Index: lib/Target/X86/X86SchedBroadwell.td
===================================================================
--- lib/Target/X86/X86SchedBroadwell.td
+++ lib/Target/X86/X86SchedBroadwell.td
@@ -105,6 +105,14 @@
 // 2/3/7 cycle to recompute the address.
 def : WriteRes<WriteRMW, [BWPort237,BWPort4]>;
 
+// Unsupported.
+let Unsupported = 1 in {
+defm : BWWriteResPair<WriteFDiv64Z, [], 0>;
+defm : BWWriteResPair<WriteFDivZ, [], 0>;
+defm : BWWriteResPair<WriteFSqrtZ, [], 0>;
+defm : BWWriteResPair<WriteFSqrt64Z, [], 0>;
+}  // Unsupported
+
 // Arithmetic.
 defm : BWWriteResPair<WriteALU,    [BWPort0156], 1>; // Simple integer ALU op.
 defm : BWWriteResPair<WriteADC,    [BWPort06], 1>; // Integer ALU + flags op.
@@ -212,22 +220,18 @@
 //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 : 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 : 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 : 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 : 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 +1692,3 @@
 def: InstRW<[WriteZero], (instrs CLC)>;
 
 } // SchedModel
-
Index: lib/Target/X86/X86SchedHaswell.td
===================================================================
--- lib/Target/X86/X86SchedHaswell.td
+++ lib/Target/X86/X86SchedHaswell.td
@@ -136,6 +136,14 @@
 // the port to read all inputs. We don't model that.
 def : WriteRes<WriteLEA, [HWPort15]>;
 
+// Unsupported.
+let Unsupported = 1 in {
+defm : HWWriteResPair<WriteFDiv64Z, [], 0>;
+defm : HWWriteResPair<WriteFDivZ, [], 0>;
+defm : HWWriteResPair<WriteFSqrt64Z, [], 0>;
+defm : HWWriteResPair<WriteFSqrtZ, [], 0>;
+}  // Unsupported
+
 // Bit counts.
 defm : HWWriteResPair<WriteBitScan, [HWPort1], 3>;
 defm : HWWriteResPair<WriteLZCNT,   [HWPort1], 3>;
@@ -203,11 +211,9 @@
 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<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<WriteFRcp,   [HWPort0],  5, [1], 1, 5>;
 defm : HWWriteResPair<WriteFRcpX,  [HWPort0],  5, [1], 1, 6>;
@@ -220,11 +226,9 @@
 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<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<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
@@ -96,6 +96,14 @@
 // 2/3 cycle to recompute the address.
 def : WriteRes<WriteRMW, [SBPort23,SBPort4]>;
 
+// The following classes are for instruction that are not supported by SNB, but
+// we still have to define them because SNB is the default subtarget for X86.
+defm : SBWriteResPair<WriteFDiv64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
+defm : SBWriteResPair<WriteFDivZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
+defm : SBWriteResPair<WriteFSqrt64Z, [SBPort0,SBPort05,SBFPDivider], 45, [2,1,44], 3, 7>;
+defm : SBWriteResPair<WriteFSqrtZ,   [SBPort0,SBPort05,SBFPDivider], 29, [2,1,28], 3, 7>;
+
+
 def : WriteRes<WriteStore,   [SBPort23, SBPort4]>;
 def : WriteRes<WriteStoreNT, [SBPort23, SBPort4]>;
 def : WriteRes<WriteLoad,    [SBPort23]> { let Latency = 5; }
@@ -195,11 +203,9 @@
 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<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<WriteFRcp,   [SBPort0],  5, [1], 1, 6>;
 defm : SBWriteResPair<WriteFRcpX,  [SBPort0],  5, [1], 1, 6>;
@@ -212,11 +218,9 @@
 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<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<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
@@ -104,6 +104,14 @@
 // 2/3/7 cycle to recompute the address.
 def : WriteRes<WriteRMW, [SKLPort237,SKLPort4]>;
 
