diff --git a/clang/test/Preprocessor/riscv-target-features.c b/clang/test/Preprocessor/riscv-target-features.c
index ea81c66204430..664279cb12394 100644
--- a/clang/test/Preprocessor/riscv-target-features.c
+++ b/clang/test/Preprocessor/riscv-target-features.c
@@ -74,6 +74,7 @@
 // CHECK-NOT: __riscv_xventanacondops {{.*$}}
 // CHECK-NOT: __riscv_za128rs {{.*$}}
 // CHECK-NOT: __riscv_za64rs {{.*$}}
+// CHECK-NOT: __riscv_zacas {{.*$}}
 // CHECK-NOT: __riscv_zawrs {{.*$}}
 // CHECK-NOT: __riscv_zba {{.*$}}
 // CHECK-NOT: __riscv_zbb {{.*$}}
@@ -166,7 +167,6 @@
 // CHECK-NOT: __riscv_ssqosid{{.*$}}
 // CHECK-NOT: __riscv_supm{{.*$}}
 // CHECK-NOT: __riscv_zaamo {{.*$}}
-// CHECK-NOT: __riscv_zacas {{.*$}}
 // CHECK-NOT: __riscv_zalasr {{.*$}}
 // CHECK-NOT: __riscv_zalrsc {{.*$}}
 // CHECK-NOT: __riscv_zcmop {{.*$}}
@@ -660,6 +660,14 @@
 // RUN:   -o - | FileCheck --check-prefix=CHECK-ZA64RS-EXT %s
 // CHECK-ZA64RS-EXT: __riscv_za64rs 1000000{{$}}
 
+// RUN: %clang --target=riscv32 \
+// RUN:   -march=rv32i_zacas1p0 -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-ZACAS-EXT %s
+// RUN: %clang --target=riscv64 \
+// RUN:   -march=rv64i_zacas1p0 -E -dM %s \
+// RUN:   -o - | FileCheck --check-prefix=CHECK-ZACAS-EXT %s
+// CHECK-ZACAS-EXT: __riscv_zacas 1000000{{$}}
+
 // RUN: %clang --target=riscv32-unknown-linux-gnu \
 // RUN:   -march=rv32izawrs -E -dM %s \
 // RUN:   -o - | FileCheck --check-prefix=CHECK-ZAWRS-EXT %s
@@ -1485,14 +1493,6 @@
 // RUN:   -o - | FileCheck --check-prefix=CHECK-ZAAMO-EXT %s
 // CHECK-ZAAMO-EXT: __riscv_zaamo 2000{{$}}
 
-// RUN: %clang --target=riscv32 -menable-experimental-extensions \
-// RUN:   -march=rv32i_zacas1p0 -E -dM %s \
-// RUN:   -o - | FileCheck --check-prefix=CHECK-ZACAS-EXT %s
-// RUN: %clang --target=riscv64 -menable-experimental-extensions \
-// RUN:   -march=rv64i_zacas1p0 -E -dM %s \
-// RUN:   -o - | FileCheck --check-prefix=CHECK-ZACAS-EXT %s
-// CHECK-ZACAS-EXT: __riscv_zacas 1000000{{$}}
-
 // RUN: %clang --target=riscv32 -menable-experimental-extensions \
 // RUN:   -march=rv32i_zalasr0p1 -E -dM %s \
 // RUN:   -o - | FileCheck --check-prefix=CHECK-ZALASR-EXT %s
diff --git a/llvm/docs/RISCVUsage.rst b/llvm/docs/RISCVUsage.rst
index ed443596897ae..8d293b0214430 100644
--- a/llvm/docs/RISCVUsage.rst
+++ b/llvm/docs/RISCVUsage.rst
@@ -117,6 +117,7 @@ on support follow.
      ``V``             Supported
      ``Za128rs``       Supported (`See note <#riscv-profiles-extensions-note>`__)
      ``Za64rs``        Supported (`See note <#riscv-profiles-extensions-note>`__)
+     ``Zacas``         Supported (`See note <#riscv-zacas-note>`__)
      ``Zawrs``         Assembly Support
      ``Zba``           Supported
      ``Zbb``           Supported
@@ -236,6 +237,11 @@ Supported
 ``Za128rs``, ``Za64rs``, ``Zic64b``, ``Ziccamoa``, ``Ziccif``, ``Zicclsm``, ``Ziccrse``, ``Shcounterenvw``, ``Shgatpa``, ``Shtvala``, ``Shvsatpa``, ``Shvstvala``, ``Shvstvecd``, ``Ssccptr``, ``Sscounterenw``, ``Ssstateen``, ``Ssstrict``, ``Sstvala``, ``Sstvecd``, ``Ssu64xl``, ``Svade``, ``Svbare``
   These extensions are defined as part of the `RISC-V Profiles specification <https://github.com/riscv/riscv-profiles/releases/tag/v1.0>`__.  They do not introduce any new features themselves, but instead describe existing hardware features.
 
