diff --git a/llvm/test/TableGen/GlobalISelEmitterMatchTableOptimizer.td b/llvm/test/TableGen/GlobalISelEmitterMatchTableOptimizer.td
new file mode 100644
--- /dev/null
+++ b/llvm/test/TableGen/GlobalISelEmitterMatchTableOptimizer.td
@@ -0,0 +1,85 @@
+// RUN: llvm-tblgen %s -gen-global-isel -optimize-match-table=true -I %p/../../include -I %p/Common -o - | FileCheck %s
+
+include "llvm/Target/Target.td"
+include "GlobalISelEmitterCommon.td"
+
+// Two LOADs with same output size but different input size, hence their
+// GIM_CheckPointerToAny should *not* be merged
+def LOAD8 : I<(outs GPR8:$dst), (ins GPR8:$src), []>;
+def LOAD32 : I<(outs GPR8:$dst), (ins GPR32:$src), []>;
+// CHECK: Label 1: @{{[0-9]+}}
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L1_ID:[0-9]+]]*/ [[L1_AT:[0-9]+]],
+// CHECK-NEXT: GIM_CheckMemorySizeEqualToLLT, /*MI*/0, /*MMO*/0, /*OpIdx*/0,
+// CHECK-NEXT:   GIM_CheckAtomicOrdering, /*MI*/0, /*Order*/(int64_t)AtomicOrdering::NotAtomic,
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/0, /*Op*/0, /*RC*/MyTarget::GPR8RegClassID,
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L2_ID:[0-9]+]]*/ [[L2_AT:[0-9]+]],
+// CHECK-NEXT: // MIs[0] src
+// CHECK-NEXT: GIM_CheckPointerToAny, /*MI*/0, /*Op*/1, /*SizeInBits*/8,
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/0, /*Op*/1, /*RC*/MyTarget::GPR8RegClassID,
+// CHECK-NEXT: // (ld:{ *:[i8] } GPR8:{ *:[i8] }:$src)<<P:Predicate_unindexedload>><<P:Predicate_load>>  =>  (LOAD8:{ *:[i8] } GPR8:{ *:[i8] }:$src)
+// CHECK-NEXT: GIR_MutateOpcode, /*InsnID*/0, /*RecycleInsnID*/0, /*Opcode*/MyTarget::LOAD8,
+// CHECK-NEXT: GIR_ConstrainSelectedInstOperands, /*InsnID*/0,
+// CHECK-NEXT: // GIR_Coverage, 0,
+// CHECK-NEXT: GIR_Done,
+// CHECK-NEXT: // Label [[L2_ID]]: @[[L2_AT]]
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L3_ID:[0-9]+]]*/ [[L3_AT:[0-9]+]],
+// CHECK-NEXT: // MIs[0] src
+// CHECK-NEXT: GIM_CheckPointerToAny, /*MI*/0, /*Op*/1, /*SizeInBits*/32,
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/0, /*Op*/1, /*RC*/MyTarget::GPR32RegClassID,
+// CHECK-NEXT: // (ld:{ *:[i8] } GPR32:{ *:[i32] }:$src)<<P:Predicate_unindexedload>><<P:Predicate_load>>  =>  (LOAD32:{ *:[i8] } GPR32:{ *:[i32] }:$src)
+// CHECK-NEXT: GIR_MutateOpcode, /*InsnID*/0, /*RecycleInsnID*/0, /*Opcode*/MyTarget::LOAD32,
+// CHECK-NEXT: GIR_ConstrainSelectedInstOperands, /*InsnID*/0,
+// CHECK-NEXT: // GIR_Coverage, 1,
+// CHECK-NEXT: GIR_Done,
+// CHECK-NEXT: // Label [[L3_ID]]: @[[L3_AT]]
+// CHECK-NEXT: GIM_Reject,
+// CHECK-NEXT: // Label [[L1_ID]]: @[[L1_AT]]
+def : Pat<(i8 (load GPR8:$src)),
+          (LOAD8 GPR8:$src)>;
+def : Pat<(i8 (load GPR32:$src)),
+          (LOAD32 GPR32:$src)>;
+
+// Two LOADs with same output size and input size, hence their
+// GIM_CheckPointerToAny *should* be merged
+def S0 : Register<"s0"> { let Namespace = "MyTarget"; }
+def GPR16 : RegisterClass<"MyTarget", [i16], 16, (add S0)>;
+def LOAD16 : I<(outs GPR16:$dst), (ins GPR16:$src), []>;
+def LOAD16Imm : I<(outs GPR16:$dst), (ins GPR16:$src), []>;
+// CHECK: // Label 2: @{{[0-9]+}}
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L1_ID:[0-9]+]]*/ [[L1_AT:[0-9]+]],
+// CHECK-NEXT: GIM_CheckMemorySizeEqualToLLT, /*MI*/0, /*MMO*/0, /*OpIdx*/0,
