[x265] [PATCH v2] RISCV64:supports RISCV compile
chen
chenm003 at 163.com
Sat Oct 4 05:06:02 UTC 2025
Hi Changsheng,
This version looks good to me.
Regards,
Chen
At 2025-10-04 09:54:43, wu.changsheng at sanechips.com.cn wrote:
From 780330d5ae42a927684048363fa360414aedcd9f Mon Sep 17 00:00:00 2001
From: Changsheng Wu <wu.changsheng at sanechips.com.cn>
Date: Wed, 6 Aug 2025 01:18:13 +0800
Subject: [PATCH 1/3] RISCV64:supports RISCV compile
This patch is a basic enablement that supports RISC-V compile.
We are working on adding vector optimizations with RISC-V RVV
extensions, and will push the implementations later.
---
source/CMakeLists.txt | 98 ++++++++++++++++++++++--
source/common/CMakeLists.txt | 21 +++++
source/common/cpu.cpp | 18 +++++
source/common/param.cpp | 2 +-
source/common/primitives.cpp | 4 +-
source/common/riscv64/asm-primitives.cpp | 59 ++++++++++++++
source/common/riscv64/cpu.h | 70 +++++++++++++++++
source/test/testbench.cpp | 8 +-
source/test/testharness.h | 4 +-
source/x265.h | 3 +
10 files changed, 274 insertions(+), 13 deletions(-)
create mode 100644 source/common/riscv64/asm-primitives.cpp
create mode 100644 source/common/riscv64/cpu.h
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 4160514b9..c14489ea6 100755
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -44,11 +44,13 @@ endif()
set(X86_ALIASES x86 i386 i686 x86_64 amd64)
set(ARM_ALIASES armv6l armv7l)
set(ARM64_ALIASES arm64 arm64e aarch64)
+set(RISCV64_ALIASES riscv64)
list(FIND X86_ALIASES "${SYSPROC}" X86MATCH)
list(FIND ARM_ALIASES "${SYSPROC}" ARMMATCH)
list(FIND ARM64_ALIASES "${SYSPROC}" ARM64MATCH)
set(POWER_ALIASES powerpc64 powerpc64le ppc64 ppc64le)
list(FIND POWER_ALIASES "${SYSPROC}" POWERMATCH)
+list(FIND RISCV64_ALIASES "${SYSPROC}" RISCV64MATCH)
if(X86MATCH GREATER "-1")
set(X86 1)
add_definitions(-DX265_ARCH_X86=1)
@@ -108,6 +110,13 @@ elseif(ARM64MATCH GREATER "-1")
set(AARCH64_SVE2_FLAG "-march=armv9-a+i8mm+sve2")
# SVE2 BitPerm implies +dotprod, +sve, and +sve2.
set(AARCH64_SVE2_BITPERM_FLAG "-march=armv9-a+i8mm+sve2-bitperm")
+elseif(RISCV64MATCH GREATER "-1")
+ message(STATUS "Detected RISCV64 target processor")
+ set(RISCV64 1)
+
+ option(RISCV64_RUNTIME_CPU_DETECT "Enable RISCV64 run-time CPU feature detection" ON)
+
+ option(ENABLE_RVV "Enable RVV" ON)
else()
message(STATUS "CMAKE_SYSTEM_PROCESSOR value `${CMAKE_SYSTEM_PROCESSOR}` is unknown")
message(STATUS "Please add this value near ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE}")
@@ -171,7 +180,7 @@ if(UNIX)
endif(X64)
endif(UNIX)
-if((X64 AND NOT WIN32) OR ARM64 OR PPC64)
+if((X64 AND NOT WIN32) OR ARM64 OR PPC64 OR RISCV64)
option(ENABLE_PIC "Enable Position Independent Code" ON)
else()
option(ENABLE_PIC "Enable Position Independent Code" OFF)
@@ -440,6 +449,68 @@ int main() { return 0; }")
set(ARM_ARGS ${ARM_ARGS} -flax-vector-conversions=none)
endif()
endif()
+ if(RISCV64)
+ add_definitions(-DX265_ARCH_RISCV64=1)
+
+ if (RISCV64_RUNTIME_CPU_DETECT)
+ add_definitions(-DRISCV64_RUNTIME_CPU_DETECT=1)
+ message(STATUS "Configuring build for run-time CPU feature detection")
+ endif()
+
+ if(RISCV64_RUNTIME_CPU_DETECT OR CROSS_COMPILE_RISCV64)
+ # Add all extensions when compiling for run-time CPU feature detection or cross compiling.
