[llvm] [AMDGPU][SIInsertWaitcnts] Fix iota_range assertion when OtherMarks is empty in mergeAsyncMarks() (PR #193499)

[via llvm-commits]

xiaohuguo2023 wrote:

> # 🐧 Linux x64 Test Results
> * 173532 tests passed
> * 3278 tests skipped
> * 1 test failed
> 
> ## Failed Tests
> (click on a test name to see its output)
> 
> ### LLVM
> LLVM.CodeGen/AMDGPU/asyncmark-max-pregfx12.ll
> ```
> Exit Code: 1
> 
> Command Output (stdout):
> --
> # RUN: at line 1
> /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -global-isel=0 -mtriple=amdgcn -mcpu=gfx900  < /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/asyncmark-max-pregfx12.ll | /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/asyncmark-max-pregfx12.ll
> # executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/llc -global-isel=0 -mtriple=amdgcn -mcpu=gfx900
> # note: command had no output on stdout or stderr
> # executed command: /home/gha/actions-runner/_work/llvm-project/llvm-project/build/bin/FileCheck /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/asyncmark-max-pregfx12.ll
> # .---command stderr------------
> # | /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/asyncmark-max-pregfx12.ll:153:15: error: CHECK-NEXT: expected string not found in input
> # | ; CHECK-NEXT: s_waitcnt vmcnt(15)
> # |               ^
> # | <stdin>:299:22: note: scanning from here
> # |  ; wait_asyncmark(17)
> # |                      ^
> # | <stdin>:303:2: note: possible intended match here
> # |  s_waitcnt vmcnt(0)
> # |  ^
> # | 
> # | Input file: <stdin>
> # | Check file: /home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/test/CodeGen/AMDGPU/asyncmark-max-pregfx12.ll
> # | 
> # | -dump-input=help explains the following input dump.
> # | 
> # | Input was:
> # | <<<<<<
> # |             .
> # |             .
> # |             .
> # |           294:  ; asyncmark 
> # |           295:  global_load_dword v[0:1], off lds 
> # |           296:  ; asyncmark 
> # |           297: .LBB2_4: ; %endif 
> # |           298:  s_or_b64 exec, exec, s[4:5] 
> # |           299:  ; wait_asyncmark(17) 
> # | next:153'0                          X error: no match found
> # |           300:  ds_read_b32 v0, v2 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~
> # |           301:  s_waitcnt lgkmcnt(0) 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~~~
> # |           302:  global_store_dword v[4:5], v0, off 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> # |           303:  s_waitcnt vmcnt(0) 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~
> # | next:153'1      ?                   possible intended match
> # |           304:  s_setpc_b64 s[30:31] 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~~~
> # |           305: .Lfunc_end2: 
> # | next:153'0     ~~~~~~~~~~~~~
> # |           306:  .size max_when_merged, .Lfunc_end2-max_when_merged 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> # |           307:  ; -- End function 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~
> # |           308:  .set .Lmax_when_merged.num_vgpr, 6 
> # | next:153'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> # |             .
> # |             .
> # |             .
> # | >>>>>>
> # `-----------------------------
> # error: command failed with exit status: 1
> 
> --
> ```
> 
> 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.

this should be fixed now

https://github.com/llvm/llvm-project/pull/193499