+  .. _riscv-zacas-note:
+
+``Zacas``
+  amocas.w will be used for i32 cmpxchg. amocas.d will be used i64 cmpxchg on RV64. The compiler will not generate amocas.d on RV32 or amocas.q on RV64 due to ABI compatibilty. These can only be used in the assembler.
+
 Experimental Extensions
 =======================
 
@@ -252,9 +258,6 @@ The primary goal of experimental support is to assist in the process of ratifica
 ``experimental-zabha``
   LLVM implements the `v1.0-rc1 draft specification <https://github.com/riscv/riscv-zabha/tree/v1.0-rc1>`__.
 
-``experimental-zacas``
-  LLVM implements the `1.0-rc1 draft specification <https://github.com/riscv/riscv-zacas/releases/tag/v1.0-rc1>`__.
-
 ``experimental-zalasr``
   LLVM implements the `0.0.5 draft specification <https://github.com/mehnadnerd/riscv-zalasr>`__.
 
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index 51b6527f65bb0..8ce6ee5cebb26 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -103,6 +103,7 @@ Changes to the RISC-V Backend
 * Codegen support was added for the Zimop (May-Be-Operations) extension.
 * The experimental Ssnpm, Smnpm, Smmpm, Sspm, and Supm 0.8.1 Pointer Masking extensions are supported.
 * The experimental Ssqosid extension is supported.
+* Zacas is no longer experimental.
 
 Changes to the WebAssembly Backend
 ----------------------------------
diff --git a/llvm/lib/Support/RISCVISAInfo.cpp b/llvm/lib/Support/RISCVISAInfo.cpp
index d028302b8c4d9..68f5c36e8fafc 100644
--- a/llvm/lib/Support/RISCVISAInfo.cpp
+++ b/llvm/lib/Support/RISCVISAInfo.cpp
@@ -109,6 +109,7 @@ static const RISCVSupportedExtension SupportedExtensions[] = {
 
     {"za128rs", {1, 0}},
     {"za64rs", {1, 0}},
+    {"zacas", {1, 0}},
     {"zawrs", {1, 0}},
 
     {"zba", {1, 0}},
@@ -220,7 +221,6 @@ static const RISCVSupportedExtension SupportedExperimentalExtensions[] = {
 
     {"zaamo", {0, 2}},
     {"zabha", {1, 0}},
-    {"zacas", {1, 0}},
     {"zalasr", {0, 1}},
     {"zalrsc", {0, 2}},
 
diff --git a/llvm/lib/Target/RISCV/RISCVFeatures.td b/llvm/lib/Target/RISCV/RISCVFeatures.td
index bcaf447774949..9773b2998c7dc 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -185,7 +185,7 @@ def HasStdExtZabha : Predicate<"Subtarget->hasStdExtZabha()">,
                          "'Zabha' (Byte and Halfword Atomic Memory Operations)">;
 