+ set(CPU_HAS_RVV 1)
+ else()
+ if(CMAKE_SYSTEM_NAME MATCHES "Linux|Darwin")
+ find_package(RVV)
+ else()
+ message(STATUS "Compile-time CPU feature detection unsupported on this platform")
+ endif()
+ endif()
+
+ if(ENABLE_RVV)
+ set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
+ set(OLD_CMAKE_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
+ set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+ # When compilation target is a STATIC_LIBRARY, the LINK_OPTIONS are
+ # passed to the archiver, so we must backup, clear and restore these.
+ # https://gitlab.kitware.com/cmake/cmake/-/issues/23454
+ set(OLD_CMAKE_REQUIRED_LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
+ set(CMAKE_REQUIRED_LINK_OPTIONS "")
+
+ # Check whether the compiler can compile RVV functions that require
+ # backup/restore of RVV registers according to AAPCS.
+ # https://github.com/llvm/llvm-project/issues/80009.
+ set(RVV_COMPILATION_TEST [[
+int main() {
+ asm volatile(".option arch, +v; vsetvli t0, a0, e32, m1, ta, ma");
+ return 0;
+}]])
+
+ check_c_source_compiles("${RVV_COMPILATION_TEST}" RVV_COMPILATION_C_TEST_COMPILED)
+ check_cxx_source_compiles("${RVV_COMPILATION_TEST}" RVV_COMPILATION_CXX_TEST_COMPILED)
+
+ set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
+ set(CMAKE_TRY_COMPILE_TARGET_TYPE ${OLD_CMAKE_TRY_COMPILE_TARGET_TYPE})
+ set(CMAKE_REQUIRED_LINK_OPTIONS ${OLD_CMAKE_REQUIRED_LINK_OPTIONS})
+ if (NOT(RVV_COMPILATION_C_TEST_COMPILED AND RVV_COMPILATION_CXX_TEST_COMPILED))
+ set(ENABLE_RVV OFF CACHE BOOL "" FORCE)
+ message(STATUS "Disabling RVV")
+ endif()
+ endif()
+
+ if(NOT ENABLE_RVV)
+ message(STATUS "Disabling RVV")
+ set(CPU_HAS_RVV 0)
+ endif()
+
+ if(CPU_HAS_RVV)
+ message(STATUS "Found RVV")
+ add_definitions(-DHAVE_RVV=1)
+ endif()
+
+ set(RISCV64_ARGS -O2)
+ endif()
if(ENABLE_PIC)
list(APPEND ARM_ARGS -DPIC -fPIC)
endif()
@@ -492,7 +563,7 @@ int main() { return 0; }")
if (CC_HAS_FAST_MATH)
add_definitions(-ffast-math)
endif()
- if (NOT (ARM64 OR CROSS_COMPILE_ARM64))
+ if (NOT (ARM64 OR CROSS_COMPILE_ARM64 OR RISCV64 OR CROSS_COMPILE_RISCV64))
check_cxx_compiler_flag(-mstackrealign CC_HAS_STACK_REALIGN)
if (CC_HAS_STACK_REALIGN)
add_definitions(-mstackrealign)
@@ -548,6 +619,8 @@ if(ARM OR CROSS_COMPILE_ARM OR ARM64 OR CROSS_COMPILE_ARM64)
if (NOT ENABLE_NEON)
set(ENABLE_ASSEMBLY OFF CACHE BOOL "" FORCE)
endif()
+elseif((RISCV64 OR CROSS_COMPILE_RISCV64) AND ENABLE_RVV)
+ option(ENABLE_ASSEMBLY "Enable use of assembly coded primitives" ON)
elseif(NASM_FOUND AND X86)
if (NASM_VERSION_STRING VERSION_LESS "2.13.0")
message(STATUS "Nasm version ${NASM_VERSION_STRING} is too old. 2.13.0 or later required")
@@ -584,7 +657,7 @@ if(EXTRA_LIB)
endif(EXTRA_LIB)
mark_as_advanced(EXTRA_LIB EXTRA_LINK_FLAGS)
-if(X64 OR ARM64 OR PPC64)
+if(X64 OR ARM64 OR PPC64 OR RISCV64)
# NOTE: We only officially support high-bit-depth compiles of x265
# on 64bit architectures. Main10 plus large resolution plus slow
# preset plus 32bit address space usually means malloc failure. You
@@ -593,7 +666,7 @@ if(X64 OR ARM64 OR PPC64)
