diff --git a/clang/lib/Basic/Targets/AArch64.h b/clang/lib/Basic/Targets/AArch64.h
--- a/clang/lib/Basic/Targets/AArch64.h
+++ b/clang/lib/Basic/Targets/AArch64.h
@@ -36,6 +36,7 @@
   bool HasFP16FML;
   bool HasMTE;
   bool HasTME;
+  bool HasLS64;
   bool HasMatMul;
   bool HasSVE2;
   bool HasSVE2AES;
@@ -80,6 +81,8 @@
                                MacroBuilder &Builder) const;
   void getTargetDefinesARMV86A(const LangOptions &Opts,
                                MacroBuilder &Builder) const;
+  void getTargetDefinesARMV87A(const LangOptions &Opts,
+                               MacroBuilder &Builder) const;
   void getTargetDefines(const LangOptions &Opts,
                         MacroBuilder &Builder) const override;
 
diff --git a/clang/lib/Basic/Targets/AArch64.cpp b/clang/lib/Basic/Targets/AArch64.cpp
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -197,6 +197,12 @@
   getTargetDefinesARMV85A(Opts, Builder);
 }
 
+void AArch64TargetInfo::getTargetDefinesARMV87A(const LangOptions &Opts,
+                                                MacroBuilder &Builder) const {
+  // Also include the Armv8.6 defines
+  getTargetDefinesARMV86A(Opts, Builder);
+}
+
 void AArch64TargetInfo::getTargetDefines(const LangOptions &Opts,
                                          MacroBuilder &Builder) const {
   // Target identification.
@@ -369,6 +375,9 @@
   case llvm::AArch64::ArchKind::ARMV8_6A:
     getTargetDefinesARMV86A(Opts, Builder);
     break;
+  case llvm::AArch64::ArchKind::ARMV8_7A:
+    getTargetDefinesARMV87A(Opts, Builder);
+    break;
   }
 
   // All of the __sync_(bool|val)_compare_and_swap_(1|2|4|8) builtins work.
@@ -407,6 +416,7 @@
   HasFP16FML = false;
   HasMTE = false;
   HasTME = false;
+  HasLS64 = false;
   HasMatMul = false;
   HasBFloat16 = false;
   HasSVE2 = false;
@@ -481,6 +491,8 @@
       ArchKind = llvm::AArch64::ArchKind::ARMV8_5A;
     if (Feature == "+v8.6a")
       ArchKind = llvm::AArch64::ArchKind::ARMV8_6A;
+    if (Feature == "+v8.7a")
+      ArchKind = llvm::AArch64::ArchKind::ARMV8_7A;
     if (Feature == "+v8r")
       ArchKind = llvm::AArch64::ArchKind::ARMV8R;
     if (Feature == "+fullfp16")
@@ -497,6 +509,8 @@
       HasMatMul = true;
     if (Feature == "+bf16")
       HasBFloat16 = true;
+    if (Feature == "+ls64")
+      HasLS64 = true;
   }
 
   setDataLayout();
diff --git a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
--- a/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/AArch64.cpp
@@ -74,9 +74,10 @@
     else
       return false;
 
-    // +sve implies +f32mm if the base architecture is v8.6A
+    // +sve implies +f32mm if the base architecture is v8.6A or v8.7A
     // it isn't the case in general that sve implies both f64mm and f32mm
-    if ((ArchKind == llvm::AArch64::ArchKind::ARMV8_6A) && Feature == "sve")
+    if ((ArchKind == llvm::AArch64::ArchKind::ARMV8_6A ||
+         ArchKind == llvm::AArch64::ArchKind::ARMV8_7A) && Feature == "sve")
       Features.push_back("+f32mm");
   }
   return true;
diff --git a/clang/test/Driver/aarch64-cpus.c b/clang/test/Driver/aarch64-cpus.c
--- a/clang/test/Driver/aarch64-cpus.c
+++ b/clang/test/Driver/aarch64-cpus.c
@@ -732,6 +732,28 @@
 // NO-F64MM-NOT: "-target-feature" "+f64mm"
 // F64MM: "-target-feature" "+f64mm"
 