 def FeatureStdExtZacas
-    : SubtargetFeature<"experimental-zacas", "HasStdExtZacas", "true",
+    : SubtargetFeature<"zacas", "HasStdExtZacas", "true",
                        "'Zacas' (Atomic Compare-And-Swap Instructions)">;
 def HasStdExtZacas : Predicate<"Subtarget->hasStdExtZacas()">,
                      AssemblerPredicate<(all_of FeatureStdExtZacas),
diff --git a/llvm/test/CodeGen/RISCV/atomic-cmpxchg-branch-on-result.ll b/llvm/test/CodeGen/RISCV/atomic-cmpxchg-branch-on-result.ll
index 90d78779b764d..18b66499b85fe 100644
--- a/llvm/test/CodeGen/RISCV/atomic-cmpxchg-branch-on-result.ll
+++ b/llvm/test/CodeGen/RISCV/atomic-cmpxchg-branch-on-result.ll
@@ -1,13 +1,13 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -mtriple=riscv32 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=NOZACAS,RV32IA %s
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=ZACAS,RV32IA-ZACAS %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=NOZACAS,RV64IA %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=ZACAS,RV64IA-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas,+experimental-zabha -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas,+experimental-zabha -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=ZACAS,RV64IA-ZABHA %s
 
 ; Test cmpxchg followed by a branch on the cmpxchg success value to see if the
diff --git a/llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll b/llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll
index 8df37bf40975c..394dffa346ec6 100644
--- a/llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll
+++ b/llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll
@@ -3,25 +3,25 @@
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 ; RUN: llc -mtriple=riscv32 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-WMO %s
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-ZACAS,RV32IA-WMO-ZACAS %s
 ; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-TSO %s
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-ZACAS,RV32IA-TSO-ZACAS %s
 ; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-WMO %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZACAS,RV64IA-WMO-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas,+experimental-zabha -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas,+experimental-zabha -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZABHA,RV64IA-WMO-ZABHA %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-TSO %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZACAS,RV64IA-TSO-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zacas,+experimental-zabha -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+zacas,+experimental-zabha -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZABHA,RV64IA-TSO-ZABHA %s
 
 define void @cmpxchg_i8_monotonic_monotonic(ptr %ptr, i8 %cmp, i8 %val) nounwind {
diff --git a/llvm/test/CodeGen/RISCV/atomic-rmw.ll b/llvm/test/CodeGen/RISCV/atomic-rmw.ll
index ee802507a02f3..fe53001740613 100644
--- a/llvm/test/CodeGen/RISCV/atomic-rmw.ll
+++ b/llvm/test/CodeGen/RISCV/atomic-rmw.ll
@@ -12,22 +12,22 @@
 ; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-NOZACAS,RV64IA-TSO,RV64IA-TSO-NOZACAS %s
 
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-ZACAS,RV32IA-WMO,RV32IA-WMO-ZACAS %s
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-ztso,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-ZACAS,RV32IA-TSO,RV32IA-TSO-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZACAS,RV64IA-WMO,RV64IA-WMO-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZACAS,RV64IA-TSO,RV64IA-TSO-ZACAS %s
 
 ; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zabha -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-WMO,RV64IA-WMO-ZABHA,RV64IA-WMO-ZABHA-NOZACAS %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zabha -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-TSO,RV64IA-TSO-ZABHA,RV64IA-TSO-ZABHA-NOZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zabha,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zabha,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-WMO,RV64IA-WMO-ZABHA,RV64IA-WMO-ZABHA-ZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zabha,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-ztso,+experimental-zabha,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-TSO,RV64IA-TSO-ZABHA,RV64IA-TSO-ZABHA-ZACAS %s
 
 define i8 @atomicrmw_xchg_i8_monotonic(ptr %a, i8 %b) nounwind {
diff --git a/llvm/test/CodeGen/RISCV/atomic-signext.ll b/llvm/test/CodeGen/RISCV/atomic-signext.ll
index 47807f78d176e..bdf3b28d2d523 100644
--- a/llvm/test/CodeGen/RISCV/atomic-signext.ll
+++ b/llvm/test/CodeGen/RISCV/atomic-signext.ll
@@ -3,13 +3,13 @@
 ; RUN:   | FileCheck -check-prefix=RV32I %s
 ; RUN: llc -mtriple=riscv32 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-NOZACAS %s
-; RUN: llc -mtriple=riscv32 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv32 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV32IA,RV32IA-ZACAS %s
 ; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64I %s
 ; RUN: llc -mtriple=riscv64 -mattr=+a -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-NOZACAS %s
-; RUN: llc -mtriple=riscv64 -mattr=+a,+experimental-zacas -verify-machineinstrs < %s \
+; RUN: llc -mtriple=riscv64 -mattr=+a,+zacas -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefixes=RV64IA,RV64IA-ZACAS %s
 