# license" so to speak. If it breaks you get to keep both halves.
# You will need to disable assembly manually.
option(HIGH_BIT_DEPTH "Store pixel samples as 16bit values (Main10/Main12)" OFF)
-endif(X64 OR ARM64 OR PPC64)
+endif(X64 OR ARM64 OR PPC64 OR RISCV64)
if(HIGH_BIT_DEPTH)
option(MAIN12 "Support Main12 instead of Main10" OFF)
if(MAIN12)
@@ -640,7 +713,7 @@ else()
endif()
add_definitions(-DX265_NS=${X265_NS})
-if(ARM64)
+if(ARM64 OR RISCV64)
if(HIGH_BIT_DEPTH)
if(MAIN12)
list(APPEND ASM_FLAGS -DHIGH_BIT_DEPTH=1 -DBIT_DEPTH=12 -DX265_NS=${X265_NS})
@@ -650,7 +723,7 @@ if(ARM64)
else()
list(APPEND ASM_FLAGS -DHIGH_BIT_DEPTH=0 -DBIT_DEPTH=8 -DX265_NS=${X265_NS})
endif()
-endif(ARM64)
+endif(ARM64 OR RISCV64)
option(WARNINGS_AS_ERRORS "Stop compiles on first warning" OFF)
if(WARNINGS_AS_ERRORS)
@@ -847,6 +920,19 @@ if((MSVC_IDE OR XCODE OR GCC) AND ENABLE_ASSEMBLY)
DEPENDS ${ASM_SRC})
endforeach()
endif()
+ elseif(RISCV64 OR CROSS_COMPILE_RISCV64)
+ # compile RISCV64 arch asm files here
+ enable_language(ASM)
+ foreach(ASM ${RISCV64_ASMS})
+ set(ASM_SRC ${CMAKE_CURRENT_SOURCE_DIR}/common/riscv64/${ASM})
+ list(APPEND ASM_SRCS ${ASM_SRC})
+ list(APPEND ASM_OBJS ${ASM}.${SUFFIX})
+ add_custom_command(
+ OUTPUT ${ASM}.${SUFFIX}
+ COMMAND ${CMAKE_CXX_COMPILER}
+ ARGS ${RISCV64_ARGS} ${ASM_FLAGS} -c ${ASM_SRC} -o ${ASM}.${SUFFIX}
+ DEPENDS ${ASM_SRC})
+ endforeach()
elseif(X86)
# compile X86 arch asm files here
foreach(ASM ${MSVC_ASMS})
diff --git a/source/common/CMakeLists.txt b/source/common/CMakeLists.txt
index 2de780931..d88c00e61 100644
--- a/source/common/CMakeLists.txt
+++ b/source/common/CMakeLists.txt
@@ -164,6 +164,27 @@ if(ENABLE_ASSEMBLY AND (ARM64 OR CROSS_COMPILE_ARM64))
endif()
endif(ENABLE_ASSEMBLY AND (ARM64 OR CROSS_COMPILE_ARM64))
+if(ENABLE_ASSEMBLY AND (RISCV64 OR CROSS_COMPILE_RISCV64))
+ if(GCC AND (CMAKE_CXX_FLAGS_RELEASE MATCHES "-O3"))
+ message(STATUS "Detected CXX compiler using -O3 optimization level")
+ add_definitions(-DAUTO_VECTORIZE=1)
+ endif()
+
+ # Add riscv64 intrinsics files here.
