diff --git a/clang/lib/Basic/Targets/RISCV.h b/clang/lib/Basic/Targets/RISCV.h
--- a/clang/lib/Basic/Targets/RISCV.h
+++ b/clang/lib/Basic/Targets/RISCV.h
@@ -39,7 +39,6 @@
   bool HasZbf = false;
   bool HasZbm = false;
   bool HasZbp = false;
-  bool HasZbproposedc = false;
   bool HasZbr = false;
   bool HasZbs = false;
   bool HasZbt = false;
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -207,9 +207,6 @@
   if (HasZbp)
     Builder.defineMacro("__riscv_zbp", "93000");
 
-  if (HasZbproposedc)
-    Builder.defineMacro("__riscv_zbproposedc", "93000");
-
   if (HasZbr)
     Builder.defineMacro("__riscv_zbr", "93000");
 
@@ -274,7 +271,6 @@
       .Case("experimental-zbf", HasZbf)
       .Case("experimental-zbm", HasZbm)
       .Case("experimental-zbp", HasZbp)
-      .Case("experimental-zbproposedc", HasZbproposedc)
       .Case("experimental-zbr", HasZbr)
       .Case("experimental-zbs", HasZbs)
       .Case("experimental-zbt", HasZbt)
@@ -316,8 +312,6 @@
       HasZbm = true;
     else if (Feature == "+experimental-zbp")
       HasZbp = true;
-    else if (Feature == "+experimental-zbproposedc")
-      HasZbproposedc = true;
     else if (Feature == "+experimental-zbr")
       HasZbr = true;
     else if (Feature == "+experimental-zbs")
diff --git a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
--- a/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/RISCV.cpp
@@ -60,7 +60,7 @@
 isExperimentalExtension(StringRef Ext) {
   if (Ext == "b" || Ext == "zba" || Ext == "zbb" || Ext == "zbc" ||
       Ext == "zbe" || Ext == "zbf" || Ext == "zbm" || Ext == "zbp" ||
-      Ext == "zbr" || Ext == "zbs" || Ext == "zbt" || Ext == "zbproposedc")
+      Ext == "zbr" || Ext == "zbs" || Ext == "zbt")
     return RISCVExtensionVersion{"0", "93"};
   if (Ext == "v" || Ext == "zvamo" || Ext == "zvlsseg")
     return RISCVExtensionVersion{"0", "10"};
diff --git a/clang/test/Preprocessor/riscv-target-features.c b/clang/test/Preprocessor/riscv-target-features.c
--- a/clang/test/Preprocessor/riscv-target-features.c
+++ b/clang/test/Preprocessor/riscv-target-features.c
@@ -25,7 +25,6 @@
 // CHECK-NOT: __riscv_zbf
 // CHECK-NOT: __riscv_zbm
 // CHECK-NOT: __riscv_zbp
-// CHECK-NOT: __riscv_zbproposedc
 // CHECK-NOT: __riscv_zbr
 // CHECK-NOT: __riscv_zbs
 // CHECK-NOT: __riscv_zbt
@@ -182,15 +181,6 @@
 // CHECK-ZBP-NOT: __riscv_b
 // CHECK-ZBP-EXT: __riscv_zbp 93000
 
-// RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
-// RUN: -march=rv32izbproposedc0p93 -x c -E -dM %s \
-// RUN: -o - | FileCheck --check-prefix=CHECK-ZBPROPOSEDC-EXT %s
-// RUN: %clang -target riscv64-unknown-linux-gnu -menable-experimental-extensions \
-// RUN: -march=rv32izbproposedc0p93 -x c -E -dM %s \
-// RUN: -o - | FileCheck --check-prefix=CHECK-ZBPROPOSEDC-EXT %s
-// CHECK-ZBPROPOSEDC-NOT: __riscv_b
-// CHECK-ZBPROPOSEDC-EXT: __riscv_zbproposedc 93000
-
 // RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
 // RUN: -march=rv32izbr0p93 -x c -E -dM %s \
 // RUN: -o - | FileCheck --check-prefix=CHECK-ZBR-EXT %s
diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -2078,8 +2078,6 @@
     clearFeatureBits(RISCV::FeatureStdExtZbf, "experimental-zbf");
     clearFeatureBits(RISCV::FeatureStdExtZbm, "experimental-zbm");
     clearFeatureBits(RISCV::FeatureStdExtZbp, "experimental-zbp");
-    clearFeatureBits(RISCV::FeatureStdExtZbproposedc,
-                     "experimental-zbproposedc");
     clearFeatureBits(RISCV::FeatureStdExtZbr, "experimental-zbr");
     clearFeatureBits(RISCV::FeatureStdExtZbs, "experimental-zbs");
     clearFeatureBits(RISCV::FeatureStdExtZbt, "experimental-zbt");
@@ -2130,9 +2128,6 @@
           setFeatureBits(RISCV::FeatureStdExtZbm, "experimental-zbm");
         else if (Ext == "zbp")
           setFeatureBits(RISCV::FeatureStdExtZbp, "experimental-zbp");
-        else if (Ext == "zbproposedc")
-          setFeatureBits(RISCV::FeatureStdExtZbproposedc,
-                         "experimental-zbproposedc");
         else if (Ext == "zbr")
           setFeatureBits(RISCV::FeatureStdExtZbr, "experimental-zbr");
         else if (Ext == "zbs")
@@ -2207,8 +2202,6 @@
         formalArchStr = (Twine(formalArchStr) + "_zbm0p93").str();
       if (getFeatureBits(RISCV::FeatureStdExtZbp))
         formalArchStr = (Twine(formalArchStr) + "_zbp0p93").str();
-      if (getFeatureBits(RISCV::FeatureStdExtZbproposedc))
-        formalArchStr = (Twine(formalArchStr) + "_zbproposedc0p93").str();
       if (getFeatureBits(RISCV::FeatureStdExtZbr))
         formalArchStr = (Twine(formalArchStr) + "_zbr0p93").str();
       if (getFeatureBits(RISCV::FeatureStdExtZbs))
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -449,19 +449,6 @@
       }
     }
 
-    if (STI.getFeatureBits()[RISCV::FeatureStdExtZbproposedc] &&
-        STI.getFeatureBits()[RISCV::FeatureStdExtC]) {
-      LLVM_DEBUG(
-          dbgs() << "Trying RVBC32 table (BitManip 16-bit Instruction):\n");
-      // Calling the auto-generated decoder function.
-      Result = decodeInstruction(DecoderTableRVBC16, MI, Insn, Address,
-                                 this, STI);
-      if (Result != MCDisassembler::Fail) {
-        Size = 2;
-        return Result;
-      }
-    }
-
     LLVM_DEBUG(dbgs() << "Trying RISCV_C table (16-bit Instruction):\n");
     // Calling the auto-generated decoder function.
     Result = decodeInstruction(DecoderTable16, MI, Insn, Address, this, STI);
diff --git a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
--- a/llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
+++ b/llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
@@ -80,8 +80,6 @@
     Arch += "_zbm0p93";
   if (STI.hasFeature(RISCV::FeatureStdExtZbp))
     Arch += "_zbp0p93";
-  if (STI.hasFeature(RISCV::FeatureStdExtZbproposedc))
-    Arch += "_zbproposedc0p93";
   if (STI.hasFeature(RISCV::FeatureStdExtZbr))
     Arch += "_zbr0p93";
   if (STI.hasFeature(RISCV::FeatureStdExtZbs))
diff --git a/llvm/lib/Target/RISCV/RISCV.td b/llvm/lib/Target/RISCV/RISCV.td
--- a/llvm/lib/Target/RISCV/RISCV.td
+++ b/llvm/lib/Target/RISCV/RISCV.td
@@ -135,13 +135,6 @@
                                    "'Zbb' (Base 'B' Instructions) or "
                                    "'Zbp' (Permutation 'B' Instructions)">;
 
-def FeatureStdExtZbproposedc
-    : SubtargetFeature<"experimental-zbproposedc", "HasStdExtZbproposedc", "true",
-                       "'Zbproposedc' (Proposed Compressed 'B' Instructions)">;
-def HasStdExtZbproposedc : Predicate<"Subtarget->hasStdExtZbproposedc()">,
-                           AssemblerPredicate<(all_of FeatureStdExtZbproposedc),
-                           "'Zbproposedc' (Proposed Compressed 'B' Instructions)">;
-
 def FeatureStdExtB
     : SubtargetFeature<"experimental-b", "HasStdExtB", "true",
                        "'B' (Bit Manipulation Instructions)",
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoB.td b/llvm/lib/Target/RISCV/RISCVInstrInfoB.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoB.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoB.td
@@ -610,37 +610,6 @@
 }
 } // Predicates = [HasStdExtZbbOrZbp]
 