 define signext i8 @atomic_load_i8_unordered(ptr %a) nounwind {
diff --git a/llvm/test/CodeGen/RISCV/attributes.ll b/llvm/test/CodeGen/RISCV/attributes.ll
index 13635a94d6411..561b0f21dc377 100644
--- a/llvm/test/CodeGen/RISCV/attributes.ll
+++ b/llvm/test/CodeGen/RISCV/attributes.ll
@@ -111,7 +111,7 @@
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zvfbfmin %s -o - | FileCheck --check-prefixes=CHECK,RV32ZVFBFMIN %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zvfbfwma %s -o - | FileCheck --check-prefixes=CHECK,RV32ZVFBFWMA %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zaamo %s -o - | FileCheck --check-prefix=RV32ZAAMO %s
-; RUN: llc -mtriple=riscv32 -mattr=+experimental-zacas %s -o - | FileCheck --check-prefix=RV32ZACAS %s
+; RUN: llc -mtriple=riscv32 -mattr=+zacas %s -o - | FileCheck --check-prefix=RV32ZACAS %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zalasr %s -o - | FileCheck --check-prefix=RV32ZALASR %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zalrsc %s -o - | FileCheck --check-prefix=RV32ZALRSC %s
 ; RUN: llc -mtriple=riscv32 -mattr=+experimental-zicfilp %s -o - | FileCheck --check-prefix=RV32ZICFILP %s
@@ -240,7 +240,7 @@
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zvfbfmin %s -o - | FileCheck --check-prefixes=CHECK,RV64ZVFBFMIN %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zvfbfwma %s -o - | FileCheck --check-prefixes=CHECK,RV64ZVFBFWMA %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zaamo %s -o - | FileCheck --check-prefix=RV64ZAAMO %s
-; RUN: llc -mtriple=riscv64 -mattr=+experimental-zacas %s -o - | FileCheck --check-prefix=RV64ZACAS %s
+; RUN: llc -mtriple=riscv64 -mattr=+zacas %s -o - | FileCheck --check-prefix=RV64ZACAS %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zalasr %s -o - | FileCheck --check-prefix=RV64ZALASR %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zalrsc %s -o - | FileCheck --check-prefix=RV64ZALRSC %s
 ; RUN: llc -mtriple=riscv64 -mattr=+experimental-zicfilp %s -o - | FileCheck --check-prefix=RV64ZICFILP %s
diff --git a/llvm/test/MC/RISCV/rv32zacas-invalid.s b/llvm/test/MC/RISCV/rv32zacas-invalid.s
index b86246ca2ed18..11d20dacd8a78 100644
--- a/llvm/test/MC/RISCV/rv32zacas-invalid.s
+++ b/llvm/test/MC/RISCV/rv32zacas-invalid.s
@@ -1,4 +1,4 @@
-# RUN: not llvm-mc -triple riscv32 -mattr=+experimental-zacas < %s 2>&1 | FileCheck %s
+# RUN: not llvm-mc -triple riscv32 -mattr=+zacas < %s 2>&1 | FileCheck %s
 
