diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
@@ -749,6 +749,7 @@
   dag Input  = input;
   dag Output    = output;
   list<Predicate> Predicates = [];
+  bit isCompressOnly = false;
 }
 
 // Patterns are defined in the same order the compressed instructions appear
@@ -834,25 +835,30 @@
                   (C_SUB GPRC:$rs1, GPRC:$rs2)>;
 def : CompressPat<(XOR GPRC:$rs1, GPRC:$rs1, GPRC:$rs2),
                   (C_XOR GPRC:$rs1, GPRC:$rs2)>;
+let isCompressOnly = true in
 def : CompressPat<(XOR GPRC:$rs1, GPRC:$rs2, GPRC:$rs1),
                   (C_XOR GPRC:$rs1, GPRC:$rs2)>;
 def : CompressPat<(OR GPRC:$rs1, GPRC:$rs1, GPRC:$rs2),
                   (C_OR GPRC:$rs1, GPRC:$rs2)>;
+let isCompressOnly = true in
 def : CompressPat<(OR GPRC:$rs1, GPRC:$rs2, GPRC:$rs1),
                   (C_OR GPRC:$rs1, GPRC:$rs2)>;
 def : CompressPat<(AND GPRC:$rs1, GPRC:$rs1, GPRC:$rs2),
                   (C_AND GPRC:$rs1, GPRC:$rs2)>;
+let isCompressOnly = true in
 def : CompressPat<(AND GPRC:$rs1, GPRC:$rs2, GPRC:$rs1),
                   (C_AND GPRC:$rs1, GPRC:$rs2)>;
 } //  Predicates = [HasStdExtC]
 
 let Predicates = [HasStdExtC, IsRV64] in {
+let isCompressOnly = true in
 def : CompressPat<(ADDIW GPRNoX0:$rd, X0, simm6:$imm),
                   (C_LI GPRNoX0:$rd, simm6:$imm)>;
 def : CompressPat<(SUBW GPRC:$rs1, GPRC:$rs1, GPRC:$rs2),
                   (C_SUBW GPRC:$rs1, GPRC:$rs2)>;
 def : CompressPat<(ADDW GPRC:$rs1, GPRC:$rs1, GPRC:$rs2),
                    (C_ADDW GPRC:$rs1, GPRC:$rs2)>;
+let isCompressOnly = true in
 def : CompressPat<(ADDW GPRC:$rs1, GPRC:$rs2, GPRC:$rs1),
                    (C_ADDW GPRC:$rs1, GPRC:$rs2)>;
 } // Predicates = [HasStdExtC, IsRV64]
@@ -895,10 +901,12 @@
 let Predicates = [HasStdExtC] in {
 def : CompressPat<(JALR X0, GPRNoX0:$rs1, 0),
                   (C_JR GPRNoX0:$rs1)>;
+let isCompressOnly = true in {
 def : CompressPat<(ADD GPRNoX0:$rs1, X0, GPRNoX0:$rs2),
                   (C_MV GPRNoX0:$rs1, GPRNoX0:$rs2)>;
 def : CompressPat<(ADD GPRNoX0:$rs1, GPRNoX0:$rs2, X0),
                   (C_MV GPRNoX0:$rs1, GPRNoX0:$rs2)>;
+}
 def : CompressPat<(ADDI GPRNoX0:$rs1, GPRNoX0:$rs2, 0),
                   (C_MV GPRNoX0:$rs1, GPRNoX0:$rs2)>;
 def : CompressPat<(EBREAK), (C_EBREAK)>;
@@ -907,6 +915,7 @@
                   (C_JALR GPRNoX0:$rs1)>;
 def : CompressPat<(ADD GPRNoX0:$rs1, GPRNoX0:$rs1, GPRNoX0:$rs2),
                   (C_ADD GPRNoX0:$rs1, GPRNoX0:$rs2)>;
+let isCompressOnly = true in
 def : CompressPat<(ADD GPRNoX0:$rs1, GPRNoX0:$rs2, GPRNoX0:$rs1),
                   (C_ADD GPRNoX0:$rs1, GPRNoX0:$rs2)>;
 } // Predicates = [HasStdExtC]
diff --git a/llvm/test/MC/RISCV/compress-rv32i.s b/llvm/test/MC/RISCV/compress-rv32i.s
--- a/llvm/test/MC/RISCV/compress-rv32i.s
+++ b/llvm/test/MC/RISCV/compress-rv32i.s
@@ -21,7 +21,7 @@
 # RUN: | FileCheck -check-prefixes=CHECK-BYTES,CHECK-INST,CHECK-INSTOBJ64 %s
 
