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add RISC-V Vector extension (RVV) kernels
Signed-off-by: Olaf Bernstein <[email protected]>
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‎.github/workflows/run-tests-rvv.yml‎

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#
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# Copyright 2020 - 2022 Free Software Foundation, Inc.
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#
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# This file is part of VOLK
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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#
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name: Run VOLK tests on different RVV configurations
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on: [push, pull_request]
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jobs:
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Tests:
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runs-on: ubuntu-24.04
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steps:
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- uses: actions/checkout@v4
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- name: Install packages
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run: |
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git submodule update --init --recursive
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sudo apt-get update -q -y
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sudo apt-get install -y python3-mako cmake qemu-user-static g++-14-riscv64-linux-gnu clang-18
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mkdir build
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cd build
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- name: Test gcc-14 VLEN=128
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run: |
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cd build; rm -rf *
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CXX=riscv64-linux-gnu-g++-14 CC=riscv64-linux-gnu-gcc-14 VLEN=128 \
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cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/rv64gcv-linux-gnu.cmake ..
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make -j$(nproc)
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ARGS=-j$(nproc) make test
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- name: Test gcc-14 VLEN=256
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run: |
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cd build; rm -rf *
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CXX=riscv64-linux-gnu-g++-14 CC=riscv64-linux-gnu-gcc-14 VLEN=256 \
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cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/rv64gcv-linux-gnu.cmake .. -DCMAKE_BUILD_TYPE=Release
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make -j$(nproc)
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ARGS=-j$(nproc) make test
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- name: Test clang-18 VLEN=512
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run: |
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cd build; rm -rf *
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CXX=clang++-18 CC=clang-18 CFLAGS=--target=riscv64-linux-gnu VLEN=512 \
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cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/rv64gcv-linux-gnu.cmake ..
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make -j$(nproc)
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ARGS=-j$(nproc) make test
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- name: Test clang-18 VLEN=1024
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run: |
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cd build; rm -rf *
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CXX=clang++-18 CC=clang-18 CFLAGS=--target=riscv64-linux-gnu VLEN=1024 \
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cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/rv64gcv-linux-gnu.cmake .. -DCMAKE_BUILD_TYPE=Release
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make -j$(nproc)
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ARGS=-j$(nproc) make test
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‎cmake/Checks/check-rvv-intrinsics.c‎

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#if (__riscv_v_intrinsic >= 1000000 || __clang_major__ >= 18 || __GNUC__ >= 14)
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int main() { return 0; }
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#else
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#error "rvv intrinsics aren't supported"
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#endif

‎cmake/Toolchains/rv64gcv-linux-gnu.cmake‎

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#
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# Copyright 2024 Free Software Foundation, Inc.
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#
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# This file is part of VOLK
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#
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# SPDX-License-Identifier: LGPL-3.0-or-later
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#
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set(CMAKE_SYSTEM_NAME Linux)
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set(CMAKE_SYSTEM_PROCESSOR riscv64)
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set(CMAKE_C_COMPILER $ENV{CC})
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set(CMAKE_ASM_COMPILER ${CMAKE_C_COMPILER})
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set(CMAKE_CXX_COMPILER $ENV{CXX})
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set(CMAKE_C_FLAGS "$ENV{CFLAGS} -march=rv64gcv" CACHE STRING "" FORCE)
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set(CMAKE_CXX_FLAGS ${CMAKE_C_FLAGS} CACHE STRING "" FORCE)
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set(CMAKE_ASM_FLAGS "${CMAKE_C_FLAGS} -g" CACHE STRING "" FORCE)
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set(CMAKE_OBJCOPY
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${RISCV64_TOOLCHAIN_DIR}/${TOOLCHAIN_PREFIX}objcopy
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CACHE INTERNAL "objcopy tool")
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set(CMAKE_SIZE_UTIL
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${RISCV64_TOOLCHAIN_DIR}/${TOOLCHAIN_PREFIX}size
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CACHE INTERNAL "size tool")
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set(CMAKE_FIND_ROOT_PATH ${BINUTILS_PATH})
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set(QEMU_VLEN $ENV{VLEN})
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if(NOT QEMU_VLEN)
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set(QEMU_VLEN "128")
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endif()
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set(CMAKE_CROSSCOMPILING_EMULATOR "qemu-riscv64-static -L /usr/riscv64-linux-gnu/ -cpu rv64,zba=true,zbb=true,v=on,vlen=${QEMU_VLEN},rvv_ta_all_1s=on,rvv_ma_all_1s=on")