+ set(C_SRCS_RVV asm-primitives.cpp)
+ enable_language(ASM)
+
+ foreach(SRC ${C_SRCS_RVV})
+ set(ASM_PRIMITIVES ${ASM_PRIMITIVES} riscv64/${SRC})
+ endforeach()
+
+ source_group(Assembly FILES ${ASM_PRIMITIVES})
+
+ if(RISCV64_WARNINGS_AS_ERRORS)
+ set_source_files_properties(${ASM_PRIMITIVES} PROPERTIES COMPILE_FLAGS -Werror)
+ endif()
+endif(ENABLE_ASSEMBLY AND (RISCV64 OR CROSS_COMPILE_RISCV64))
+
if(POWER)
set_source_files_properties(version.cpp PROPERTIES COMPILE_FLAGS -DX265_VERSION=${X265_VERSION})
if(ENABLE_ALTIVEC)
diff --git a/source/common/cpu.cpp b/source/common/cpu.cpp
index 00defd837..bd16f05cc 100644
--- a/source/common/cpu.cpp
+++ b/source/common/cpu.cpp
@@ -129,6 +129,9 @@ const cpu_name_t cpu_names[] =
#elif X265_ARCH_POWER8
{ "Altivec", X265_CPU_ALTIVEC },
+#elif X265_ARCH_RISCV64
+ { "RVV", X265_CPU_RVV },
+
#endif // if X265_ARCH_X86
{ "", 0 },
};
@@ -409,6 +412,21 @@ uint32_t cpu_detect(bool benableavx512)
return flags;
}
+#elif X265_ARCH_RISCV64
+#include "riscv64/cpu.h"
+
+uint32_t cpu_detect(bool benableavx512)
+{
+ (void)benableavx512;
+ uint32_t flags = 0;
+
+#ifdef ENABLE_ASSEMBLY
+ flags = riscv64_cpu_detect();
+#endif
+
+ return flags;
+}
+
#elif X265_ARCH_POWER8
uint32_t cpu_detect(bool benableavx512)
diff --git a/source/common/param.cpp b/source/common/param.cpp
index c06862b9e..b6ed8553c 100755
--- a/source/common/param.cpp
+++ b/source/common/param.cpp
@@ -1955,7 +1955,7 @@ int x265_check_params(x265_param* param)
CHECK(param->hmeRange[level] < 0 || param->hmeRange[level] >= 32768,
"Search Range for HME levels must be between 0 and 32768");
}
-#if !X86_64 && !X265_ARCH_ARM64
+#if !X86_64 && !X265_ARCH_ARM64 && !X265_ARCH_RISCV64
CHECK(param->searchMethod == X265_SEA && (param->sourceWidth > 840 || param->sourceHeight > 480),
"SEA motion search does not support resolutions greater than 480p in 32 bit build");
#endif
diff --git a/source/common/primitives.cpp b/source/common/primitives.cpp
index 83ebc455e..55f702c7b 100644
--- a/source/common/primitives.cpp
+++ b/source/common/primitives.cpp
@@ -91,7 +91,7 @@ void setupAliasPrimitives(EncoderPrimitives &p)
/* at HIGH_BIT_DEPTH, pixel == short so we can alias many primitives */
for (int i = 0; i < NUM_CU_SIZES; i++)
{
-#if !defined(X265_ARCH_ARM64)
+#if !defined(X265_ARCH_ARM64) && !defined(X265_ARCH_RISCV64)
p.cu[i].sse_pp = (pixel_sse_t)p.cu[i].sse_ss;
#endif
@@ -260,7 +260,7 @@ void x265_setup_primitives(x265_param *param)
primitives.cu[i].intra_pred_allangs = NULL;
#if ENABLE_ASSEMBLY
-#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64)
+#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64) || defined(X265_ARCH_RISCV64)
setupIntrinsicPrimitives(primitives, param->cpuid);
#endif
setupAssemblyPrimitives(primitives, param->cpuid);
diff --git a/source/common/riscv64/asm-primitives.cpp b/source/common/riscv64/asm-primitives.cpp
new file mode 100644
index 000000000..edc04cbcd
--- /dev/null
+++ b/source/common/riscv64/asm-primitives.cpp
@@ -0,0 +1,59 @@
+/*****************************************************************************
+ * Copyright (C) 2020 MulticoreWare, Inc
+ *
+ * Authors: Changsheng Wu <wu.changsheng at sanechips.com.cn>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
+ *
+ * This program is also available under a commercial proprietary license.