-//===----------------------------------------------------------------------===//
-// Future compressed instructions
-//===----------------------------------------------------------------------===//
-
-// The presence of these instructions in the B extension is purely experimental
-// and they should be moved to the C extension as soon as they are ratified.
-
-let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-class RVBInstC<bits<2> funct2, string opcodestr>
-    : RVInst16<(outs GPRC:$rs_wb), (ins GPRC:$rs), opcodestr, "$rs", [],
-               InstFormatCR> {
-  bits<3> rs;
-  let Constraints = "$rs = $rs_wb";
-
-  let Inst{15-12} = 0b0110;
-  let Inst{11-10} = funct2;
-  let Inst{9-7} = rs;
-  let Inst{6-0} = 0b0000001;
-}
-
-// The namespace RVBC exists to avoid encoding conflicts with the compressed
-// instructions c.addi16sp and c.lui already implemented in the C extension.
-
-let DecoderNamespace = "RVBC", Predicates = [HasStdExtZbproposedc, HasStdExtC] in {
-def C_NOT : RVBInstC<0b00, "c.not">, Sched<[]>;
-def C_NEG : RVBInstC<0b01, "c.neg">, Sched<[]>;
-} // DecoderNamespace = "RVBC", Predicates = [HasStdExtZbproposedc, HasStdExtC]
-
-let DecoderNamespace = "RVBC", Predicates = [HasStdExtZbproposedc, HasStdExtZba, HasStdExtC, IsRV64] in
-def C_ZEXTW : RVBInstC<0b10, "c.zext.w">, Sched<[]>;
-
 //===----------------------------------------------------------------------===//
 // Pseudo Instructions
 //===----------------------------------------------------------------------===//
@@ -795,21 +764,6 @@
                 (BEXTI GPR:$rd, GPR:$rs1, uimmlog2xlen:$shamt), 0>;
 } // Predicates = [HasStdExtZbs]
 
-//===----------------------------------------------------------------------===//
-// Compressed Instruction patterns
-//===----------------------------------------------------------------------===//
-let Predicates = [HasStdExtZbproposedc, HasStdExtC] in {
-def : CompressPat<(XORI GPRC:$rs1, GPRC:$rs1, -1),
-                  (C_NOT GPRC:$rs1)>;
-def : CompressPat<(SUB GPRC:$rs1, X0, GPRC:$rs1),
-                  (C_NEG GPRC:$rs1)>;
-} // Predicates = [HasStdExtZbproposedc, HasStdExtC]
-
-let Predicates = [HasStdExtZbproposedc, HasStdExtZba, HasStdExtC, IsRV64] in {
-def : CompressPat<(ADDUW GPRC:$rs1, GPRC:$rs1, X0),
-                  (C_ZEXTW GPRC:$rs1)>;
-} // Predicates = [HasStdExtZbproposedc, HasStdExtC, IsRV64]
-
 //===----------------------------------------------------------------------===//
 // Codegen patterns
 //===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/RISCV/RISCVSubtarget.h b/llvm/lib/Target/RISCV/RISCVSubtarget.h
--- a/llvm/lib/Target/RISCV/RISCVSubtarget.h
+++ b/llvm/lib/Target/RISCV/RISCVSubtarget.h
@@ -50,7 +50,6 @@
   bool HasStdExtZbr = false;
   bool HasStdExtZbs = false;
   bool HasStdExtZbt = false;
-  bool HasStdExtZbproposedc = false;
   bool HasStdExtV = false;
   bool HasStdExtZvlsseg = false;
   bool HasStdExtZvamo = false;
@@ -118,7 +117,6 @@
   bool hasStdExtZbr() const { return HasStdExtZbr; }
