[llvm] [RISCV] Introduce a new syntax for processor-specific tuning feature strings (Take 2) (PR #175063)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 129261 tests passed
* 2852 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM
<details>
<summary>LLVM.CodeGen/RISCV/features-info.ll</summary>

```
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 1
c:\_work\llvm-project\llvm-project\build\bin\llc.exe -mtriple=riscv32 -mattr=help 2>&1 | c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\RISCV\features-info.ll
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\llc.exe' -mtriple=riscv32 -mattr=help
# note: command had no output on stdout or stderr
# executed command: 'c:\_work\llvm-project\llvm-project\build\bin\filecheck.exe' 'C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\RISCV\features-info.ll'
# .---command stderr------------
# | C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\RISCV\features-info.ll:57:15: error: CHECK-NEXT: expected string not found in input
# | ; CHECK-NEXT: no-sink-splat-operands - Disable sink splat operands to enable .vx, .vf,.wx, and .wf instructions.
# |               ^
# | <stdin>:107:57: note: scanning from here
# |  no-default-unroll - Disable default unroll preference..
# |                                                         ^
# | <stdin>:108:2: note: possible intended match here
# |  no-sink-splat-operands - Disable sink splat operands to enable .vx, .vf, .wx, and .wf instructions.
# |  ^
# | 
# | Input file: <stdin>
# | Check file: C:\_work\llvm-project\llvm-project\llvm\test\CodeGen\RISCV\features-info.ll
# | 
# | -dump-input=help explains the following input dump.
# | 
# | Input was:
# | <<<<<<
# |            .
# |            .
# |            .
# |          102:  log-vrgather - Has vrgather.vv with LMUL*log2(LMUL) latency. 
# |          103:  lui-addi-fusion - Enable LUI+ADDI macro fusion. 
# |          104:  lui-load-fusion - Enable LUI + load macrofusion. 
# |          105:  m - 'M' (Integer Multiplication and Division). 
# |          106:  mips-p8700 - MIPS p8700 processor. 
# |          107:  no-default-unroll - Disable default unroll preference.. 
# | next:57'0                                                             X error: no match found
# |          108:  no-sink-splat-operands - Disable sink splat operands to enable .vx, .vf, .wx, and .wf instructions. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# | next:57'1      ?                                                                                                    possible intended match
# |          109:  no-trailing-seq-cst-fence - Disable trailing fence for seq-cst store.. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |          110:  optimized-nf2-segment-load-store - vlseg2eN.v and vsseg2eN.v are implemented as a wide memory op and shuffle. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |          111:  optimized-nf3-segment-load-store - vlseg3eN.v and vsseg3eN.v are implemented as a wide memory op and shuffle. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |          112:  optimized-nf4-segment-load-store - vlseg4eN.v and vsseg4eN.v are implemented as a wide memory op and shuffle. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |          113:  optimized-nf5-segment-load-store - vlseg5eN.v and vsseg5eN.v are implemented as a wide memory op and shuffle. 
# | next:57'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |            .
# |            .
# |            .
# | >>>>>>
# `-----------------------------
# error: command failed with exit status: 1

--

```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/175063