+// Unsupported.
+let Unsupported = 1 in {
+defm : SKLWriteResPair<WriteFDiv64Z, [], 0>;
+defm : SKLWriteResPair<WriteFDivZ, [], 0>;
+defm : SKLWriteResPair<WriteFSqrt64Z, [], 0>;
+defm : SKLWriteResPair<WriteFSqrtZ, [], 0>;
+}  // Unsupported
+
 // Arithmetic.
 defm : SKLWriteResPair<WriteALU,    [SKLPort0156], 1>; // Simple integer ALU op.
 defm : SKLWriteResPair<WriteADC,    [SKLPort06],   1>; // Integer ALU + flags op.
@@ -208,20 +216,16 @@
 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 : 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 : 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 : 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 : 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/X86ScheduleAtom.td
===================================================================
--- lib/Target/X86/X86ScheduleAtom.td
+++ lib/Target/X86/X86ScheduleAtom.td
@@ -72,6 +72,17 @@
 // A folded store needs a cycle on Port0 for the store data.
 def : WriteRes<WriteRMW, [AtomPort0]>;
 
+////////////////////////////////////////////////////////////////////////////////
+// Unsupported.
+////////////////////////////////////////////////////////////////////////////////
+
+let Unsupported = 1 in {
+defm : AtomWriteResPair<WriteFDiv64Z, [], []>;
+defm : AtomWriteResPair<WriteFDivZ, [], []>;
+defm : AtomWriteResPair<WriteFSqrt64Z, [], []>;
+defm : AtomWriteResPair<WriteFSqrtZ, [], []>;
+}  // Unsupported
+
 ////////////////////////////////////////////////////////////////////////////////
 // Arithmetic.
 ////////////////////////////////////////////////////////////////////////////////
@@ -235,19 +246,15 @@
 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 : 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 : 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 : 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 : AtomWriteResPair<WriteFSqrt80,       [AtomPort01], [AtomPort01], 71, 71, [71], [71]>;
 defm : AtomWriteResPair<WriteFSign,          [AtomPort1],  [AtomPort1]>;
 defm : AtomWriteResPair<WriteFRnd,           [AtomPort0],  [AtomPort0],  5,  5,  [5],  [5]>;
Index: lib/Target/X86/X86ScheduleBtVer2.td
===================================================================
--- lib/Target/X86/X86ScheduleBtVer2.td
+++ lib/Target/X86/X86ScheduleBtVer2.td
@@ -151,6 +151,17 @@
 // A folded store needs a cycle on the SAGU for the store data.
 def : WriteRes<WriteRMW, [JSAGU]>;
 
+////////////////////////////////////////////////////////////////////////////////
+// Unsupported.
+////////////////////////////////////////////////////////////////////////////////
+
+let Unsupported = 1 in {
+defm : JWriteResIntPair<WriteFDiv64Z, [], 0>;
+defm : JWriteResIntPair<WriteFDivZ, [], 0>;
+defm : JWriteResIntPair<WriteFSqrt64Z, [], 0>;
+defm : JWriteResIntPair<WriteFSqrtZ, [], 0>;
+}  // Unsupported
+
 ////////////////////////////////////////////////////////////////////////////////
 // Arithmetic.
 ////////////////////////////////////////////////////////////////////////////////
@@ -329,19 +340,15 @@
 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 : 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 : 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 : 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 : JWriteResFpuPair<WriteFSqrt80,      [JFPU1, JFPM], 35, [1, 35]>;
 defm : JWriteResFpuPair<WriteFSign,        [JFPU1, JFPM],  2>;
 defm : JWriteResFpuPair<WriteFRnd,         [JFPU1, JSTC],  3>;
@@ -547,4 +554,3 @@
 }
 def : InstRW<[JWriteJVZEROUPPER], (instrs VZEROUPPER)>;
 } // SchedModel
-
Index: lib/Target/X86/X86ScheduleSLM.td
===================================================================
--- lib/Target/X86/X86ScheduleSLM.td
+++ lib/Target/X86/X86ScheduleSLM.td
@@ -75,6 +75,13 @@
   }
 }
 
