Index: clang/test/Driver/aarch64-cpus.c
===================================================================
--- clang/test/Driver/aarch64-cpus.c
+++ clang/test/Driver/aarch64-cpus.c
@@ -45,6 +45,22 @@
 // ARM64-CA35: "-cc1"{{.*}} "-triple" "arm64{{.*}}" "-target-cpu" "cortex-a35"
 // ARM64-CA35-TUNE: "-cc1"{{.*}} "-triple" "arm64{{.*}}" "-target-cpu" "generic"
 
+// RUN: %clang -target aarch64 -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34 %s
+// RUN: %clang -target aarch64 -mlittle-endian -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34 %s
+// RUN: %clang -target aarch64_be -mlittle-endian -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34 %s
+// RUN: %clang -target aarch64 -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-TUNE %s
+// RUN: %clang -target aarch64 -mlittle-endian -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-TUNE %s
+// RUN: %clang -target aarch64_be -mlittle-endian -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-TUNE %s
+// CA34: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-cpu" "cortex-a34"
+// CA34-TUNE: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-cpu" "generic"
+
+// RUN: %clang -target arm64 -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=ARM64-CA34 %s
+// RUN: %clang -target arm64 -mlittle-endian -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=ARM64-CA34 %s
+// RUN: %clang -target arm64 -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=ARM64-CA34-TUNE %s
+// RUN: %clang -target arm64 -mlittle-endian -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=ARM64-CA34-TUNE %s
+// ARM64-CA34: "-cc1"{{.*}} "-triple" "arm64{{.*}}" "-target-cpu" "cortex-a34"
+// ARM64-CA34-TUNE: "-cc1"{{.*}} "-triple" "arm64{{.*}}" "-target-cpu" "generic"
+
 // RUN: %clang -target aarch64 -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53 %s
 // RUN: %clang -target aarch64 -mlittle-endian -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53 %s
 // RUN: %clang -target aarch64_be -mlittle-endian -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53 %s
@@ -267,6 +283,15 @@
 // CA35-BE: "-cc1"{{.*}} "-triple" "aarch64_be{{.*}}" "-target-cpu" "cortex-a35"
 // CA35-BE-TUNE: "-cc1"{{.*}} "-triple" "aarch64_be{{.*}}" "-target-cpu" "generic"
 
