diff --git a/clang/test/Driver/riscv-arch.c b/clang/test/Driver/riscv-arch.c
--- a/clang/test/Driver/riscv-arch.c
+++ b/clang/test/Driver/riscv-arch.c
@@ -452,6 +452,82 @@
 // RUN: -fsyntax-only 2>&1 | FileCheck -check-prefix=RV32-ZBA %s
 // RV32-ZBA: "-target-feature" "+zba"
 
+// RUN: %clang -target riscv32-unknown-elf -march=rv32ip -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-P-NOFLAG %s
+// RV32-EXPERIMENTAL-P-NOFLAG: error: invalid arch name 'rv32ip'
+// RV32-EXPERIMENTAL-P-NOFLAG: requires '-menable-experimental-extensions'
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32ip -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-P-NOVERS %s
+// RV32-EXPERIMENTAL-P-NOVERS: error: invalid arch name 'rv32ip'
+// RV32-EXPERIMENTAL-P-NOVERS: experimental extension requires explicit version number
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32ip0p1 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-P-BADVERS %s
+// RV32-EXPERIMENTAL-P-BADVERS: error: invalid arch name 'rv32ip0p1'
+// RV32-EXPERIMENTAL-P-BADVERS: unsupported version number 0.1 for experimental extension
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32ip0p911 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-P-GOODVERS %s
+// RV32-EXPERIMENTAL-P-GOODVERS: "-target-feature" "+experimental-p"
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izbpbo -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZBPBO-NOFLAG %s
+// RV32-EXPERIMENTAL-ZBPBO-NOFLAG: error: invalid arch name 'rv32izbpbo'
+// RV32-EXPERIMENTAL-ZBPBO-NOFLAG: requires '-menable-experimental-extensions'
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izbpbo -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZBPBO-NOVERS %s
+// RV32-EXPERIMENTAL-ZBPBO-NOVERS: error: invalid arch name 'rv32izbpbo'
+// RV32-EXPERIMENTAL-ZBPBO-NOVERS: experimental extension requires explicit version number
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izbpbo0p1 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZBPBO-BADVERS %s
+// RV32-EXPERIMENTAL-ZBPBO-BADVERS: error: invalid arch name 'rv32izbpbo0p1'
+// RV32-EXPERIMENTAL-ZBPBO-BADVERS: unsupported version number 0.1 for experimental extension
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izbpbo0p911 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZBPBO-GOODVERS %s
+// RV32-EXPERIMENTAL-ZBPBO-GOODVERS: "-target-feature" "+experimental-zbpbo"
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpn -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPN-NOFLAG %s
+// RV32-EXPERIMENTAL-ZPN-NOFLAG: error: invalid arch name 'rv32izpn'
+// RV32-EXPERIMENTAL-ZPN-NOFLAG: requires '-menable-experimental-extensions'
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpn -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPN-NOVERS %s
+// RV32-EXPERIMENTAL-ZPN-NOVERS: error: invalid arch name 'rv32izpn'
+// RV32-EXPERIMENTAL-ZPN-NOVERS: experimental extension requires explicit version number
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpn0p1 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPN-BADVERS %s
+// RV32-EXPERIMENTAL-ZPN-BADVERS: error: invalid arch name 'rv32izpn0p1'
+// RV32-EXPERIMENTAL-ZPN-BADVERS: unsupported version number 0.1 for experimental extension
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpn0p911 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPN-GOODVERS %s
+// RV32-EXPERIMENTAL-ZPN-GOODVERS: "-target-feature" "+experimental-zpn"
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpsfoperand -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPSFOPERAND-NOFLAG %s
+// RV32-EXPERIMENTAL-ZPSFOPERAND-NOFLAG: error: invalid arch name 'rv32izpsfoperand'
+// RV32-EXPERIMENTAL-ZPSFOPERAND-NOFLAG: requires '-menable-experimental-extensions'
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpsfoperand -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPSFOPERAND-NOVERS %s
+// RV32-EXPERIMENTAL-ZPSFOPERAND-NOVERS: error: invalid arch name 'rv32izpsfoperand'
+// RV32-EXPERIMENTAL-ZPSFOPERAND-NOVERS: experimental extension requires explicit version number
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpsfoperand0p1 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPSFOPERAND-BADVERS %s
+// RV32-EXPERIMENTAL-ZPSFOPERAND-BADVERS: error: invalid arch name 'rv32izpsfoperand0p1'
+// RV32-EXPERIMENTAL-ZPSFOPERAND-BADVERS: unsupported version number 0.1 for experimental extension
+
+// RUN: %clang -target riscv32-unknown-elf -march=rv32izpsfoperand0p911 -menable-experimental-extensions -### %s -c 2>&1 | \
+// RUN:   FileCheck -check-prefix=RV32-EXPERIMENTAL-ZPSFOPERAND-GOODVERS %s
+// RV32-EXPERIMENTAL-ZPSFOPERAND-GOODVERS: "-target-feature" "+experimental-zpsfoperand"
+
 // RUN: %clang --target=riscv32-unknown-elf -march=rv32iv0p1 -### %s -c 2>&1 | \
 // RUN:   FileCheck -check-prefix=RV32-V-BADVERS %s
 // RV32-V-BADVERS: error: invalid arch name 'rv32iv0p1'
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
@@ -42,6 +42,10 @@
 // CHECK-NOT: __riscv_zkr
 // CHECK-NOT: __riscv_zkt
 // CHECK-NOT: __riscv_zk
+// CHECK-NOT: __riscv_p
+// CHECK-NOT: __riscv_zbpbo
+// CHECK-NOT: __riscv_zpn
+// CHECK-NOT: __riscv_zpsfoperand
 // CHECK-NOT: __riscv_zicbom
 // CHECK-NOT: __riscv_zicboz
 
@@ -224,6 +228,44 @@
 // CHECK-ZBT-NOT: __riscv_b
 // CHECK-ZBT-EXT: __riscv_zbt 93000{{$}}
 
+// RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv32ip0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-P-EXT %s
+// RUN: %clang -target riscv64-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv64ip0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-P-EXT %s
+// CHECK-P-EXT: __riscv_p 911000{{$}}
+// CHECK-P-EXT: __riscv_zbpbo 911000{{$}}
+// CHECK-P-EXT: __riscv_zpn 911000{{$}}
+// CHECK-P-EXT: __riscv_zpsfoperand 911000{{$}}
+
+// RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv32izbpbo0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZBPBO-EXT %s
+// RUN: %clang -target riscv64-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv64izbpbo0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZBPBO-EXT %s
+// CHECK-ZBPBO-NOT: __riscv_p
+// CHECK-ZBPBO-EXT: __riscv_zbpbo 911000{{$}}
+
+// RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv32izpn0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZPN-EXT %s
+// RUN: %clang -target riscv64-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv64izpn0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZPN-EXT %s
+// CHECK-ZPN-NOT: __riscv_p
+// CHECK-ZPN-EXT: __riscv_zpn 911000{{$}}
+
+// RUN: %clang -target riscv32-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv32izpsfoperand0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZPSFOPERAND-EXT %s
+// RUN: %clang -target riscv64-unknown-linux-gnu -menable-experimental-extensions \
+// RUN: -march=rv64izpsfoperand0p911 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZPSFOPERAND-EXT %s
+// CHECK-ZPSFOPERAND-NOT: __riscv_p
+// CHECK-ZPSFOPERAND-EXT: __riscv_zpsfoperand 911000{{$}}
+
 // RUN: %clang -target riscv32-unknown-linux-gnu \
 // RUN: -march=rv32iv1p0 -x c -E -dM %s \
 // RUN: -o - | FileCheck --check-prefix=CHECK-V-EXT %s
diff --git a/llvm/lib/Support/RISCVISAInfo.cpp b/llvm/lib/Support/RISCVISAInfo.cpp
--- a/llvm/lib/Support/RISCVISAInfo.cpp
+++ b/llvm/lib/Support/RISCVISAInfo.cpp
@@ -109,6 +109,11 @@
     {"zbr", RISCVExtensionVersion{0, 93}},
     {"zbt", RISCVExtensionVersion{0, 93}},
     {"zvfh", RISCVExtensionVersion{0, 1}},
+
+    {"p", RISCVExtensionVersion{0, 911}},
+    {"zbpbo", RISCVExtensionVersion{0, 911}},
+    {"zpn", RISCVExtensionVersion{0, 911}},
+    {"zpsfoperand", RISCVExtensionVersion{0, 911}},
 };
 
 static bool stripExperimentalPrefix(StringRef &Ext) {
@@ -598,8 +603,8 @@
 
     // The order is OK, then push it into features.
     // TODO: Use version number when setting target features
-    // Currently LLVM supports only "mafdcbv".
-    StringRef SupportedStandardExtension = "mafdcbv";
+    // Currently LLVM supports only "mafdcbpv".
+    StringRef SupportedStandardExtension = "mafdcbpv";
     if (!SupportedStandardExtension.contains(C))
       return createStringError(errc::invalid_argument,
                                "unsupported standard user-level extension '%c'",
@@ -773,6 +778,7 @@
 static const char *ImpliedExtsZkn[] = {"zbkb", "zbkc", "zbkx", "zkne", "zknd", "zknh"};
 static const char *ImpliedExtsZks[] = {"zbkb", "zbkc", "zbkx", "zksed", "zksh"};
 static const char *ImpliedExtsZvfh[] = {"zve32f"};
+static const char *ImpliedExtsP[] = {"zbpbo", "zpn", "zpsfoperand"};
 
 struct ImpliedExtsEntry {
   StringLiteral Name;
@@ -787,6 +793,7 @@
 
 // Note: The table needs to be sorted by name.
 static constexpr ImpliedExtsEntry ImpliedExts[] = {
+    {{"p"}, {ImpliedExtsP}},
     {{"v"}, {ImpliedExtsV}},
     {{"zdinx"}, {ImpliedExtsZdinx}},
     {{"zfh"}, {ImpliedExtsZfh}},
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
@@ -187,3 +187,15 @@
 
 .attribute arch, "rv32if_zkt1p0_zve32f1p0_zve32x1p0_zvl32b1p0"
 # CHECK: attribute      5, "rv32i2p0_f2p0_zkt1p0_zve32f1p0_zve32x1p0_zvl32b1p0"
+
+.attribute arch, "rv32ip0p911"
+# CHECK: attribute      5, "rv32i2p0_p0p911_zbpbo0p911_zpn0p911_zpsfoperand0p911"
+
+.attribute arch, "rv32izbpbo0p911"
+# CHECK: attribute      5, "rv32i2p0_zbpbo0p911"
+
+.attribute arch, "rv32izpn0p911"
+# CHECK: attribute      5, "rv32i2p0_zpn0p911"
+
+.attribute arch, "rv32izpsfoperand0p911"
+# CHECK: attribute      5, "rv32i2p0_zpsfoperand0p911"