 # Non-zero offsets not supported for the third operand (rs1).
 amocas.w a1, a3, 1(a5) # CHECK: :[[@LINE]]:18: error: optional integer offset must be 0
diff --git a/llvm/test/MC/RISCV/rv32zacas-valid.s b/llvm/test/MC/RISCV/rv32zacas-valid.s
index d80b963f0a047..05a9cdd5cc218 100644
--- a/llvm/test/MC/RISCV/rv32zacas-valid.s
+++ b/llvm/test/MC/RISCV/rv32zacas-valid.s
@@ -1,12 +1,12 @@
-# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-zacas -riscv-no-aliases -show-encoding \
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+zacas -riscv-no-aliases -show-encoding \
 # RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zacas -riscv-no-aliases -show-encoding \
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+zacas -riscv-no-aliases -show-encoding \
 # RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-zacas < %s \
-# RUN:     | llvm-objdump --mattr=+experimental-zacas -M no-aliases -d -r - \
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+zacas < %s \
+# RUN:     | llvm-objdump --mattr=+zacas -M no-aliases -d -r - \
 # RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zacas < %s \
-# RUN:     | llvm-objdump --mattr=+experimental-zacas -M no-aliases -d -r - \
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+zacas < %s \
+# RUN:     | llvm-objdump --mattr=+zacas -M no-aliases -d -r - \
 # RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
 # RUN: not llvm-mc -triple=riscv32 -mattr=+a -show-encoding %s 2>&1 \
 # RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
diff --git a/llvm/test/MC/RISCV/rv64zacas-valid.s b/llvm/test/MC/RISCV/rv64zacas-valid.s
index 843401b50871a..694f43b9b4407 100644
--- a/llvm/test/MC/RISCV/rv64zacas-valid.s
+++ b/llvm/test/MC/RISCV/rv64zacas-valid.s
@@ -1,7 +1,7 @@
-# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zacas -riscv-no-aliases -show-encoding \
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+zacas -riscv-no-aliases -show-encoding \
 # RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zacas < %s \
-# RUN:     | llvm-objdump --mattr=+experimental-zacas -M no-aliases -d -r - \
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+zacas < %s \
+# RUN:     | llvm-objdump --mattr=+zacas -M no-aliases -d -r - \
 # RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
 # RUN: not llvm-mc -triple=riscv64 -mattr=+a -show-encoding %s 2>&1 \
 # RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
diff --git a/llvm/test/MC/RISCV/rvzabha-zacas-valid.s b/llvm/test/MC/RISCV/rvzabha-zacas-valid.s
index 8ad2f99d3feba..f1f705e625b87 100644
--- a/llvm/test/MC/RISCV/rvzabha-zacas-valid.s
+++ b/llvm/test/MC/RISCV/rvzabha-zacas-valid.s
@@ -1,12 +1,12 @@
-# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-zabha,+experimental-zacas -riscv-no-aliases -show-encoding \
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-zabha,+zacas -riscv-no-aliases -show-encoding \
 # RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zabha,+experimental-zacas -riscv-no-aliases -show-encoding \
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zabha,+zacas -riscv-no-aliases -show-encoding \
 # RUN:     | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-zabha,+experimental-zacas < %s \
-# RUN:     | llvm-objdump --mattr=+experimental-zabha,+experimental-zacas -M no-aliases -d -r - \
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-zabha,+zacas < %s \
+# RUN:     | llvm-objdump --mattr=+experimental-zabha,+zacas -M no-aliases -d -r - \
 # RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
-# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zabha,+experimental-zacas < %s \
-# RUN:     | llvm-objdump --mattr=+experimental-zabha,+experimental-zacas -M no-aliases -d -r - \
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zabha,+zacas < %s \
+# RUN:     | llvm-objdump --mattr=+experimental-zabha,+zacas -M no-aliases -d -r - \
 # RUN:     | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
 # RUN: not llvm-mc -triple=riscv32 -mattr=+experimental-zabha -show-encoding %s 2>&1 \
 # RUN:        | FileCheck %s --check-prefix=CHECK-ERROR
diff --git a/llvm/unittests/Support/RISCVISAInfoTest.cpp b/llvm/unittests/Support/RISCVISAInfoTest.cpp
index df4c7f7de8a3d..82cce23638d5f 100644
--- a/llvm/unittests/Support/RISCVISAInfoTest.cpp
+++ b/llvm/unittests/Support/RISCVISAInfoTest.cpp
@@ -752,6 +752,7 @@ R"(All available -march extensions for RISC-V
     zmmul               1.0
     za128rs             1.0
     za64rs              1.0
+    zacas               1.0
     zawrs               1.0
     zfa                 1.0
     zfh                 1.0
@@ -873,7 +874,6 @@ Experimental extensions
     zimop               0.1
     zaamo               0.2
     zabha               1.0
-    zacas               1.0
     zalasr              0.1
     zalrsc              0.2
     zfbfmin             1.0