+// RUN: %clang -target aarch64 -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// RUN: %clang -target aarch64 -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// RUN: %clang -target aarch64 -mlittle-endian -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// RUN: %clang -target aarch64 -mlittle-endian -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// RUN: %clang -target aarch64_be -mlittle-endian -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// RUN: %clang -target aarch64_be -mlittle-endian -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A %s
+// GENERICV87A: "-cc1"{{.*}} "-triple" "aarch64{{.*}}" "-target-cpu" "generic" "-target-feature" "+neon" "-target-feature" "+v8.7a"
+
+// RUN: %clang -target aarch64_be -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// RUN: %clang -target aarch64_be -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// RUN: %clang -target aarch64 -mbig-endian -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// RUN: %clang -target aarch64 -mbig-endian -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// RUN: %clang -target aarch64_be -mbig-endian -march=armv8.7a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// RUN: %clang -target aarch64_be -mbig-endian -march=armv8.7-a -### -c %s 2>&1 | FileCheck -check-prefix=GENERICV87A-BE %s
+// GENERICV87A-BE: "-cc1"{{.*}} "-triple" "aarch64_be{{.*}}" "-target-cpu" "generic" "-target-feature" "+neon" "-target-feature" "+v8.7a"
+
+// Tha LD64B/ST64B accelerator extension is disabled by default.
+// RUN: %clang -target aarch64 -march=armv8.7a       -### -c %s 2>&1 | FileCheck -check-prefix=NO-LS64 %s
+// RUN: %clang -target aarch64 -march=armv8.7a+ls64 -### -c %s 2>&1 | FileCheck -check-prefix=LS64 %s
+// NO-LS64-NOT: "-target-feature" "+ls64"
+// LS64: "-target-feature" "+ls64"
+
 // fullfp16 is off by default for v8a, feature must not be mentioned
 // RUN: %clang -target aarch64 -march=armv8a  -### -c %s 2>&1 | FileCheck -check-prefix=V82ANOFP16 -check-prefix=GENERIC %s
 // RUN: %clang -target aarch64 -march=armv8-a -### -c %s 2>&1 | FileCheck -check-prefix=V82ANOFP16 -check-prefix=GENERIC %s
diff --git a/clang/test/Driver/aarch64-ls64.c b/clang/test/Driver/aarch64-ls64.c
new file mode 100644
--- /dev/null
+++ b/clang/test/Driver/aarch64-ls64.c
@@ -0,0 +1,12 @@
+// Test that target feature ls64 is implemented and available correctly
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.7-a+ls64 %s 2>&1 | FileCheck %s
+// CHECK: "-target-feature" "+ls64"
+
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.7-a+nols64 %s 2>&1 | FileCheck %s --check-prefix=NO_LS64
+// NO_LS64: "-target-feature" "-ls64"
+
+// RUN: %clang -### -target aarch64-none-none-eabi                  %s 2>&1 | FileCheck %s --check-prefix=ABSENT_LS64
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.7-a %s 2>&1 | FileCheck %s --check-prefix=ABSENT_LS64
+// RUN: %clang -### -target aarch64-none-none-eabi -march=armv8.7-a %s 2>&1 | FileCheck %s --check-prefix=ABSENT_LS64
+// ABSENT_LS64-NOT: "-target-feature" "+ls64"
+// ABSENT_LS64-NOT: "-target-feature" "-ls64"
diff --git a/llvm/include/llvm/Support/AArch64TargetParser.h b/llvm/include/llvm/Support/AArch64TargetParser.h
--- a/llvm/include/llvm/Support/AArch64TargetParser.h
+++ b/llvm/include/llvm/Support/AArch64TargetParser.h
@@ -62,6 +62,7 @@
   AEK_I8MM =        1 << 30,
   AEK_F32MM =       1ULL << 31,
   AEK_F64MM =       1ULL << 32,
+  AEK_LS64 =        1ULL << 33,
 };
 
