CODEWITHSUNDEEP
gccclangllvmriscvriscv32
Fabian
Fabian

Reputation: 434

RISC-V Toolchain with Vector support

I am looking for a C/C++ toolchain that supports the RISC-V vector extension v1.0 as defined per official spec.

Spike appears to support vector rvv1.0, but I am having trouble finding a toolchain to use it with.

Neither GCC (I only see a branch for rvv0.9) nor LLVM (I am using LLVM/clang 13.0.0, which only goes up to rvv0.10) appear to support the latest spec.

Can somebody point me to a working toolchain or do I just have to wait some more for the tools to catch up?

Upvotes: 6

Views: 5183

Answers (2)

tonyzhong
tonyzhong

Reputation: 91

GCC support RVV1.0 feature now. You can use this:https://github.com/riscv-collab/riscv-gnu-toolchain. checkout riscv-gcc to riscv-gcc-rvv-next and riscv-binutils-gdb to riscv-binutils-2.38. Then you can have latest RVV1.0 features in GNU toolchain

To support auto-vectorization: use -mrvv compile options.

Upvotes: 6

Alexy Khilaev
Alexy Khilaev

Reputation: 444

now, at 8 dec 2021 you can use llvm + clang 14.0.0 3eda87732fbac6f316e9e83984ef9a90f962c381 with enabled vector support rvv 0.1.

  1. Compile RISCV GCC TOOLCHAIN

  2. Compile LLVM + CLANG + LLD

  3. Add GCC Toolchain to llvm install folder, here described how you can do it Using Clang to compile for RISC-V

  4. And finally vectorize with next keys:

    clang -O2 -c -march=rv64gv0p10 test.ll -o test1.o -menable-experimental-extensions -mllvm --riscv-v-vector-bits-min=256 -mno-relax

Here is an output - objdump file: enter image description here Objdump won't recognize instructions but you can see it if you emit assembler code with -S key: enter image description here

Upvotes: 3

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