI1 BEXTR, BMI2 BZHI
-// NOTE: These don't exist on Silvermont. Ports are guesses.
-defm : SLMWriteResPair<WriteBEXTR, [SLM_IEC_RSV0], 1>;
-defm : SLMWriteResPair<WriteBZHI, [SLM_IEC_RSV0], 1>;
+defm : X86WriteResPairUnsupported<WriteBEXTR>;
+defm : X86WriteResPairUnsupported<WriteBZHI>;
 
 defm : SLMWriteResPair<WriteDiv8,   [SLM_IEC_RSV01, SLMDivider], 25, [1,25], 1, 4>;
 defm : SLMWriteResPair<WriteDiv16,  [SLM_IEC_RSV01, SLMDivider], 25, [1,25], 1, 4>;
@@ -179,11 +178,11 @@
 defm : SLMWriteResPair<WriteFDiv,     [SLM_FPC_RSV0, SLMFPDivider], 19, [1,17]>;
 defm : SLMWriteResPair<WriteFDivX,    [SLM_FPC_RSV0, SLMFPDivider], 39, [1,39]>;
 defm : SLMWriteResPair<WriteFDivY,    [SLM_FPC_RSV0, SLMFPDivider], 39, [1,39]>;
-defm : SLMWriteResPair<WriteFDivZ,    [SLM_FPC_RSV0, SLMFPDivider], 39, [1,39]>;
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 defm : SLMWriteResPair<WriteFDiv64,   [SLM_FPC_RSV0, SLMFPDivider], 34, [1,32]>;
 defm : SLMWriteResPair<WriteFDiv64X,  [SLM_FPC_RSV0, SLMFPDivider], 69, [1,69]>;
 defm : SLMWriteResPair<WriteFDiv64Y,  [SLM_FPC_RSV0, SLMFPDivider], 69, [1,69]>;
-defm : SLMWriteResPair<WriteFDiv64Z,  [SLM_FPC_RSV0, SLMFPDivider], 69, [1,69]>;
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 defm : SLMWriteResPair<WriteFRcp,     [SLM_FPC_RSV0], 5>;
 defm : SLMWriteResPair<WriteFRcpX,    [SLM_FPC_RSV0], 5>;
 defm : SLMWriteResPair<WriteFRcpY,    [SLM_FPC_RSV0], 5>;
@@ -193,11 +192,11 @@
 defm : SLMWriteResPair<WriteFSqrt,    [SLM_FPC_RSV0,SLMFPDivider], 20, [1,20], 1, 3>;
 defm : SLMWriteResPair<WriteFSqrtX,   [SLM_FPC_RSV0,SLMFPDivider], 41, [1,40], 1, 3>;
 defm : SLMWriteResPair<WriteFSqrtY,   [SLM_FPC_RSV0,SLMFPDivider], 41, [1,40], 1, 3>;
-defm : SLMWriteResPair<WriteFSqrtZ,   [SLM_FPC_RSV0,SLMFPDivider], 41, [1,40], 1, 3>;
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : SLMWriteResPair<WriteFSqrt64,  [SLM_FPC_RSV0,SLMFPDivider], 35, [1,35], 1, 3>;
 defm : SLMWriteResPair<WriteFSqrt64X, [SLM_FPC_RSV0,SLMFPDivider], 71, [1,70], 1, 3>;
 defm : SLMWriteResPair<WriteFSqrt64Y, [SLM_FPC_RSV0,SLMFPDivider], 71, [1,70], 1, 3>;
-defm : SLMWriteResPair<WriteFSqrt64Z, [SLM_FPC_RSV0,SLMFPDivider], 71, [1,70], 1, 3>;
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : SLMWriteResPair<WriteFSqrt80,  [SLM_FPC_RSV0,SLMFPDivider], 40, [1,40]>;
 defm : SLMWriteResPair<WriteDPPD,   [SLM_FPC_RSV1], 3>;
 defm : SLMWriteResPair<WriteDPPS,   [SLM_FPC_RSV1], 3>;
@@ -407,26 +406,26 @@
 // AVX/FMA is not supported on that architecture, but we should define the basic
 // scheduling resources anyway.
 def  : WriteRes<WriteIMulH, [SLM_FPC_RSV0]>;
-defm : SLMWriteResPair<WriteFBlendY, [SLM_FPC_RSV0],  1>;
+defm : X86WriteResPairUnsupported<WriteFBlendY>;
 defm : SLMWriteResPair<WriteVarBlend, [SLM_FPC_RSV0], 1>;
-defm : SLMWriteResPair<WriteVarBlendY,[SLM_FPC_RSV0], 1>;
+defm : X86WriteResPairUnsupported<WriteVarBlendY>;
 defm : SLMWriteResPair<WriteFVarBlend, [SLM_FPC_RSV0], 1>;
-defm : SLMWriteResPair<WriteFVarBlendY, [SLM_FPC_RSV0], 1>;
-defm : SLMWriteResPair<WriteFShuffle256, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteFVarShuffle256, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteShuffle256, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteVarShuffle256, [SLM_FPC_RSV0],  1>;
+defm : X86WriteResPairUnsupported<WriteFVarBlendY>;
+defm : X86WriteResPairUnsupported<WriteFShuffle256>;
+defm : X86WriteResPairUnsupported<WriteFVarShuffle256>;
+defm : X86WriteResPairUnsupported<WriteShuffle256>;
+defm : X86WriteResPairUnsupported<WriteVarShuffle256>;
 defm : SLMWriteResPair<WriteVarVecShift,  [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteVarVecShiftY, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteFMA, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteFMAX, [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteFMAY, [SLM_FPC_RSV0],  1>;
-
-defm : SLMWriteResPair<WriteCvtPH2PS,  [SLM_FPC_RSV0],  1>;
-defm : SLMWriteResPair<WriteCvtPH2PSY, [SLM_FPC_RSV0],  1>;
-def  : WriteRes<WriteCvtPS2PH,    [SLM_FPC_RSV0]>;
-def  : WriteRes<WriteCvtPS2PHY,   [SLM_FPC_RSV0]>;
-def  : WriteRes<WriteCvtPS2PHSt,  [SLM_FPC_RSV0]>;
-def  : WriteRes<WriteCvtPS2PHYSt, [SLM_FPC_RSV0]>;
+defm : X86WriteResPairUnsupported<WriteVarVecShiftY>;
+defm : X86WriteResPairUnsupported<WriteFMA>;
+defm : X86WriteResPairUnsupported<WriteFMAX>;
+defm : X86WriteResPairUnsupported<WriteFMAY>;
+
+defm : X86WriteResPairUnsupported<WriteCvtPH2PS>;
+defm : X86WriteResPairUnsupported<WriteCvtPH2PSY>;
+defm : X86WriteResUnsupported<WriteCvtPS2PH>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHY>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHSt>;
+defm : X86WriteResUnsupported<WriteCvtPS2PHYSt>;
 
