Index: include/llvm/Target/Target.td
===================================================================
--- include/llvm/Target/Target.td
+++ include/llvm/Target/Target.td
@@ -1553,3 +1553,8 @@
 // Pull in the common support for the Global ISel DAG-based selector generation.
 //
 include "llvm/Target/GlobalISel/SelectionDAGCompat.td"
+
+//===----------------------------------------------------------------------===//
+// Pull in the common support for exegesis.
+//
+include "llvm/Target/TargetExegesis.td"
Index: include/llvm/Target/TargetExegesis.td
===================================================================
--- /dev/null
+++ include/llvm/Target/TargetExegesis.td
@@ -0,0 +1,59 @@
+//===- TargetExegesis.td - Target Exegesis Configuration ---*- tablegen -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// A `bit precise` value to use as operand for an Instruction in to use with llvm-exegesis.
+class OperandValue;
+
+// A configuration for llvm-exegesis to test `Instruction`
+class ExegesisConfiguration {
+  Instruction Instruction = ?;      // The instruction to test.
+  list<OperandValue> OperandValues; // The initial values before repeating the instruction.
+}
+
+// A single value (integer or floating point)
+class ScalarValue : OperandValue;
+
+// A scalar value broadcasted in a packed type.
+class PackedValue : OperandValue {
+  ScalarValue       BroadcastValue;
+}
+
+// Floating Point description
+
+// The precision of the floating point.
+class Ieee754Precision;
+def HalfPrecision   : Ieee754Precision;
+def SinglePrecision : Ieee754Precision;
+def DoublePrecision : Ieee754Precision;
+def X87Precision    : Ieee754Precision;
+
+// The value to set the exponent to (exact value depends on the precision).
+class RawExponentValue;
+def RawExponentZero  : RawExponentValue;
+def RawExponentMax   : RawExponentValue;
+def RawExponentBias  : RawExponentValue;
+
+// The value to set the mantissa to (exact value depends on the precision).
+class MantissaValue;
+def MantissaZero : MantissaValue;
+def MantissaOne  : MantissaValue;
+def MantissaMax  : MantissaValue;
+
+// An instance of the floating point value.
+class Ieee754 : ScalarValue {
+  Ieee754Precision  Precision;
+  bit               Sign;
+  RawExponentValue  Exponent;
+  MantissaValue     Mantissa;
+}
+
+// Integer Description.
+class Integer : ScalarValue {
+  list<bit> Bits;
+}
Index: lib/Target/X86/X86.td
===================================================================
--- lib/Target/X86/X86.td
+++ lib/Target/X86/X86.td
@@ -1200,3 +1200,9 @@
 //===----------------------------------------------------------------------===//
 
 include "X86PfmCounters.td"
+
+//===----------------------------------------------------------------------===//
+// Exegesis Configurations
+//===----------------------------------------------------------------------===//
+
+include "X86ExegesisConfigurations.td"
Index: lib/Target/X86/X86ExegesisConfigurations.td
===================================================================
--- /dev/null
+++ lib/Target/X86/X86ExegesisConfigurations.td
@@ -0,0 +1,27 @@
+def One : Ieee754 {
+  let Precision = SinglePrecision;
+  let Sign = 0;
+  let Exponent = RawExponentBias;
+  let Mantissa = MantissaZero;
+}
+
+def OnePlusEpsilon : Ieee754 {
+  let Precision = SinglePrecision;
+  let Sign = 0;
+  let Exponent = RawExponentBias;
+  let Mantissa = MantissaOne;
+}
+
+def PackedOnes : PackedValue {
+  let BroadcastValue = One;
+}
+
+def PackedOnePlusEpsilons : PackedValue {
+  let BroadcastValue = OnePlusEpsilon;
+}
+
+let Instruction = VDIVPDrr in {
+  def VDIVPDrrExegesisConfiguration : ExegesisConfiguration {
+    let OperandValues = [PackedOnes, PackedOnePlusEpsilons];
+  }
+}