+let Unsupported = 1 in {
+defm : SLMWriteResPair<WriteFDiv64Z, [], 0>;
+defm : SLMWriteResPair<WriteFDivZ, [], 0>;
+defm : SLMWriteResPair<WriteFSqrt64Z, [], 0>;
+defm : SLMWriteResPair<WriteFSqrtZ, [], 0>;
+}  // Unsupported
+
 // A folded store needs a cycle on MEC_RSV for the store data, but it does not
 // need an extra port cycle to recompute the address.
 def : WriteRes<WriteRMW, [SLM_MEC_RSV]>;
@@ -179,11 +186,9 @@
 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 : 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 : SLMWriteResPair<WriteFRcp,     [SLM_FPC_RSV0], 5>;
 defm : SLMWriteResPair<WriteFRcpX,    [SLM_FPC_RSV0], 5>;
 defm : SLMWriteResPair<WriteFRcpY,    [SLM_FPC_RSV0], 5>;
@@ -193,11 +198,9 @@
 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 : 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 : SLMWriteResPair<WriteFSqrt80,  [SLM_FPC_RSV0,SLMFPDivider], 40, [1,40]>;
 defm : SLMWriteResPair<WriteDPPD,   [SLM_FPC_RSV1], 3>;
 defm : SLMWriteResPair<WriteDPPS,   [SLM_FPC_RSV1], 3>;
Index: lib/Target/X86/X86ScheduleZnver1.td
===================================================================
--- lib/Target/X86/X86ScheduleZnver1.td
+++ lib/Target/X86/X86ScheduleZnver1.td
@@ -139,6 +139,13 @@
   }
 }
 
+let Unsupported = 1 in {
+defm : ZnWriteResPair<WriteFDiv64Z, [], 0>;
+defm : ZnWriteResPair<WriteFDivZ, [], 0>;
+defm : ZnWriteResPair<WriteFSqrt64Z, [], 0>;
+defm : ZnWriteResPair<WriteFSqrtZ, [], 0>;
+}  // Unsupported
+
 // WriteRMW is set for instructions with Memory write
 // operation in codegen
 def : WriteRes<WriteRMW, [ZnAGU]>;
@@ -243,11 +250,9 @@
 defm : ZnWriteResFpuPair<WriteFDiv,      [ZnFPU3], 15>;
 defm : ZnWriteResFpuPair<WriteFDivX,     [ZnFPU3], 15>;
 //defm : ZnWriteResFpuPair<WriteFDivY,     [ZnFPU3], 15>;
-defm : ZnWriteResFpuPair<WriteFDivZ,     [ZnFPU3], 15>;
 defm : ZnWriteResFpuPair<WriteFDiv64,    [ZnFPU3], 15>;
 defm : ZnWriteResFpuPair<WriteFDiv64X,   [ZnFPU3], 15>;
 //defm : ZnWriteResFpuPair<WriteFDiv64Y,   [ZnFPU3], 15>;
-defm : ZnWriteResFpuPair<WriteFDiv64Z,   [ZnFPU3], 15>;
 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 +282,9 @@
 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 : 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 : ZnWriteResFpuPair<WriteFSqrt80,   [ZnFPU3], 20, [20]>;
 
 // Vector integer operations which uses FPU units
Index: test/CodeGen/X86/recip-fastmath.ll
===================================================================
--- test/CodeGen/X86/recip-fastmath.ll
+++ test/CodeGen/X86/recip-fastmath.ll
@@ -895,7 +895,7 @@
 ; KNL-LABEL: v16f32_no_estimate:
 ; KNL:       # %bb.0:
 ; KNL-NEXT:    vbroadcastss {{.*#+}} zmm1 = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1] sched: [10:1.00]
-; KNL-NEXT:    vdivps %zmm0, %zmm1, %zmm0 # sched: [21:14.00]
+; KNL-NEXT:    vdivps %zmm0, %zmm1, %zmm0 # sched: [0:?]
 ; KNL-NEXT:    retq # sched: [7:1.00]
 ;
 ; SKX-LABEL: v16f32_no_estimate: