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Enable RVV support in CMake and Bazel for RISC-V targets
Enable RISC-V Vector (RVV) by default when building natively on RISC-V platforms (such as SpacemiT K1/K3) using CMake and Bazel: - CMakeLists.txt: Detect riscv64 and riscv32, probe compiler support for -march=rv64gcv / -march=rv32gcv, and append architecture flags with auto-vectorization disabled (-fno-vectorize -fno-slp-vectorize). Support custom architecture flags via -DRISCV_COMPILER_FLAGS and provide -DUSE_RVV=OFF to disable. - BUILD.bazel: Add RVV_COPTS for @platforms//cpu:riscv64 and @platforms//cpu:riscv32 with -fno-vectorize. - docs/getting_started.md: Document native SBC builds, custom targets (SiFive X280, Coral 32-bit Zve32x), Bazel, and Blaze commands. Test: cmake build on host and simulated riscv64; clang cross-compile tests Bug: none Change-Id: Iecb20b73b2934b6477e7e0c71b3539a8251e4e8b TAG=agy CONV=2f28dd8a-c892-4c29-8aed-606afd090398 Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8349493 Reviewed-by: richard winterton <rrwinterton@gmail.com> Commit-Queue: Frank Barchard <fbarchard@google.com>
This commit is contained in:
Frank Barchard
libyuv-scoped@luci-project-accounts.iam.gserviceaccount.com
parent
e58eeea369
commit
af1aaca840
16
BUILD.bazel
16
BUILD.bazel
@ -56,7 +56,21 @@ PLATFORM_COPTS = select({
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"-DGOOGLE_COMMANDLINEFLAGS_FULL_API",
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]
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ALL_COPTS = PLATFORM_COPTS
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RVV_COPTS = select({
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"@platforms//cpu:riscv64": [
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"-march=rv64gcv",
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"-fno-vectorize",
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"-fno-slp-vectorize",
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],
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"@platforms//cpu:riscv32": [
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"-march=rv32gcv",
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"-fno-vectorize",
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"-fno-slp-vectorize",
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],
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"//conditions:default": [],
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})
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ALL_COPTS = PLATFORM_COPTS + RVV_COPTS
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ALL_NEON_COPTS = NEON_COPTS + PLATFORM_COPTS
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@ -139,6 +139,41 @@ int main(void) { return 0; }
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add_definitions(-DLIBYUV_DISABLE_SME)
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endif()
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endif()
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if(arch_lowercase MATCHES "^riscv")
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option(USE_RVV "Enable RISC-V Vector" ON)
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if(USE_RVV)
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if(NOT RISCV_COMPILER_FLAGS)
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if(CMAKE_SIZEOF_VOID_P EQUAL 8 OR arch_lowercase STREQUAL "riscv64")
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set(RISCV_COMPILER_FLAGS "-march=rv64gcv")
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else()
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set(RISCV_COMPILER_FLAGS "-march=rv32gcv")
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endif()
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endif()
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include(CheckCSourceCompiles)
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set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
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set(OLD_CMAKE_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${RISCV_COMPILER_FLAGS}")
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set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
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check_c_source_compiles("
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int main(void) { return 0; }
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" CAN_COMPILE_RVV)
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set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
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set(CMAKE_TRY_COMPILE_TARGET_TYPE ${OLD_CMAKE_TRY_COMPILE_TARGET_TYPE})
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if(CAN_COMPILE_RVV)
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if(NOT CMAKE_C_FLAGS MATCHES "-march=" AND NOT CMAKE_C_FLAGS MATCHES "-mcpu=")
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set(CMAKE_C_FLAGS "${RISCV_COMPILER_FLAGS} -fno-vectorize -fno-slp-vectorize ${CMAKE_C_FLAGS}")
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set(CMAKE_CXX_FLAGS "${RISCV_COMPILER_FLAGS} -fno-vectorize -fno-slp-vectorize ${CMAKE_CXX_FLAGS}")
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endif()
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else()
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add_definitions(-DLIBYUV_DISABLE_RVV)
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endif()
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else()
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add_definitions(-DLIBYUV_DISABLE_RVV)
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endif()
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endif()
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endif()
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if(LOONGARCH64)
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@ -224,7 +224,61 @@ Install cmake: http://www.cmake.org/
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## Building RISC-V target with cmake
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### Prerequisite: build risc-v clang toolchain and qemu
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### Native build on RISC-V SBC (e.g. SpacemiT K1/K3)
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On a 64-bit RISC-V system, CMake automatically detects `riscv64` and enables
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RVV with `-march=rv64gcv`:
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cmake -B out/Release -DCMAKE_BUILD_TYPE=Release -DUNIT_TEST=ON
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cmake --build out/Release
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To build for 32-bit RISC-V targets:
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cmake -B out/Release -DCMAKE_BUILD_TYPE=Release -DRISCV_COMPILER_FLAGS="-march=rv32gcv"
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cmake --build out/Release
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#### Customized Compiler Flags
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Customized compiler flags can be passed with `-DRISCV_COMPILER_FLAGS="xxx"`.