 } // SchedModel
Index: lib/Target/X86/X86ScheduleZnver1.td
===================================================================
--- lib/Target/X86/X86ScheduleZnver1.td
+++ lib/Target/X86/X86ScheduleZnver1.td
@@ -243,11 +243,11 @@
 defm : ZnWriteResFpuPair<WriteFDiv,      [ZnFPU3], 15>;
 defm : ZnWriteResFpuPair<WriteFDivX,     [ZnFPU3], 15>;
 //defm : ZnWriteResFpuPair<WriteFDivY,     [ZnFPU3], 15>;
-defm : ZnWriteResFpuPair<WriteFDivZ,     [ZnFPU3], 15>;
+defm : X86WriteResPairUnsupported<WriteFDivZ>;
 defm : ZnWriteResFpuPair<WriteFDiv64,    [ZnFPU3], 15>;
 defm : ZnWriteResFpuPair<WriteFDiv64X,   [ZnFPU3], 15>;
 //defm : ZnWriteResFpuPair<WriteFDiv64Y,   [ZnFPU3], 15>;
-defm : ZnWriteResFpuPair<WriteFDiv64Z,   [ZnFPU3], 15>;
+defm : X86WriteResPairUnsupported<WriteFDiv64Z>;
 defm : ZnWriteResFpuPair<WriteFSign,     [ZnFPU3],  2>;
 defm : ZnWriteResFpuPair<WriteFRnd,      [ZnFPU3],  4, [1], 1, 7, 1>; // FIXME: Should folds require 1 extra uops?
 defm : ZnWriteResFpuPair<WriteFRndY,     [ZnFPU3],  4, [1], 1, 7, 1>; // FIXME: Should folds require 1 extra uops?
@@ -277,11 +277,11 @@
 defm : ZnWriteResFpuPair<WriteFSqrt,     [ZnFPU3], 20, [20]>;
 defm : ZnWriteResFpuPair<WriteFSqrtX,    [ZnFPU3], 20, [20]>;
 defm : ZnWriteResFpuPair<WriteFSqrtY,    [ZnFPU3], 28, [28], 1, 7, 1>;
-defm : ZnWriteResFpuPair<WriteFSqrtZ,    [ZnFPU3], 28, [28], 1, 7, 1>;
+defm : X86WriteResPairUnsupported<WriteFSqrtZ>;
 defm : ZnWriteResFpuPair<WriteFSqrt64,   [ZnFPU3], 20, [20]>;
 defm : ZnWriteResFpuPair<WriteFSqrt64X,  [ZnFPU3], 20, [20]>;
 defm : ZnWriteResFpuPair<WriteFSqrt64Y,  [ZnFPU3], 40, [40], 1, 7, 1>;
-defm : ZnWriteResFpuPair<WriteFSqrt64Z,  [ZnFPU3], 40, [40], 1, 7, 1>;
+defm : X86WriteResPairUnsupported<WriteFSqrt64Z>;
 defm : ZnWriteResFpuPair<WriteFSqrt80,   [ZnFPU3], 20, [20]>;
 
 // Vector integer operations which uses FPU units