From 647e67b23883960fef8890465c0f70d7ab6e63f1 Mon Sep 17 00:00:00 2001
From: zhaixiang <zhaixiang@loongson.cn>
Date: Sun, 4 Sep 2022 20:56:30 -0700
Subject: [PATCH] Initial Linux/LoongArch64 Port
 https://bugs.webkit.org/show_bug.cgi?id=244664

Reviewed by Michael Catanzaro.

* Source/JavaScriptCore/CMakeLists.txt:
* Source/WTF/wtf/PageBlock.h:
* Source/WTF/wtf/PlatformCPU.h:
* Source/WTF/wtf/dtoa/utils.h:
* Source/cmake/WebKitCommon.cmake:

Canonical link: https://commits.webkit.org/254155@main
---
 Source/JavaScriptCore/CMakeLists.txt | 6 +++++-
 Source/WTF/wtf/PageBlock.h           | 2 +-
 Source/WTF/wtf/PlatformCPU.h         | 6 ++++++
 Source/WTF/wtf/dtoa/utils.h          | 1 +
 Source/cmake/WebKitCommon.cmake      | 2 ++
 5 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Source/JavaScriptCore/CMakeLists.txt b/Source/JavaScriptCore/CMakeLists.txt
index 033a85b20858..f4919e6e8523 100644
--- a/Source/JavaScriptCore/CMakeLists.txt
+++ b/Source/JavaScriptCore/CMakeLists.txt
@@ -1436,7 +1436,11 @@ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
 if (COMPILER_IS_GCC_OR_CLANG)
     # Avoid using fused multiply-add instructions since this could give different results
     # for e.g. parseInt depending on the platform and compilation flags.
-    WEBKIT_ADD_TARGET_CXX_FLAGS(JavaScriptCore -ffp-contract=off -fno-slp-vectorize)
+    if (WTF_CPU_LOONGARCH64)
+        WEBKIT_ADD_TARGET_CXX_FLAGS(JavaScriptCore -ffp-contract=off)
+    else ()
+        WEBKIT_ADD_TARGET_CXX_FLAGS(JavaScriptCore -ffp-contract=off -fno-slp-vectorize)
+    endif ()
 
     # On MIPS we have to explicitly disable madd4, since some versions of gcc still generate
     # such instructions despite -ffp-contract=off
diff --git a/Source/WTF/wtf/PageBlock.h b/Source/WTF/wtf/PageBlock.h
index 37796c0cedd3..4c73f5abe2f4 100644
--- a/Source/WTF/wtf/PageBlock.h
+++ b/Source/WTF/wtf/PageBlock.h
@@ -49,7 +49,7 @@ namespace WTF {
 // aarch64 by default. USE(64KB_PAGE_BLOCK) allows overriding this.
 //
 // Use 64 KiB for any unknown CPUs to be conservative.
-#if OS(DARWIN) || PLATFORM(PLAYSTATION) || CPU(MIPS) || CPU(MIPS64) || (OS(LINUX) && CPU(ARM64) && !USE(64KB_PAGE_BLOCK))
+#if OS(DARWIN) || PLATFORM(PLAYSTATION) || CPU(MIPS) || CPU(MIPS64) || CPU(LOONGARCH64) || (OS(LINUX) && CPU(ARM64) && !USE(64KB_PAGE_BLOCK))
 constexpr size_t CeilingOnPageSize = 16 * KB;
 #elif USE(64KB_PAGE_BLOCK) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || CPU(UNKNOWN)
 constexpr size_t CeilingOnPageSize = 64 * KB;
diff --git a/Source/WTF/wtf/PlatformCPU.h b/Source/WTF/wtf/PlatformCPU.h
index 238334178676..58cf04f4d788 100644
--- a/Source/WTF/wtf/PlatformCPU.h
+++ b/Source/WTF/wtf/PlatformCPU.h
@@ -55,6 +55,12 @@
 #define WTF_MIPS_FP64 (defined __mips_fpr && __mips_fpr == 64)
 #endif
 
+/* CPU(LOONGARCH64) - LOONGARCH64 */
+#if defined(__loongarch64)
+#define WTF_CPU_LOONGARCH64 1
+#define WTF_CPU_KNOWN 1
+#endif
+
 /* CPU(PPC64) - PowerPC 64-bit Big Endian */
 #if (  defined(__ppc64__)      \
     || defined(__PPC64__))     \
diff --git a/Source/WTF/wtf/dtoa/utils.h b/Source/WTF/wtf/dtoa/utils.h
index 96d5bd7b5568..aa0786de10cb 100644
--- a/Source/WTF/wtf/dtoa/utils.h
+++ b/Source/WTF/wtf/dtoa/utils.h
@@ -83,6 +83,7 @@ int main(int argc, char** argv) {
     defined(__ARMEL__) || defined(__avr32__) || defined(_M_ARM) || defined(_M_ARM64) || \
     defined(__hppa__) || defined(__ia64__) || \
     defined(__mips__) || \
+    defined(__loongarch__) || \
     defined(__powerpc__) || defined(__ppc__) || defined(__ppc64__) || \
     defined(_POWER) || defined(_ARCH_PPC) || defined(_ARCH_PPC64) || \
     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
diff --git a/Source/cmake/WebKitCommon.cmake b/Source/cmake/WebKitCommon.cmake
index 4cf232376155..bbf4b25f6df5 100644
--- a/Source/cmake/WebKitCommon.cmake
+++ b/Source/cmake/WebKitCommon.cmake
@@ -119,6 +119,8 @@ if (NOT HAS_RUN_WEBKIT_COMMON)
         set(WTF_CPU_PPC64LE 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 ()
         set(WTF_CPU_UNKNOWN 1)
     endif ()