 enum class ArchKind {
diff --git a/llvm/include/llvm/Support/AArch64TargetParser.def b/llvm/include/llvm/Support/AArch64TargetParser.def
--- a/llvm/include/llvm/Support/AArch64TargetParser.def
+++ b/llvm/include/llvm/Support/AArch64TargetParser.def
@@ -51,6 +51,13 @@
               AArch64::AEK_RDM  | AArch64::AEK_RCPC | AArch64::AEK_DOTPROD |
               AArch64::AEK_SM4  | AArch64::AEK_SHA3 | AArch64::AEK_BF16    |
               AArch64::AEK_SHA2 | AArch64::AEK_AES  | AArch64::AEK_I8MM))
+AARCH64_ARCH("armv8.7-a", ARMV8_7A, "8.7-A", "v8.7a",
+             ARMBuildAttrs::CPUArch::v8_A, FK_CRYPTO_NEON_FP_ARMV8,
+             (AArch64::AEK_CRC | AArch64::AEK_FP |
+              AArch64::AEK_SIMD | AArch64::AEK_RAS | AArch64::AEK_LSE |
+              AArch64::AEK_RDM | AArch64::AEK_RCPC | AArch64::AEK_DOTPROD |
+              AArch64::AEK_SM4 | AArch64::AEK_SHA3 | AArch64::AEK_BF16 |
+              AArch64::AEK_SHA2 | AArch64::AEK_AES | AArch64::AEK_I8MM))
 AARCH64_ARCH("armv8-r", ARMV8R, "8-R", "v8r",
              ARMBuildAttrs::CPUArch::v8_R, FK_CRYPTO_NEON_FP_ARMV8,
              (AArch64::AEK_CRC     | AArch64::AEK_RDM  | AArch64::AEK_SSBS    |
@@ -99,6 +106,7 @@
 AARCH64_ARCH_EXT_NAME("f32mm",        AArch64::AEK_F32MM,       "+f32mm", "-f32mm")
 AARCH64_ARCH_EXT_NAME("f64mm",        AArch64::AEK_F64MM,       "+f64mm", "-f64mm")
 AARCH64_ARCH_EXT_NAME("tme",          AArch64::AEK_TME,         "+tme",   "-tme")
+AARCH64_ARCH_EXT_NAME("ls64",         AArch64::AEK_LS64,        "+ls64",  "-ls64")
 #undef AARCH64_ARCH_EXT_NAME
 
 #ifndef AARCH64_CPU_NAME
diff --git a/llvm/lib/Support/AArch64TargetParser.cpp b/llvm/lib/Support/AArch64TargetParser.cpp
--- a/llvm/lib/Support/AArch64TargetParser.cpp
+++ b/llvm/lib/Support/AArch64TargetParser.cpp
@@ -118,6 +118,8 @@
     Features.push_back("+v8.5a");
   if (AK == AArch64::ArchKind::ARMV8_6A)
     Features.push_back("+v8.6a");
+  if (AK == AArch64::ArchKind::ARMV8_7A)
+    Features.push_back("+v8.7a");
   if(AK == AArch64::ArchKind::ARMV8R)
     Features.push_back("+v8r");
 
diff --git a/llvm/lib/Support/ARMTargetParser.cpp b/llvm/lib/Support/ARMTargetParser.cpp
--- a/llvm/lib/Support/ARMTargetParser.cpp
+++ b/llvm/lib/Support/ARMTargetParser.cpp
@@ -154,6 +154,7 @@
       .Case("v8.4a", "v8.4-a")
       .Case("v8.5a", "v8.5-a")
       .Case("v8.6a", "v8.6-a")
+      .Case("v8.7a", "v8.7-a")
       .Case("v8r", "v8-r")
       .Case("v8m.base", "v8-m.base")
       .Case("v8m.main", "v8-m.main")
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
@@ -5384,6 +5384,7 @@
     case AArch64::ArchKind::ARMV8_4A:
     case AArch64::ArchKind::ARMV8_5A:
     case AArch64::ArchKind::ARMV8_6A:
+    case AArch64::ArchKind::ARMV8_7A:
     case AArch64::ArchKind::ARMV8R:
       RequestedExtensions.push_back("sm4");
       RequestedExtensions.push_back("sha3");
@@ -5405,6 +5406,7 @@
     case AArch64::ArchKind::ARMV8_4A:
     case AArch64::ArchKind::ARMV8_5A:
     case AArch64::ArchKind::ARMV8_6A:
+    case AArch64::ArchKind::ARMV8_7A:
       RequestedExtensions.push_back("nosm4");
       RequestedExtensions.push_back("nosha3");
       RequestedExtensions.push_back("nosha2");