From d9824ec806b6c6171862a7ba758fc28e6a20aada Mon Sep 17 00:00:00 2001
From: Dmitry Shachnev <mitya57@gmail.com>
Date: Tue, 14 Apr 2020 13:51:37 +0300
Subject: [PATCH] Add support for RISC-V 64-bit architecture

---
 CMakeLists.txt                       | 2 ++
 Source/JavaScriptCore/CMakeLists.txt | 1 +
 Source/WTF/wtf/Platform.h            | 8 +++++++-
 Source/WTF/wtf/dtoa/utils.h          | 2 +-
 4 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 432ae6fce7016..eaf3a35dfd5b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,6 +83,8 @@ elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "s390")
     set(WTF_CPU_S390 1)
 elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "s390x")
     set(WTF_CPU_S390X 1)
+elseif (LOWERCASE_CMAKE_SYSTEM_PROCESSOR MATCHES "riscv64")
+    set(WTF_CPU_RISCV64 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 afd76ca1a1844..3d184090dce76 100644
--- a/Source/JavaScriptCore/CMakeLists.txt
+++ b/Source/JavaScriptCore/CMakeLists.txt
@@ -1287,6 +1287,7 @@ elseif (WTF_CPU_S390)
 elseif (WTF_CPU_S390X)
 elseif (WTF_CPU_MIPS)
 elseif (WTF_CPU_SH4)
+elseif (WTF_CPU_RISCV64)
 elseif (WTF_CPU_X86)
 elseif (WTF_CPU_X86_64)
     if (MSVC AND ENABLE_JIT)
diff --git a/Source/WTF/wtf/Platform.h b/Source/WTF/wtf/Platform.h
index 5717f3ea1664e..7aefa1bab50dc 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(RISCV64) - RISCV64 */
+#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64
+#define WTF_CPU_RISCV64 1
+#endif
+
 /* CPU(ARM64) - Apple */
 #if (defined(__arm64__) && defined(__APPLE__)) || defined(__aarch64__)
 #define WTF_CPU_ARM64 1
@@ -707,7 +712,8 @@
     || CPU(S390X) \
     || CPU(MIPS64) \
     || CPU(PPC64) \
-    || CPU(PPC64LE)
+    || CPU(PPC64LE) \
+    || CPU(RISCV64)
 #define USE_JSVALUE64 1
 #else
 #define USE_JSVALUE32_64 1
diff --git a/Source/WTF/wtf/dtoa/utils.h b/Source/WTF/wtf/dtoa/utils.h
index 889642cee7226..176d5909f7d32 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)
+#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)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)
 #if defined(_WIN32)