+// RUN: %clang -target aarch64_be -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE %s
+// RUN: %clang -target aarch64 -mbig-endian -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE %s
+// RUN: %clang -target aarch64_be -mbig-endian -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE %s
+// RUN: %clang -target aarch64_be -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE-TUNE %s
+// RUN: %clang -target aarch64 -mbig-endian -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE-TUNE %s
+// RUN: %clang -target aarch64_be -mbig-endian -mtune=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CA34-BE-TUNE %s
+// CA34-BE: "-cc1"{{.*}} "-triple" "aarch64_be{{.*}}" "-target-cpu" "cortex-a34"
+// CA34-BE-TUNE: "-cc1"{{.*}} "-triple" "aarch64_be{{.*}}" "-target-cpu" "generic"
+
 // RUN: %clang -target aarch64_be -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53-BE %s
 // RUN: %clang -target aarch64 -mbig-endian -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53-BE %s
 // RUN: %clang -target aarch64_be -mbig-endian -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CA53-BE %s
Index: clang/test/Preprocessor/aarch64-target-features.c
===================================================================
--- clang/test/Preprocessor/aarch64-target-features.c
+++ clang/test/Preprocessor/aarch64-target-features.c
@@ -152,6 +152,7 @@
 // RUN: %clang -target aarch64 -mcpu=apple-s4 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-APPLE-A12 %s
 // RUN: %clang -target aarch64 -mcpu=apple-s5 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-APPLE-A12 %s
 // RUN: %clang -target aarch64 -mcpu=cyclone -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-APPLE-A7 %s
+// RUN: %clang -target aarch64 -mcpu=cortex-a34 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-A34 %s
 // RUN: %clang -target aarch64 -mcpu=cortex-a35 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-A35 %s
 // RUN: %clang -target aarch64 -mcpu=cortex-a53 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-A53 %s
 // RUN: %clang -target aarch64 -mcpu=cortex-a57 -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-MCPU-A57 %s
@@ -166,6 +167,7 @@
 // CHECK-MCPU-APPLE-A10: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+fp-armv8" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto" "-target-feature" "+rdm" "-target-feature" "+zcm" "-target-feature" "+zcz" "-target-feature" "+sha2" "-target-feature" "+aes"
 // CHECK-MCPU-APPLE-A11: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+v8.2a" "-target-feature" "+fp-armv8" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto" "-target-feature" "+ras" "-target-feature" "+lse" "-target-feature" "+rdm" "-target-feature" "+zcm" "-target-feature" "+zcz" "-target-feature" "+sha2" "-target-feature" "+aes"
 // CHECK-MCPU-APPLE-A12: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+v8.3a" "-target-feature" "+fp-armv8" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto" "-target-feature" "+fullfp16" "-target-feature" "+ras" "-target-feature" "+lse" "-target-feature" "+rdm" "-target-feature" "+rcpc" "-target-feature" "+zcm" "-target-feature" "+zcz" "-target-feature" "+sha2" "-target-feature" "+aes"
+// CHECK-MCPU-A34: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+neon" "-target-feature" "+crc"
 // CHECK-MCPU-APPLE-A13: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+v8.4a" "-target-feature" "+fp-armv8" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto" "-target-feature" "+dotprod" "-target-feature" "+fullfp16" "-target-feature" "+ras" "-target-feature" "+lse" "-target-feature" "+rdm" "-target-feature" "+rcpc" "-target-feature" "+zcm" "-target-feature" "+zcz" "-target-feature" "+fp16fml" "-target-feature" "+sm4" "-target-feature" "+sha3" "-target-feature" "+sha2" "-target-feature" "+aes"
 // CHECK-MCPU-A35: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto"
 // CHECK-MCPU-A53: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-feature" "+neon" "-target-feature" "+crc" "-target-feature" "+crypto"
Index: llvm/include/llvm/Support/AArch64TargetParser.def
===================================================================
--- llvm/include/llvm/Support/AArch64TargetParser.def
+++ llvm/include/llvm/Support/AArch64TargetParser.def
@@ -85,6 +85,8 @@
 #ifndef AARCH64_CPU_NAME
 #define AARCH64_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)
 #endif
+AARCH64_CPU_NAME("cortex-a34", ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, false,
+                 (AArch64::AEK_CRC))
 AARCH64_CPU_NAME("cortex-a35", ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, false,
                  (AArch64::AEK_CRC))
 AARCH64_CPU_NAME("cortex-a53", ARMV8A, FK_CRYPTO_NEON_FP_ARMV8, true,
Index: llvm/lib/Support/Host.cpp
===================================================================
--- llvm/lib/Support/Host.cpp
+++ llvm/lib/Support/Host.cpp
@@ -178,6 +178,8 @@
         // The CPU part is a 3 digit hexadecimal number with a 0x prefix. The
         // values correspond to the "Part number" in the CP15/c0 register. The
         // contents are specified in the various processor manuals.
+        // This corresponds to the Main ID Register in Technical Reference Manuals.
+        // and is used in programs like sys-utils
         return StringSwitch<const char *>(Lines[I].substr(8).ltrim("\t :"))
             .Case("0x926", "arm926ej-s")
             .Case("0xb02", "mpcore")
@@ -190,6 +192,7 @@
             .Case("0xc20", "cortex-m0")
             .Case("0xc23", "cortex-m3")
             .Case("0xc24", "cortex-m4")
+            .Case("0xd02", "cortex-a34")
             .Case("0xd04", "cortex-a35")
             .Case("0xd03", "cortex-a53")
             .Case("0xd07", "cortex-a57")
Index: llvm/lib/Target/AArch64/AArch64.td
===================================================================
--- llvm/lib/Target/AArch64/AArch64.td
+++ llvm/lib/Target/AArch64/AArch64.td
@@ -853,6 +853,7 @@
                      ]>;
 
 def : ProcessorModel<"cortex-a35", CortexA53Model, [ProcA35]>;
+def : ProcessorModel<"cortex-a34", CortexA53Model, [ProcA35]>;
 def : ProcessorModel<"cortex-a53", CortexA53Model, [ProcA53]>;
 def : ProcessorModel<"cortex-a55", CortexA53Model, [ProcA55]>;
 def : ProcessorModel<"cortex-a57", CortexA57Model, [ProcA57]>;
Index: llvm/test/CodeGen/AArch64/cpus.ll
===================================================================
--- llvm/test/CodeGen/AArch64/cpus.ll
+++ llvm/test/CodeGen/AArch64/cpus.ll
@@ -3,6 +3,7 @@
 
 ; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=generic 2>&1 | FileCheck %s
 ; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=cortex-a35 2>&1 | FileCheck %s
+; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=cortex-a34 2>&1 | FileCheck %s
 ; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=cortex-a53 2>&1 | FileCheck %s
 ; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=cortex-a55 2>&1 | FileCheck %s
 ; RUN: llc < %s -mtriple=arm64-unknown-unknown -mcpu=cortex-a57 2>&1 | FileCheck %s
Index: llvm/test/CodeGen/AArch64/remat.ll
===================================================================
--- llvm/test/CodeGen/AArch64/remat.ll
+++ llvm/test/CodeGen/AArch64/remat.ll
@@ -1,3 +1,4 @@
+; RUN: llc -mtriple=aarch64-linux-gnuabi -mcpu=cortex-a34 -o - %s | FileCheck %s
 ; RUN: llc -mtriple=aarch64-linux-gnuabi -mcpu=cortex-a35 -o - %s | FileCheck %s
 ; RUN: llc -mtriple=aarch64-linux-gnuabi -mcpu=cortex-a53 -o - %s | FileCheck %s
 ; RUN: llc -mtriple=aarch64-linux-gnuabi -mcpu=cortex-a55 -o - %s | FileCheck %s
Index: llvm/unittests/Support/TargetParserTest.cpp
===================================================================
--- llvm/unittests/Support/TargetParserTest.cpp
+++ llvm/unittests/Support/TargetParserTest.cpp
@@ -781,6 +781,10 @@
       AArch64::AEK_NONE, ""));
 
   EXPECT_TRUE(testAArch64CPU(
+      "cortex-a34", "armv8-a", "crypto-neon-fp-armv8",
+      AArch64::AEK_CRC | AArch64::AEK_CRYPTO | AArch64::AEK_FP |
+      AArch64::AEK_SIMD, "8-A"));
+  EXPECT_TRUE(testAArch64CPU(
       "cortex-a35", "armv8-a", "crypto-neon-fp-armv8",
       AArch64::AEK_CRC | AArch64::AEK_CRYPTO | AArch64::AEK_FP |
       AArch64::AEK_SIMD, "8-A"));
@@ -957,7 +961,7 @@
       "8.2-A"));
 }
 
-static constexpr unsigned NumAArch64CPUArchs = 35;
+static constexpr unsigned NumAArch64CPUArchs = 36;
 
 TEST(TargetParserTest, testAArch64CPUArchList) {
   SmallVector<StringRef, NumAArch64CPUArchs> List;
@@ -1002,6 +1006,8 @@
 }
 
 TEST(TargetParserTest, testAArch64Extension) {
+  EXPECT_FALSE(testAArch64Extension("cortex-a34",
+                                    AArch64::ArchKind::INVALID, "ras"));
   EXPECT_FALSE(testAArch64Extension("cortex-a35",
                                     AArch64::ArchKind::INVALID, "ras"));
   EXPECT_FALSE(testAArch64Extension("cortex-a53",