   bool hasStdExtZbs() const { return HasStdExtZbs; }
   bool hasStdExtZbt() const { return HasStdExtZbt; }
-  bool hasStdExtZbproposedc() const { return HasStdExtZbproposedc; }
   bool hasStdExtV() const { return HasStdExtV; }
   bool hasStdExtZvlsseg() const { return HasStdExtZvlsseg; }
   bool hasStdExtZvamo() const { return HasStdExtZvamo; }
diff --git a/llvm/test/CodeGen/RISCV/attributes.ll b/llvm/test/CodeGen/RISCV/attributes.ll
--- a/llvm/test/CodeGen/RISCV/attributes.ll
+++ b/llvm/test/CodeGen/RISCV/attributes.ll
@@ -15,7 +15,6 @@
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbf %s -o - | FileCheck --check-prefix=RV32ZBF %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbm %s -o - | FileCheck --check-prefix=RV32ZBM %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbp %s -o - | FileCheck --check-prefix=RV32ZBP %s
-; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbproposedc %s -o - | FileCheck --check-prefix=RV32ZBPROPOSEDC %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbr %s -o - | FileCheck --check-prefix=RV32ZBR %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbs %s -o - | FileCheck --check-prefix=RV32ZBS %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zbt %s -o - | FileCheck --check-prefix=RV32ZBT %s
@@ -35,7 +34,6 @@
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbf %s -o - | FileCheck --check-prefix=RV64ZBF %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbm %s -o - | FileCheck --check-prefix=RV64ZBM %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbp %s -o - | FileCheck --check-prefix=RV64ZBP %s
-; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbproposedc %s -o - | FileCheck --check-prefix=RV64ZBPROPOSEDC %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbr %s -o - | FileCheck --check-prefix=RV64ZBR %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbs %s -o - | FileCheck --check-prefix=RV64ZBS %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zbt %s -o - | FileCheck --check-prefix=RV64ZBT %s
@@ -56,7 +54,6 @@
 ; RV32ZBF: .attribute 5, "rv32i2p0_zbf0p93"
 ; RV32ZBM: .attribute 5, "rv32i2p0_zbm0p93"
 ; RV32ZBP: .attribute 5, "rv32i2p0_zbp0p93"
-; RV32ZBPROPOSEDC: .attribute 5, "rv32i2p0_zbproposedc0p93"
 ; RV32ZBR: .attribute 5, "rv32i2p0_zbr0p93"
 ; RV32ZBS: .attribute 5, "rv32i2p0_zbs0p93"
 ; RV32ZBT: .attribute 5, "rv32i2p0_zbt0p93"
@@ -76,7 +73,6 @@
 ; RV64ZBF: .attribute 5, "rv64i2p0_zbf0p93"
 ; RV64ZBM: .attribute 5, "rv64i2p0_zbm0p93"
 ; RV64ZBP: .attribute 5, "rv64i2p0_zbp0p93"
-; RV64ZBPROPOSEDC: .attribute 5, "rv64i2p0_zbproposedc0p93"
 ; RV64ZBR: .attribute 5, "rv64i2p0_zbr0p93"
 ; RV64ZBS: .attribute 5, "rv64i2p0_zbs0p93"
 ; RV64ZBT: .attribute 5, "rv64i2p0_zbt0p93"
diff --git a/llvm/test/MC/RISCV/attribute-arch.s b/llvm/test/MC/RISCV/attribute-arch.s
--- a/llvm/test/MC/RISCV/attribute-arch.s
+++ b/llvm/test/MC/RISCV/attribute-arch.s
@@ -63,9 +63,6 @@
 .attribute arch, "rv32izbp"
 # CHECK: attribute      5, "rv32i2p0_zbp0p93"
 
