diff --git a/CMakeLists.txt b/CMakeLists.txt

index 7e6c6e989..6c4fed042 100644

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -90,6 +90,8 @@ elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")

     set(WTF_CPU_S390X 1)

 elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64")

     set(WTF_CPU_RISCV64 1)

+elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "loongarch64")

+    set(WTF_CPU_LOONGARCH64 1)

 else ()

     message(FATAL_ERROR "Unknown CPU '${LOWERCASE_CMAKE_SYSTEM_PROCESSOR}'")

 endif ()

diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt

index 83b0f399c..a439444ef 100644

--- a/Source/JavaScriptCore/CMakeLists.txt

+++ b/Source/JavaScriptCore/CMakeLists.txt

@@ -1280,6 +1280,7 @@ if (WTF_CPU_ARM)

 elseif (WTF_CPU_ARM64)

 elseif (WTF_CPU_ALPHA)

 elseif (WTF_CPU_HPPA)

+elseif (WTF_CPU_LOONGARCH64)

 elseif (WTF_CPU_PPC)

 elseif (WTF_CPU_PPC64)

 elseif (WTF_CPU_PPC64LE)

diff --git a/Source/ThirdParty/ANGLE/src/common/mathutil.h b/Source/ThirdParty/ANGLE/src/common/mathutil.h

index 7959da8bd..c86afd61e 100644

--- a/Source/ThirdParty/ANGLE/src/common/mathutil.h

+++ b/Source/ThirdParty/ANGLE/src/common/mathutil.h

@@ -16,6 +16,7 @@

 #include <algorithm>

 #include <string.h>

 #include <stdlib.h>

+#include <cstdint>

 namespace gl

 {

diff --git a/Source/ThirdParty/brotli/dec/port.h b/Source/ThirdParty/brotli/dec/port.h

index 54f51b010..e6da12d35 100644

--- a/Source/ThirdParty/brotli/dec/port.h

+++ b/Source/ThirdParty/brotli/dec/port.h

@@ -60,6 +60,10 @@

 #define BROTLI_TARGET_RISCV64

 #endif

+#if defined(__loongarch64)

+#define BROTLI_TARGET_LOONGARCH64

+#endif

+

 #ifdef BROTLI_BUILD_PORTABLE

 #define BROTLI_ALIGNED_READ (!!1)

 #elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \

@@ -100,6 +104,7 @@ static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) {

 #elif defined(BROTLI_BUILD_32_BIT)

 #define BROTLI_64_BITS 0

 #elif defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8) || \

+    defined(BROTLI_TARGET_LOONGARCH64) || \

     defined(BROTLI_TARGET_POWERPC64) || defined(BROTLI_TARGET_RISCV64)

 #define BROTLI_64_BITS 1

 #else

diff --git a/Source/WTF/wtf/Platform.h b/Source/WTF/wtf/Platform.h

index 7aefa1bab..224bd5ac7 100644

--- a/Source/WTF/wtf/Platform.h

+++ b/Source/WTF/wtf/Platform.h

@@ -176,6 +176,11 @@

 #define WTF_CPU_X86_SSE2 1

 #endif

+/* CPU(LOONGARCH64) - LoongArch */

+#if defined(__loongarch64)

+#define WTF_CPU_LOONGARCH64 1

+#endif

+

 /* CPU(RISCV64) - RISCV64 */

 #if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64

 #define WTF_CPU_RISCV64 1

@@ -710,6 +715,7 @@

     || CPU(ALPHA) \

     || CPU(ARM64) \

     || CPU(S390X) \

+    || CPU(LOONGARCH64) \

     || CPU(MIPS64) \

     || CPU(PPC64) \

     || CPU(PPC64LE) \

diff --git a/Source/WTF/wtf/dtoa/utils.h b/Source/WTF/wtf/dtoa/utils.h

index 176d5909f..b13616295 100644

--- a/Source/WTF/wtf/dtoa/utils.h

+++ b/Source/WTF/wtf/dtoa/utils.h

@@ -49,7 +49,7 @@

 defined(__ARMEL__) || \

 defined(_MIPS_ARCH_MIPS32R2)

 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1

-#elif CPU(MIPS) || CPU(MIPS64) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA) || CPU(RISCV64)

+#elif CPU(MIPS) || CPU(MIPS64) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA) || CPU(LOONGARCH64) || CPU(RISCV64)

 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1

 #elif defined(_M_IX86) || defined(__i386__)

 #if defined(_WIN32)

diff --git a/Tools/Scripts/webkitdirs.pm b/Tools/Scripts/webkitdirs.pm

index 4a075d41c..5932fed69 100755

--- a/Tools/Scripts/webkitdirs.pm

+++ b/Tools/Scripts/webkitdirs.pm

@@ -1264,6 +1264,11 @@ sub isARM()

     return ($Config{archname} =~ /^arm[v\-]/) || ($Config{archname} =~ /^aarch64[v\-]/);

 }

+sub isLOONGARCH()

+{

+    return ($Config{archname} =~ /^loongarch64\-/);

+}

+

 sub isRISCV()

 {

     return ($Config{archname} =~ /^riscv(|32|64)\-/);