clang-12: error: unknown argument: '-mepi'

[Kuntin555]

when I use llvm from PLTC （https://github.com/plctlab/llvm-project） compile the RVV benchmark（https://github.com/RALC88/riscv-vectorized-benchmark-suite/tree/rvv-1.0）
it can't find argument '-mepi'.
My steps are as follows：

1. compile and install the llvm
   export RISCV=~/opt/riscv-vector
   git clone https://github.com/plctlab/llvm-project.git
   cd llvm-project-rvv-iscas
   mkdir build
   cd build
   cmake -G "Unix Makefiles"
   -DLLVM_TARGETS_TO_BUILD="RISCV"
   -DCMAKE_INSTALL_PREFIX=$RISCV
   -DCMAKE_BUILD_TYPE=Release
   -DLLVM_USE_LINKER=gold
   -DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi;lld" ../llvm
   make -j12
   make install
2. compile the rvv benchmark
   git clone https://github.com/RALC88/riscv-vectorized-benchmark-suite.git
   cd riscv-vectorized-benchmark-suite
   export LLVM=/opt/riscv-vector
   export PATH=$PATH:/opt/riscv-vector/bin
   make all
   clang-12: error: unknown argument: '-mepi'

[ChunyuLiao]

Is rvv benchmark this branch？ https://github.com/RALC88/riscv-vectorized-benchmark-suite/tree/rvv-1.0

[ChunyuLiao]

@Kuntin555

[Kuntin555]

yes

[ChunyuLiao]

Bin/blacksholes_vector.exe come from the https://github.com/RALC88/riscv-vectorized-benchmark-suite/tree/rvv-0.7. You should recompile the binaries , eg: rvv-test

1. compile riscv-gnu-toolchain: newlib

2. example _axpy:
   2.1 clang -Wall --target=riscv64-unknown-elf -march=rv64gcv1p0 -menable-experimental-extensions -O2 --sysroot=/newlib/riscv64-unknown-elf --gcc-toolchain=/home/liaochunyu/install/upstream-newlib/ -c -o src/axpy.o src/axpy.c
   2.2 clang -Wall --target=riscv64-unknown-elf -march=rv64gcv1p0 -menable-experimental-extensions -O2 --sysroot=/newlib/riscv64-unknown-elf --gcc-toolchain=/newlib/ -c -o src/main.o src/main.c
   clang -Wall --target=riscv64-unknown-elf -march=rv64gcv1p0 -menable-experimental-extensions -O2 --sysroot=/newlib/riscv64-unknown-elf --gcc-toolchain=/newlib/ -c -o src/utils.o src/utils.c
   2.3 clang -Wall --target=riscv64-unknown-elf -march=rv64gcv1p0 -menable-experimental-extensions -O2 --sysroot=/newlib/riscv64-unknown-elf --gcc-toolchain=~/newlib/ -O2 -o bin/rvv-test src/*.o -lm

3. objdump:
   llvm-objdump --mattr=+m,+f,+d,+a,+c,+experimental-v -ds bin/rvv-test