+ * For more information, contact us at license @ x265.com.
+ *****************************************************************************/
+
+
+#include "common.h"
+#include "primitives.h"
+#include "x265.h"
+#include "cpu.h"
+
+#if defined(__GNUC__)
+#define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#endif
+
+namespace X265_NS
+{
+// private x265 namespace
+
+
+void setupRVVPrimitives(EncoderPrimitives &p)
+{
+}
+
+void setupAssemblyPrimitives(EncoderPrimitives &p, int cpuMask)
+{
+ if (cpuMask & X265_CPU_RVV)
+ {
+ setupRVVPrimitives(p);
+ }
+}
+
+void setupIntrinsicPrimitives(EncoderPrimitives &p, int cpuMask)
+{
+ (void)p;
+ if (cpuMask & X265_CPU_RVV)
+ {
+ }
+}
+
+} // namespace X265_NS
diff --git a/source/common/riscv64/cpu.h b/source/common/riscv64/cpu.h
new file mode 100644
index 000000000..d589e6951
--- /dev/null
+++ b/source/common/riscv64/cpu.h
@@ -0,0 +1,70 @@
+/*****************************************************************************
+ * Copyright (C) 2025 MulticoreWare, Inc
+ *
+ * Authors: Changsheng Wu <wu.changsheng at sanechips.com.cn>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
+ *
+ * This program is also available under a commercial proprietary license.
+ * For more information, contact us at license @ x265.com.
+ *****************************************************************************/
+
+#ifndef X265_COMMON_RISCV64_CPU_H
+#define X265_COMMON_RISCV64_CPU_H
+
+#include "x265.h"
+
+#if RISCV64_RUNTIME_CPU_DETECT
+
+#if defined(__linux__)
+
+#include <sys/auxv.h>
+
+#define HWCAP_RISCV64_RVV (1 << ('V' - 'A'))
+
+static inline uint32_t riscv64_cpu_detect()
+{
+ uint32_t flags = 0;
+
+ unsigned long hwcap = getauxval(AT_HWCAP);
+
+ if (hwcap & HWCAP_RISCV64_RVV)
+ flags |= X265_CPU_RVV;
+
+ return flags;
+}
+
+#else // defined(__linux__)
+#error \
+ "Run-time CPU feature detection selected, but no detection method" \
+ "available for your platform. Rerun cmake configure with" \
+ "-DRISCV64_RUNTIME_CPU_DETECT=OFF."
