update doc

CMakeLists.txt

@@ -419,11 +419,6 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(riscv)")
     set(NCNN_TARGET_ARCH riscv)
 
     if(CMAKE_SIZEOF_VOID_P EQUAL 8)
-        check_cxx_source_compiles("#if __riscv_v == 7000\nint main() { return 0; }\n#endif\n" NCNN_COMPILER_IS_XUANTIE_GCC)
-        if(NCNN_COMPILER_IS_XUANTIE_GCC)
-            message(WARNING "Since XuanTie GCC Toolchain is not yet ready for RVV1.0, the risc-v optimized code of ncnn has been migrated to the RVV1.0 standard. Please use the old version of ncnn, which can be found at https://github.com/Tencent/ncnn/releases/download/20240820/ncnn-20240820-full-source.zip")
-        endif()
-
         set(CMAKE_REQUIRED_FLAGS "-march=rv64gcv")
         check_cxx_source_compiles("#include <riscv_vector.h>\nint main() { vfloat32m8_t _s, _w; float _v; size_t vl; _s = __riscv_vfmacc_vf_f32m8(_s, _v, _w, vl); vfloat32m1_t _x; vfloat32m1x2_t _xx = __riscv_vcreate_v_f32m1x2(_x, _x); return 0; }" NCNN_COMPILER_SUPPORT_RISCV_V)
 
@@ -434,7 +429,7 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(riscv)")
         check_cxx_source_compiles("#include <riscv_vector.h>\nint main() { vfloat16m8_t _s, _w; __fp16 _v; size_t vl; _s = __riscv_vfmacc_vf_f16m8(_s, _v, _w, vl); return 0; }" NCNN_COMPILER_SUPPORT_RISCV_ZVFH)
 
         set(CMAKE_REQUIRED_FLAGS "-march=rv64gc_zfh_xtheadvector -D__fp16=_Float16")
-        check_cxx_source_compiles("#include <riscv_vector.h>\nint main() { vfloat16m8_t _s, _w; __fp16 _v; size_t vl; _s = __riscv_vfmacc_vf_f16m8(_s, _v, _w, vl); return 0; }" NCNN_COMPILER_SUPPORT_RISCV_XTHEADVECTOR)
+        check_cxx_source_compiles("#include <riscv_vector.h>\nint main() { vfloat16m8_t _s, _w; __fp16 _v; size_t vl; _s = __riscv_vfmacc_vf_f16m8(_s, _v, _w, vl); vfloat32m1_t _x; vfloat32m1x2_t _xx = __riscv_vcreate_v_f32m1x2(_x, _x); return 0; }" NCNN_COMPILER_SUPPORT_RISCV_XTHEADVECTOR)
 
         unset(CMAKE_REQUIRED_FLAGS)
 

docs/how-to-build/how-to-build.md

@@ -667,23 +667,19 @@ Pick `build-XYZ/install` folder for further usage.
 
 ### Build for AllWinner D1
 
-**Important Note**
-
-Since XuanTie GCC Toolchain is not yet ready for RVV1.0, the RISC-V optimized code of ncnn has been migrated to the RVV1.0 standard. The compilation process here uses the old version of ncnn, which can be found at https://github.com/Tencent/ncnn/releases/download/20240820/ncnn-20240820-full-source.zip
-
-Download c906 toolchain package from https://xuantie.t-head.cn/community/download?id=4224193099938729984
+Download c906 toolchain package from https://www.xrvm.cn/community/download?id=4382928864901402624
 
 ```shell
-tar -xf Xuantie-900-gcc-linux-5.10.4-glibc-x86_64-V2.6.1-20220906.tar.gz
-export RISCV_ROOT_PATH=/home/nihui/osd/Xuantie-900-gcc-linux-5.10.4-glibc-x86_64-V2.6.1
+tar -xf Xuantie-900-gcc-linux-6.6.0-glibc-x86_64-V3.0.1-20241120.tar.gz
+export RISCV_ROOT_PATH=/home/nihui/osd/Xuantie-900-gcc-linux-6.6.0-glibc-x86_64-V3.0.1
 ```
 
 Build ncnn with riscv-v vector and simpleocv enabled:
 ```shell
 mkdir -p build-c906
 cd build-c906
 cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/c906-v226.toolchain.cmake \
-    -DCMAKE_BUILD_TYPE=release -DNCNN_OPENMP=OFF -DNCNN_THREADS=OFF -DNCNN_RUNTIME_CPU=OFF -DNCNN_RVV=ON \
+    -DCMAKE_BUILD_TYPE=release -DNCNN_OPENMP=OFF -DNCNN_THREADS=OFF -DNCNN_RUNTIME_CPU=OFF -DNCNN_RVV=OFF -DNCNN_XTHEADVECTOR=ON -DNCNN_ZFH=ON \
     -DNCNN_SIMPLEOCV=ON -DNCNN_BUILD_EXAMPLES=ON ..
 cmake --build . -j 4
 cmake --build . --target install