+// CHECK-NEXT: GIM_CheckAtomicOrdering, /*MI*/0, /*Order*/(int64_t)AtomicOrdering::NotAtomic,
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/0, /*Op*/0, /*RC*/MyTarget::GPR16RegClassID,
+// CHECK-NEXT: GIM_CheckPointerToAny, /*MI*/0, /*Op*/1, /*SizeInBits*/16,
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L2_ID:[0-9]+]]*/ [[L2_AT:[0-9]+]],
+// CHECK-NEXT: GIM_RecordInsn, /*DefineMI*/1, /*MI*/0, /*OpIdx*/1, // MIs[1]
+// CHECK-NEXT: GIM_CheckOpcode, /*MI*/1, TargetOpcode::G_ADD,
+// CHECK-NEXT: GIM_CheckType, /*MI*/1, /*Op*/1, /*Type*/GILLT_s16,
+// CHECK-NEXT: GIM_CheckType, /*MI*/1, /*Op*/2, /*Type*/GILLT_s16,
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/1, /*Op*/1, /*RC*/MyTarget::GPR16RegClassID,
+// CHECK-NEXT: GIM_CheckConstantInt, /*MI*/1, /*Op*/2, 10,
+// CHECK-NEXT: GIM_CheckIsSafeToFold, /*InsnID*/1,
+// CHECK-NEXT: // (ld:{ *:[i16] } (add:{ *:[i16] } GPR16:{ *:[i16] }:$src, 10:{ *:[i16] }))<<P:Predicate_unindexedload>><<P:Predicate_load>>  =>  (LOAD16Imm:{ *:[i16] } GPR16:{ *:[i16] }:$src)
+// CHECK-NEXT: GIR_BuildMI, /*InsnID*/0, /*Opcode*/MyTarget::LOAD16Imm,
+// CHECK-NEXT: GIR_Copy, /*NewInsnID*/0, /*OldInsnID*/0, /*OpIdx*/0, // dst
+// CHECK-NEXT: GIR_Copy, /*NewInsnID*/0, /*OldInsnID*/1, /*OpIdx*/1, // src
+// CHECK-NEXT: GIR_MergeMemOperands, /*InsnID*/0, /*MergeInsnID's*/0, 1, GIU_MergeMemOperands_EndOfList,
+// CHECK-NEXT: GIR_EraseFromParent, /*InsnID*/0,
+// CHECK-NEXT: GIR_ConstrainSelectedInstOperands, /*InsnID*/0,
+// CHECK-NEXT: // GIR_Coverage, 3,
+// CHECK-NEXT: GIR_Done,
+// CHECK-NEXT: // Label [[L2_ID]]: @[[L2_AT]]
+// CHECK-NEXT: GIM_Try, /*On fail goto*//*Label [[L3_ID:[0-9]+]]*/ [[L3_AT:[0-9]+]],
+// CHECK-NEXT: GIM_CheckRegBankForClass, /*MI*/0, /*Op*/1, /*RC*/MyTarget::GPR16RegClassID,
+// CHECK-NEXT: // (ld:{ *:[i16] } GPR16:{ *:[i16] }:$src)<<P:Predicate_unindexedload>><<P:Predicate_load>>  =>  (LOAD16:{ *:[i16] } GPR16:{ *:[i16] }:$src)
+// CHECK-NEXT: GIR_MutateOpcode, /*InsnID*/0, /*RecycleInsnID*/0, /*Opcode*/MyTarget::LOAD16,
+// CHECK-NEXT: GIR_ConstrainSelectedInstOperands, /*InsnID*/0,
+// CHECK-NEXT: // GIR_Coverage, 2,
+// CHECK-NEXT: GIR_Done,
+// CHECK-NEXT: // Label [[L3_ID]]: @[[L3_AT]]
+// CHECK-NEXT: GIM_Reject,
+// CHECK-NEXT: // Label [[L1_ID]]: @[[L1_AT]]
+def : Pat<(i16 (load GPR16:$src)),
+          (LOAD16 GPR16:$src)>;
+def : Pat<(i16 (load (add GPR16:$src, 10))),
+          (LOAD16Imm GPR16:$src)>;
diff --git a/llvm/utils/TableGen/GlobalISelEmitter.cpp b/llvm/utils/TableGen/GlobalISelEmitter.cpp
--- a/llvm/utils/TableGen/GlobalISelEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelEmitter.cpp
@@ -1271,10 +1271,15 @@
       : OperandPredicateMatcher(OPM_PointerToAny, InsnVarID, OpIdx),
         SizeInBits(SizeInBits) {}
 
-  static bool classof(const OperandPredicateMatcher *P) {
+  static bool classof(const PredicateMatcher *P) {
     return P->getKind() == OPM_PointerToAny;
   }
 
+  bool isIdentical(const PredicateMatcher &B) const override {
+    return OperandPredicateMatcher::isIdentical(B) &&
+           SizeInBits == cast<PointerToAnyOperandMatcher>(&B)->SizeInBits;
+  }
+
   void emitPredicateOpcodes(MatchTable &Table,
                             RuleMatcher &Rule) const override {
     Table << MatchTable::Opcode("GIM_CheckPointerToAny")