+#endif // defined(__linux__)
+
+#else // if AARCH64_RUNTIME_CPU_DETECT
+
+static inline uint32_t riscv64_cpu_detect()
+{
+ uint32_t flags = 0;
+
+#if HAVE_RVV
+ flags |= X265_CPU_RVV;
+#endif
+ return flags;
+}
+
+#endif // if RISCV64_RUNTIME_CPU_DETECT
+
+#endif // ifndef X265_COMMON_RISCV64_CPU_H
diff --git a/source/test/testbench.cpp b/source/test/testbench.cpp
index fb5b4252f..a93f131c0 100644
--- a/source/test/testbench.cpp
+++ b/source/test/testbench.cpp
@@ -96,7 +96,7 @@ struct test_arch_t
{ "AVX2", X265_CPU_AVX2 },
{ "BMI2", X265_CPU_AVX2 | X265_CPU_BMI1 | X265_CPU_BMI2 },
{ "AVX512", X265_CPU_AVX512 },
-#else
+#elif X265_ARCH_ARM64 || X265_ARCH_ARM
{ "ARMv6", X265_CPU_ARMV6 },
{ "NEON", X265_CPU_NEON },
{ "Neon_DotProd", X265_CPU_NEON_DOTPROD },
@@ -105,6 +105,8 @@ struct test_arch_t
{ "SVE2", X265_CPU_SVE2 },
{ "SVE2_BitPerm", X265_CPU_SVE2_BITPERM },
{ "FastNeonMRC", X265_CPU_FAST_NEON_MRC },
+#elif X265_ARCH_RISCV64
+ { "RVV", X265_CPU_RVV},
#endif
{ "", 0 },
};
@@ -226,7 +228,7 @@ int main(int argc, char *argv[])
printf("Testing primitives: %s\n", testArch[i].name);
fflush(stdout);
-#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64)
+#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64) || defined(X265_ARCH_RISCV64)
EncoderPrimitives vecprim;
memset(&vecprim, 0, sizeof(vecprim));
setupIntrinsicPrimitives(vecprim, testArch[i].flag);
@@ -268,7 +270,7 @@ int main(int argc, char *argv[])
{
EncoderPrimitives optprim;
memset(&optprim, 0, sizeof(optprim));
-#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64)
+#if defined(X265_ARCH_X86) || defined(X265_ARCH_ARM64) || defined(X265_ARCH_RISCV64)
setupIntrinsicPrimitives(optprim, cpuid);
#endif
diff --git a/source/test/testharness.h b/source/test/testharness.h
index 368c865ee..e54d05a8e 100644
--- a/source/test/testharness.h
+++ b/source/test/testharness.h
@@ -90,6 +90,8 @@ static inline uint32_t __rdtsc(void)
#elif X265_ARCH_ARM64
asm volatile("isb" : : : "memory");
asm volatile("mrs %x0, cntvct_el0" : "=r"(a));
+#elif X265_ARCH_RISCV64
+ asm volatile("rdtime %0" : "=r"(a));
#endif
return a;
}
@@ -139,7 +141,7 @@ int PFX(stack_pagealign)(int (*func)(), int align);
* needs an explicit asm check because it only sometimes crashes in normal use. */
intptr_t PFX(checkasm_call)(intptr_t (*func)(), int *ok, ...);
float PFX(checkasm_call_float)(float (*func)(), int *ok, ...);
-#elif (X265_ARCH_ARM == 0 && X265_ARCH_ARM64 == 0)
+#elif (X265_ARCH_ARM == 0 && X265_ARCH_ARM64 == 0 && X265_ARCH_RISCV64 == 0)
#define PFX(stack_pagealign)(func, align) func()
#endif
diff --git a/source/x265.h b/source/x265.h
index 31cd760e4..afd629d61 100644
--- a/source/x265.h
+++ b/source/x265.h
@@ -560,6 +560,9 @@ typedef enum
#define X265_CPU_NEON_I8MM (1 << 6) /* AArch64 Neon I8MM */
#define X265_CPU_SVE2_BITPERM (1 << 7) /* AArch64 SVE2 BitPerm */
+/* RISCV */
+#define X265_CPU_RVV (1 << 0) /* RISCV vector */
+
/* IBM Power8 */
#define X265_CPU_ALTIVEC 0x0000001
--
2.43.0
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