[llvm] [Exegesis][RISCV] Add initial RVV support (PR #128767)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> LLVM Buildbot has detected a new failure on builder `clang-with-thin-lto-ubuntu` running on `as-worker-92` while building `llvm` at step 7 "test-stage1-compiler".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/127/builds/2556
> 
> Here is the relevant piece of the build log for the reference
> ```
> Step 7 (test-stage1-compiler) failure: build (failure)
> ...
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/ld64.lld
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/wasm-ld
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/utils/lit/tests/lit.cfg:111: warning: Setting a timeout per test not supported. Requires the Python psutil module but it could not be found. Try installing it via pip or via your operating system's package manager.
>  Some tests will be skipped and the --timeout command line argument will not work.
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld.lld: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/ld.lld
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using lld-link: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/lld-link
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using ld64.lld: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/ld64.lld
> llvm-lit: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:512: note: using wasm-ld: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/wasm-ld
> -- Testing: 83875 tests, 72 workers --
> Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80..
> FAIL: LLVM :: tools/llvm-exegesis/RISCV/rvv/reduction.test (74191 of 83875)
> ******************** TEST 'LLVM :: tools/llvm-exegesis/RISCV/rvv/reduction.test' FAILED ********************
> Exit Code: 1
> 
> Command Output (stderr):
> --
> RUN: at line 1: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/llvm-exegesis -mtriple=riscv64 -mcpu=sifive-p670 -benchmark-phase=assemble-measured-code --mode=latency --opcode-name=PseudoVWREDSUMU_VS_M8_E32 --min-instructions=100 |     /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/reduction.test
> + /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/llvm-exegesis -mtriple=riscv64 -mcpu=sifive-p670 -benchmark-phase=assemble-measured-code --mode=latency --opcode-name=PseudoVWREDSUMU_VS_M8_E32 --min-instructions=100
> + /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/reduction.test
> /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/reduction.test:7:14: error: CHECK-NOT: excluded string found in input
> # CHECK-NOT: V[[REG:[0-9]+]] V[[REG]] V{{[0-9]+}}M8 V[[REG]]
>              ^
> <stdin>:5:31: note: found here
>  - 'PseudoVWREDSUMU_VS_M8_E32 V9 V9 V8M8 V9 i_0xffffffffffffffff i_0x5 i_0x0'
>                               ^~~~~~~~~~~~~
> <stdin>:5:32: note: captured var "REG"
>  - 'PseudoVWREDSUMU_VS_M8_E32 V9 V9 V8M8 V9 i_0xffffffffffffffff i_0x5 i_0x0'
>                                ^
> 
> Input file: <stdin>
> Check file: /home/buildbot/as-worker-92/clang-with-thin-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/reduction.test
> 
> -dump-input=help explains the following input dump.
> 
> Input was:
> <<<<<<
>          1: --- 
>          2: mode: latency 
>          3: key: 
>          4:  instructions: 
>          5:  - 'PseudoVWREDSUMU_VS_M8_E32 V9 V9 V8M8 V9 i_0xffffffffffffffff i_0x5 i_0x0' 
> not:7'0                                   !~~~~~~~~~~~~                                    error: no match expected
> not:7'1                                    !                                               captured var "REG"
>          6:  config: 'vtype = {AVL: VLMAX, SEW: e32, Policy: tu/mu}' 
>          7:  register_initial_values: 
>          8:  - 'V9=0x0' 
>          9:  - 'V8M8=0x0' 
>         10: cpu_name: sifive-p670 
>          .
> ```

Fixed by b2cc28cab113554aa63b9097f23796d59175d28f

https://github.com/llvm/llvm-project/pull/128767