-.attribute arch, "rv32izbproposedc"
-# CHECK: attribute      5, "rv32i2p0_zbproposedc0p93"
-
 .attribute arch, "rv32izbr"
 # CHECK: attribute      5, "rv32i2p0_zbr0p93"
 
diff --git a/llvm/test/MC/RISCV/compress-rv32b.s b/llvm/test/MC/RISCV/compress-rv32b.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/compress-rv32b.s
+++ /dev/null
@@ -1,35 +0,0 @@
-# RUN: llvm-mc -triple riscv32 -mattr=+c,+experimental-zbproposedc -show-encoding < %s \
-# RUN:   | FileCheck -check-prefixes=CHECK,CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv32 -mattr=+c,+experimental-zbproposedc -show-encoding \
-# RUN:   -riscv-no-aliases < %s | FileCheck -check-prefixes=CHECK,CHECK-INST %s
-# RUN: llvm-mc -triple riscv32 -mattr=+c,+experimental-zbproposedc -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv32 --mattr=+c,+experimental-zbproposedc -d - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv32 -mattr=+c,+experimental-zbproposedc -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv32 --mattr=+c,+experimental-zbproposedc -d -M no-aliases - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-INST %s
-
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc -show-encoding < %s \
-# RUN:   | FileCheck -check-prefixes=CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc -show-encoding \
-# RUN:   -riscv-no-aliases < %s | FileCheck -check-prefixes=CHECK-INST %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv64 --mattr=+c,+experimental-zbproposedc -d - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv64 --mattr=+c,+experimental-zbproposedc -d -M no-aliases - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-INST %s
-
-# Tests bit manipulation instructions available in rv32 and in rv64.
-
-# CHECK-BYTES: 01 60
-# CHECK-ALIAS: not s0, s0
-# CHECK-INST: c.not s0
-# CHECK: # encoding:  [0x01,0x60]
-not s0, s0
-
-# CHECK-BYTES: 01 64
-# CHECK-ALIAS: neg s0, s0
-# CHECK-INST: c.neg s0
-# CHECK: # encoding:  [0x01,0x64]
-neg s0, s0
diff --git a/llvm/test/MC/RISCV/compress-rv64b.s b/llvm/test/MC/RISCV/compress-rv64b.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/compress-rv64b.s
+++ /dev/null
@@ -1,18 +0,0 @@
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -show-encoding < %s \
-# RUN:   | FileCheck -check-prefixes=CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -show-encoding \
-# RUN:   -riscv-no-aliases < %s | FileCheck -check-prefixes=CHECK-INST %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv64 --mattr=+c,+experimental-zbproposedc,+experimental-b -d - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-ALIAS %s
-# RUN: llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -filetype=obj < %s \
-# RUN:   | llvm-objdump  --triple=riscv64 --mattr=+c,+experimental-zbproposedc,+experimental-b -d -M no-aliases - \
-# RUN:   | FileCheck -check-prefixes=CHECK-BYTES,CHECK-INST %s
-
-# Tests compressed instructions available in rv64 and not in rv32.
-
-# CHECK-BYTES: 01 68
-# CHECK-ALIAS: zext.w s0, s0
-# CHECK-INST: c.zext.w s0
-# CHECK: # encoding:  [0x01,0x68]
-zext.w s0, s0
diff --git a/llvm/test/MC/RISCV/rv32zbproposedc-invalid.s b/llvm/test/MC/RISCV/rv32zbproposedc-invalid.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/rv32zbproposedc-invalid.s
+++ /dev/null
@@ -1,6 +0,0 @@
-# RUN: not llvm-mc -triple riscv32 -mattr=+c,+experimental-zbproposedc,+experimental-Zba < %s 2>&1 | FileCheck %s
-
-# Too many operands
-c.not s0, s1 # CHECK: :[[@LINE]]:11: error: invalid operand for instruction
-c.neg s0, s1 # CHECK: :[[@LINE]]:11: error: invalid operand for instruction
-c.zext.w s0 # CHECK: :[[@LINE]]:1: error: instruction requires the following: RV64I Base Instruction Set
diff --git a/llvm/test/MC/RISCV/rv32zbproposedc-valid.s b/llvm/test/MC/RISCV/rv32zbproposedc-valid.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/rv32zbproposedc-valid.s
+++ /dev/null
@@ -1,17 +0,0 @@
-# RUN: llvm-mc %s -triple=riscv32 -mattr=+c,+experimental-zbproposedc -riscv-no-aliases -show-encoding \
-# RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc %s -triple=riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -riscv-no-aliases -show-encoding \
-# RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+c,+experimental-zbproposedc < %s \
-# RUN:     | llvm-objdump --mattr=+c,+experimental-zbproposedc -M no-aliases -d -r - \
-# RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b < %s \
-# RUN:     | llvm-objdump --mattr=+c,+experimental-zbproposedc,+experimental-b -M no-aliases -d -r - \
-# RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
-
-# CHECK-ASM-AND-OBJ: c.not s0
-# CHECK-ASM: encoding: [0x01,0x60]
-c.not s0
-# CHECK-ASM-AND-OBJ: c.neg s0
-# CHECK-ASM: encoding: [0x01,0x64]
-c.neg s0
diff --git a/llvm/test/MC/RISCV/rv64zbproposedc-invalid.s b/llvm/test/MC/RISCV/rv64zbproposedc-invalid.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/rv64zbproposedc-invalid.s
+++ /dev/null
@@ -1,4 +0,0 @@
-# RUN: not llvm-mc -triple riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b < %s 2>&1 | FileCheck %s
-
-# Too many operands
-c.zext.w s0, s1 # CHECK: :[[@LINE]]:14: error: invalid operand for instruction
diff --git a/llvm/test/MC/RISCV/rv64zbproposedc-valid.s b/llvm/test/MC/RISCV/rv64zbproposedc-valid.s
deleted file mode 100644
--- a/llvm/test/MC/RISCV/rv64zbproposedc-valid.s
+++ /dev/null
@@ -1,10 +0,0 @@
-# RUN: llvm-mc %s -triple=riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b -riscv-no-aliases -show-encoding \
-# RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+c,+experimental-zbproposedc,+experimental-b < %s \
-# RUN:     | llvm-objdump --mattr=+c,+experimental-zbproposedc,+experimental-b -M no-aliases -d -r - \
-# RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
-
-
-# CHECK-ASM-AND-OBJ: c.zext.w s0
-# CHECK-ASM: encoding: [0x01,0x68]
-c.zext.w s0