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When assigned, the specified flags are used instead of the default `-march=rv64gcv`:
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Targeting SiFive X280:
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cmake -B out/Release -DUNIT_TEST=ON \
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-DCMAKE_BUILD_TYPE=Release \
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-DRISCV_COMPILER_FLAGS="-mcpu=sifive-x280"
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Targeting Coral (32-bit without floating point, Zve32x):
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cmake -B out/Release -DUNIT_TEST=ON \
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-DCMAKE_BUILD_TYPE=Release \
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-DRISCV_COMPILER_FLAGS="-march=rv32imac_zve32x"
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To disable RVV:
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cmake -B out/Release -DCMAKE_BUILD_TYPE=Release -DUSE_RVV=OFF
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### Building RISC-V with Bazel and Blaze
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To build with Bazel for 64-bit or 32-bit RISC-V targets:
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bazel test --platforms=@platforms//cpu:riscv64 //...
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bazel test --platforms=@platforms//cpu:riscv32 //...
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For custom targets such as SiFive X280 or Coral:
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bazel test --platforms=@platforms//cpu:riscv64 --copt=-mcpu=sifive-x280 //...
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bazel test --platforms=@platforms//cpu:riscv32 --copt=-march=rv32imac_zve32x //...
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In google3 using Blaze:
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blaze test --config=mpu64 //third_party/libyuv:libyuv_test
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blaze run --config=mpu64 //third_party/libyuv:cpuid
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blaze run --config=mpu64 //third_party/libyuv:yuvconvert
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### Cross-compile for RISC-V target using QEMU
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#### Prerequisite: build risc-v clang toolchain and qemu
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If you don't have prebuilt clang and riscv64 qemu, run the script to download source and build them.
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@ -232,7 +286,7 @@ If you don't have prebuilt clang and riscv64 qemu, run the script to download so
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After running script, clang & qemu are built in `build-toolchain-qemu/riscv-clang/` & `build-toolchain-qemu/riscv-qemu/`.
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### Cross-compile for RISC-V target
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#### Cross-compile for RISC-V target
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cmake -B out/Release/ -DUNIT_TEST=ON \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_TOOLCHAIN_FILE="./riscv_script/riscv-clang.cmake" \
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@ -240,19 +294,6 @@ After running script, clang & qemu are built in `build-toolchain-qemu/riscv-clan
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-DUSE_RVV=ON .
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cmake --build out/Release/
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#### Customized Compiler Flags
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Customized compiler flags are supported by `-DRISCV_COMPILER_FLAGS="xxx"`.
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If `-DRISCV_COMPILER_FLAGS="xxx"` is manually assigned, other compile flags(e.g disable -march=xxx) will not be appended.
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Example:
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cmake -B out/Release/ -DUNIT_TEST=ON \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_TOOLCHAIN_FILE="./riscv_script/riscv-clang.cmake" \
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-DRISCV_COMPILER_FLAGS="-mcpu=sifive-x280" \
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.
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### Run on QEMU
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#### Run libyuv_unittest on QEMU
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