‎gen/archs.xml‎

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@@ -181,4 +181,48 @@ at the top, as a last resort.
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<arch name="riscv64">
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</arch>
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<!-->
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tmpl/ currently assumes that every arch.name starting with "rv" requires
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RVV intrinsics
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</-->
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<!-->
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There is currently no mechanism in RISC-V to append extensions,
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so each arch needs to specify all of them, and the order needs in the
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machine definition needs to be from the fewest to the most extensions.
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Fortunately, this maps quite well to the profiles concept.
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</-->
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<arch name="rvv">
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<check name="V"></check>
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<flag compiler="gnu">-march=rv64gcv</flag>
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<flag compiler="clang">-march=rv64gcv</flag>
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</arch>
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<arch name="rvvseg">
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<check name="V"></check>
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<flag compiler="gnu">-march=rv64gcv</flag>
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<flag compiler="clang">-march=rv64gcv</flag>
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<!-->
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It's unclear how performance portable segmented load/stores are, so the
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default rvv implementations avoid using them.
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This is a pseudo arch for separate segmented load/store implementations,
208+
and is expected to never be used standalone without "rvv".
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</-->
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</arch>
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<!-->
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google/cpu_features currently doesn't support these extensions and profiles.
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</-->
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<!--arch name="rva22v">
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<check name="V"></check>
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<check name="B"></check>
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<flag compiler="gnu">-march=rv64gcv_zba_zbb_zbs</flag>
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<flag compiler="clang">-march=rv64gcv_zba_zbb_zbs</flag>
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</arch-->
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<!--arch name="rva23">
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<check name="rva23"></check>
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<flag compiler="gnu">-march=rva23u64</flag>
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<flag compiler="clang">-march=rva23u64</flag>
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</arch-->
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</grammar>

‎gen/machines.xml‎

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<archs>generic riscv64 orc|</archs>
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</machine>
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<machine name="rv64gcv">
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<archs>generic riscv64 rvv rvvseg orc|</archs>
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</machine>
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<!--machine name="rva22v">
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<archs>generic riscv64 rvv rvvseg rva22v orc|</archs>
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</machine-->
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<!--machine name="rva23">
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<archs>generic riscv64 rvv rvvseg rva22v rva23 orc|</archs>
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</machine-->
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<machine name="sse4_a">
3749
<archs>generic 32|64| mmx| sse sse2 sse3 sse4_a popcount orc|</archs>
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</machine>

