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 +1,26 @@
+//===- 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.
+//
+//===----------------------------------------------------------------------===//
+
+class Ieee754Precision;
+def HalfPrecision     : Ieee754Precision;
+def SinglePrecision   : Ieee754Precision;
+def DoublePrecision   : Ieee754Precision;
+def ExtendedPrecision : Ieee754Precision;
+
+class InstructionSemantic;
+def Addition          : InstructionSemantic;
+def Subtraction       : InstructionSemantic;
+def Multiplication    : InstructionSemantic;
+def Division          : InstructionSemantic;
+
+class ExegesisConfiguration {
+  Instruction         Instruction;
+  Ieee754Precision    Precision;
+  InstructionSemantic Semantic;
+}
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 +1,14 @@
+
+foreach Instr = [ MULPDrm, MULPDrr, MULSDrm, MULSDrm_Int, MULSDrr, MULSDrr_Int ] in
+def : ExegesisConfiguration {
+    let Instruction = Instr;
+    let Precision   = DoublePrecision;
+    let Semantic    = Multiplication;
+}
+
+foreach Instr = [ MULPSrm, MULPSrr, MULSSrm, MULSSrm_Int, MULSSrr, MULSSrr_Int ] in
+def : ExegesisConfiguration {
+    let Instruction = Instr;
+    let Precision   = SinglePrecision;
+    let Semantic    = Multiplication;
+}