diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -2844,6 +2844,7 @@
     {"tlb-rmi", {AArch64::FeatureTLB_RMI}},
     {"pan-rwv", {AArch64::FeaturePAN_RWV}},
     {"ccpp", {AArch64::FeatureCCPP}},
+    {"rcpc", {AArch64::FeatureRCPC}},
     {"sve", {AArch64::FeatureSVE}},
     {"sve2", {AArch64::FeatureSVE2}},
     {"sve2-aes", {AArch64::FeatureSVE2AES}},
diff --git a/llvm/test/MC/AArch64/directive-arch_extension-negative.s b/llvm/test/MC/AArch64/directive-arch_extension-negative.s
--- a/llvm/test/MC/AArch64/directive-arch_extension-negative.s
+++ b/llvm/test/MC/AArch64/directive-arch_extension-negative.s
@@ -78,3 +78,8 @@
 dc cvap, x7
 // CHECK: error: DC CVAP requires ccpp
 // CHECK-NEXT: dc cvap, x7
+
+.arch_extension norcpc
+ldapr x0, [x1]
+// CHECK: error: instruction requires: rcpc
+// CHECK-NEXT: ldapr x0, [x1]
diff --git a/llvm/test/MC/AArch64/directive-arch_extension.s b/llvm/test/MC/AArch64/directive-arch_extension.s
--- a/llvm/test/MC/AArch64/directive-arch_extension.s
+++ b/llvm/test/MC/AArch64/directive-arch_extension.s
@@ -59,3 +59,7 @@
 .arch_extension ccpp
 dc cvap, x7
 // CHECK: dc cvap, x7
+
+.arch_extension rcpc
+ldapr x0, [x1]
+// CHECK: ldapr x0, [x1]