 # CHECK-BYTES: 2e 85
-# CHECK-ALIAS: add a0, zero, a1
+# CHECK-ALIAS: mv a0, a1
 # CHECK-INST: c.mv a0, a1
 # CHECK: # encoding:  [0x2e,0x85]
 addi a0, a1, 0
@@ -183,13 +183,13 @@
 jalr zero, 0(ra)
 
 # CHECK-BYTES: 92 80
-# CHECK-ALIAS: add ra, zero, tp
+# CHECK-ALIAS: mv ra, tp
 # CHECK-INST: c.mv ra, tp
 # CHECK:  # encoding: [0x92,0x80]
 add ra, zero, tp
 
 # CHECK-BYTES: 92 80
-# CHECK-ALIAS: add ra, zero, tp
+# CHECK-ALIAS: mv ra, tp
 # CHECK-INST: c.mv ra, tp
 # CHECK:  # encoding: [0x92,0x80]
 add ra, tp, zero
diff --git a/llvm/test/MC/RISCV/option-rvc.s b/llvm/test/MC/RISCV/option-rvc.s
--- a/llvm/test/MC/RISCV/option-rvc.s
+++ b/llvm/test/MC/RISCV/option-rvc.s
@@ -36,7 +36,7 @@
 # CHECK: .option rvc
 .option rvc
 # CHECK-BYTES: 2e 85
-# CHECK-ALIAS: add a0, zero, a1
+# CHECK-ALIAS: mv a0, a1
 # CHECK-INST: c.mv a0, a1
 # CHECK: # encoding:  [0x2e,0x85]
 addi a0, a1, 0
@@ -64,7 +64,7 @@
 # CHECK: .option rvc
 .option rvc
 # CHECK-BYTES: 2e 85
-# CHECK-ALIAS: add a0, zero, a1
+# CHECK-ALIAS: mv a0, a1
 # CHECK-INST: c.mv a0, a1
 # CHECK: # encoding:  [0x2e,0x85]
 addi a0, a1, 0
diff --git a/llvm/test/TableGen/AsmPredicateCombiningRISCV.td b/llvm/test/TableGen/AsmPredicateCombiningRISCV.td
--- a/llvm/test/TableGen/AsmPredicateCombiningRISCV.td
+++ b/llvm/test/TableGen/AsmPredicateCombiningRISCV.td
@@ -59,6 +59,7 @@
   dag Input = input;
   dag Output = output;
   list<Predicate> Predicates = predicates;
+  bit isCompressOnly = false;
 }
 
 // COMPRESS-LABEL: static bool compressInst
diff --git a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
--- a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
+++ b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
@@ -101,11 +101,12 @@
     IndexedMap<OpData>
         DestOperandMap; // Maps operands in the Dest Instruction
                         // to the corresponding Source instruction operand.
+    bool IsCompressOnly;
     CompressPat(CodeGenInstruction &S, CodeGenInstruction &D,
                 std::vector<Record *> RF, IndexedMap<OpData> &SourceMap,
-                IndexedMap<OpData> &DestMap)
+                IndexedMap<OpData> &DestMap, bool IsCompressOnly)
         : Source(S), Dest(D), PatReqFeatures(RF), SourceOperandMap(SourceMap),
-          DestOperandMap(DestMap) {}
+          DestOperandMap(DestMap), IsCompressOnly(IsCompressOnly) {}
   };
   enum EmitterType { Compress, Uncompress, CheckCompress };
   RecordKeeper &Records;
@@ -466,7 +467,8 @@
   });
 
   CompressPatterns.push_back(CompressPat(SourceInst, DestInst, PatReqFeatures,
-                                         SourceOperandMap, DestOperandMap));
+                                         SourceOperandMap, DestOperandMap,
+                                         Rec->getValueAsBit("isCompressOnly")));
 }
 
 static void
@@ -634,6 +636,9 @@
     EType == EmitterType::Compress || EType == EmitterType::Uncompress;
 
   for (auto &CompressPat : CompressPatterns) {
+    if (EType == EmitterType::Uncompress && CompressPat.IsCompressOnly)
+      continue;
+
     std::string CondString;
     std::string CodeString;
     raw_string_ostream CondStream(CondString);