‎include/volk/volk_rvv_intrinsics.h‎

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/* -*- c++ -*- */
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/*
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* Copyright 2024 Free Software Foundation, Inc.
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*
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* This file is part of VOLK
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*
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* SPDX-License-Identifier: LGPL-3.0-or-later
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*/
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/*
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* This file is intended to hold RVV intrinsics of intrinsics.
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* They should be used in VOLK kernels to avoid copy-paste.
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*/
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#ifndef INCLUDE_VOLK_VOLK_RVV_INTRINSICS_H_
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#define INCLUDE_VOLK_VOLK_RVV_INTRINSICS_H_
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#include <riscv_vector.h>
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#define RISCV_SHRINK2(op, T, S, v) \
20+
__riscv_##op(__riscv_vget_##T##S##m1(v, 0), \
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__riscv_vget_##T##S##m1(v, 1), \
22+
__riscv_vsetvlmax_e##S##m1())
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#define RISCV_SHRINK4(op, T, S, v) \
25+
__riscv_##op(__riscv_##op(__riscv_vget_##T##S##m1(v, 0), \
26+
__riscv_vget_##T##S##m1(v, 1), \
27+
__riscv_vsetvlmax_e##S##m1()), \
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__riscv_##op(__riscv_vget_##T##S##m1(v, 2), \
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__riscv_vget_##T##S##m1(v, 3), \
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__riscv_vsetvlmax_e##S##m1()), \
31+
__riscv_vsetvlmax_e##S##m1())
32+
33+
#define RISCV_SHRINK8(op, T, S, v) \
34+
__riscv_##op(__riscv_##op(__riscv_##op(__riscv_vget_##T##S##m1(v, 0), \
35+
__riscv_vget_##T##S##m1(v, 1), \
36+
__riscv_vsetvlmax_e##S##m1()), \
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__riscv_##op(__riscv_vget_##T##S##m1(v, 2), \
38+
__riscv_vget_##T##S##m1(v, 3), \
39+
__riscv_vsetvlmax_e##S##m1()), \
40+
__riscv_vsetvlmax_e##S##m1()), \
41+
__riscv_##op(__riscv_##op(__riscv_vget_##T##S##m1(v, 4), \
42+
__riscv_vget_##T##S##m1(v, 5), \
43+
__riscv_vsetvlmax_e##S##m1()), \
44+
__riscv_##op(__riscv_vget_##T##S##m1(v, 6), \
45+
__riscv_vget_##T##S##m1(v, 7), \
46+
__riscv_vsetvlmax_e##S##m1()), \
47+
__riscv_vsetvlmax_e##S##m1()), \
48+
__riscv_vsetvlmax_e##S##m1())
49+
50+
#define RISCV_PERM4(f, v, vidx) \
51+
__riscv_vcreate_v_u8m1_u8m4( \
52+
f(__riscv_vget_u8m1(v, 0), vidx, __riscv_vsetvlmax_e8m1()), \
53+
f(__riscv_vget_u8m1(v, 1), vidx, __riscv_vsetvlmax_e8m1()), \
54+
f(__riscv_vget_u8m1(v, 2), vidx, __riscv_vsetvlmax_e8m1()), \
55+
f(__riscv_vget_u8m1(v, 3), vidx, __riscv_vsetvlmax_e8m1()))
56+
57+
#define RISCV_LUT4(f, vtbl, v) \
58+
__riscv_vcreate_v_u8m1_u8m4( \
59+
f(vtbl, __riscv_vget_u8m1(v, 0), __riscv_vsetvlmax_e8m1()), \
60+
f(vtbl, __riscv_vget_u8m1(v, 1), __riscv_vsetvlmax_e8m1()), \
61+
f(vtbl, __riscv_vget_u8m1(v, 2), __riscv_vsetvlmax_e8m1()), \
62+
f(vtbl, __riscv_vget_u8m1(v, 3), __riscv_vsetvlmax_e8m1()))
63+
64+
#define RISCV_PERM8(f, v, vidx) \
65+
__riscv_vcreate_v_u8m1_u8m8( \
66+
f(__riscv_vget_u8m1(v, 0), vidx, __riscv_vsetvlmax_e8m1()), \
67+
f(__riscv_vget_u8m1(v, 1), vidx, __riscv_vsetvlmax_e8m1()), \
68+
f(__riscv_vget_u8m1(v, 2), vidx, __riscv_vsetvlmax_e8m1()), \
69+
f(__riscv_vget_u8m1(v, 3), vidx, __riscv_vsetvlmax_e8m1()), \
70+
f(__riscv_vget_u8m1(v, 4), vidx, __riscv_vsetvlmax_e8m1()), \
71+
f(__riscv_vget_u8m1(v, 5), vidx, __riscv_vsetvlmax_e8m1()), \
72+
f(__riscv_vget_u8m1(v, 6), vidx, __riscv_vsetvlmax_e8m1()), \
73+
f(__riscv_vget_u8m1(v, 7), vidx, __riscv_vsetvlmax_e8m1()))
74+
75+
#define RISCV_VMFLTZ(T, v, vl) __riscv_vmslt(__riscv_vreinterpret_i##T(v), 0, vl)
76+
77+
#endif /* INCLUDE_VOLK_VOLK_RVV_INTRINSICS_H_ */

‎kernels/volk/volk_16i_32fc_dot_prod_32fc.h‎

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@@ -668,5 +668,66 @@ static inline void volk_16i_32fc_dot_prod_32fc_a_avx2_fma(lv_32fc_t* result,
668668

669669
#endif /*LV_HAVE_AVX2 && LV_HAVE_FMA*/
670670

671+
#ifdef LV_HAVE_RVV
672+
#include <riscv_vector.h>
673+
#include <volk/volk_rvv_intrinsics.h>
674+
675+
static inline void volk_16i_32fc_dot_prod_32fc_rvv(lv_32fc_t* result,
676+
const short* input,
677+
const lv_32fc_t* taps,
678+
unsigned int num_points)
679+
{
680+
vfloat32m4_t vsumr = __riscv_vfmv_v_f_f32m4(0, __riscv_vsetvlmax_e32m4());
681+
vfloat32m4_t vsumi = vsumr;
682+
size_t n = num_points;
683+
for (size_t vl; n > 0; n -= vl, input += vl, taps += vl) {
684+
vl = __riscv_vsetvl_e32m4(n);
685+
vuint64m8_t vc = __riscv_vle64_v_u64m8((const uint64_t*)taps, vl);
686+
vfloat32m4_t vr = __riscv_vreinterpret_f32m4(__riscv_vnsrl(vc, 0, vl));
687+
vfloat32m4_t vi = __riscv_vreinterpret_f32m4(__riscv_vnsrl(vc, 32, vl));
688+
vfloat32m4_t v =
689+
__riscv_vfwcvt_f(__riscv_vle16_v_i16m2((const int16_t*)input, vl), vl);
690+
vsumr = __riscv_vfmacc_tu(vsumr, vr, v, vl);
691+
vsumi = __riscv_vfmacc_tu(vsumi, vi, v, vl);
692+
}
693+
size_t vl = __riscv_vsetvlmax_e32m1();
694+
vfloat32m1_t vr = RISCV_SHRINK4(vfadd, f, 32, vsumr);
695+
vfloat32m1_t vi = RISCV_SHRINK4(vfadd, f, 32, vsumi);
696+
vfloat32m1_t z = __riscv_vfmv_s_f_f32m1(0, vl);
697+
*result = lv_cmake(__riscv_vfmv_f(__riscv_vfredusum(vr, z, vl)),
698+
__riscv_vfmv_f(__riscv_vfredusum(vi, z, vl)));
699+
}
700+
#endif /*LV_HAVE_RVV*/
701+
702+
#ifdef LV_HAVE_RVVSEG
703+
#include <riscv_vector.h>
704+
#include <volk/volk_rvv_intrinsics.h>
705+
706+
static inline void volk_16i_32fc_dot_prod_32fc_rvvseg(lv_32fc_t* result,
707+
const short* input,
708+
const lv_32fc_t* taps,
709+
unsigned int num_points)
710+
{
711+
vfloat32m4_t vsumr = __riscv_vfmv_v_f_f32m4(0, __riscv_vsetvlmax_e32m4());
712+
vfloat32m4_t vsumi = vsumr;
713+
size_t n = num_points;
714+
for (size_t vl; n > 0; n -= vl, input += vl, taps += vl) {
715+
vl = __riscv_vsetvl_e32m4(n);
716+
vfloat32m4x2_t vc = __riscv_vlseg2e32_v_f32m4x2((const float*)taps, vl);
717+
vfloat32m4_t vr = __riscv_vget_f32m4(vc, 0);
718+
vfloat32m4_t vi = __riscv_vget_f32m4(vc, 1);
719+
vfloat32m4_t v =
720+
__riscv_vfwcvt_f(__riscv_vle16_v_i16m2((const int16_t*)input, vl), vl);
721+
vsumr = __riscv_vfmacc_tu(vsumr, vr, v, vl);
722+
vsumi = __riscv_vfmacc_tu(vsumi, vi, v, vl);
723+
}
724+
size_t vl = __riscv_vsetvlmax_e32m1();
725+
vfloat32m1_t vr = RISCV_SHRINK4(vfadd, f, 32, vsumr);
726+
vfloat32m1_t vi = RISCV_SHRINK4(vfadd, f, 32, vsumi);
727+
vfloat32m1_t z = __riscv_vfmv_s_f_f32m1(0, vl);
728+
*result = lv_cmake(__riscv_vfmv_f(__riscv_vfredusum(vr, z, vl)),
729+
__riscv_vfmv_f(__riscv_vfredusum(vi, z, vl)));
730+
}
731+
#endif /*LV_HAVE_RVVSEG*/
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672733
#endif /*INCLUDED_volk_16i_32fc_dot_prod_32fc_H*/

‎kernels/volk/volk_16i_branch_4_state_8.h‎

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1010
/*!
1111
* \page volk_16i_branch_4_state_8
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*
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* \b Deprecation
14+
*
15+
* This kernel is deprecated.
16+
*
1317
* \b Overview
1418
*
1519
* <FIXME>

‎kernels/volk/volk_16i_convert_8i.h‎

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@@ -275,5 +275,20 @@ static inline void volk_16i_convert_8i_neon(int8_t* outputVector,
275275
}
276276
#endif /* LV_HAVE_NEON */
277277

278+
#ifdef LV_HAVE_RVV
279+
#include <riscv_vector.h>
280+
281+
static inline void volk_16i_convert_8i_rvv(int8_t* outputVector,
282+
const int16_t* inputVector,
283+
unsigned int num_points)
284+
{
285+
size_t n = num_points;
286+
for (size_t vl; n > 0; n -= vl, inputVector += vl, outputVector += vl) {
287+
vl = __riscv_vsetvl_e16m8(n);
288+
vint16m8_t v = __riscv_vle16_v_i16m8(inputVector, vl);
289+
__riscv_vse8(outputVector, __riscv_vnsra(v, 8, vl), vl);
290+
}
291+
}
292+
#endif /*LV_HAVE_RVV*/
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279294
#endif /* INCLUDED_volk_16i_convert_8i_a_H */

‎kernels/volk/volk_16i_max_star_16i.h‎

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/*!
1111
* \page volk_16i_max_star_16i
1212
*
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* \b Deprecation
14+
*
15+
* This kernel is deprecated.
16+
*
1317
* \b Overview
1418
*
1519
* <FIXME>

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