[llvm] [RegAlloc] Fix the terminal rule check for interfere with DstReg (PR #168661)

Sat Nov 22 19:44:21 PST 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu-no-asserts` running on `doug-worker-6` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/202/builds/4304

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/AMDGPU/local-atomicrmw-fadd.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=+real-true16
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX12,GFX12-TRUE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 3
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1200 -mattr=-real-true16
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX12,GFX12-FAKE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 4
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX942 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx942
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX942 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 5
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1100 -mattr=+real-true16 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX11,GFX11-TRUE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1100 -mattr=+real-true16
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX11,GFX11-TRUE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 6
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1100 -mattr=-real-true16 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX11,GFX11-FAKE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1100 -mattr=-real-true16
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefixes=GFX11,GFX11-FAKE16 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 7
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1010 < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX10 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx1010
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX10 /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# note: command had no output on stdout or stderr
# RUN: at line 8
/home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx90a < /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll | /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX90A /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/llc -mtriple=amdgcn-amd-amdpal -mcpu=gfx90a
# note: command had no output on stdout or stderr
# executed command: /home/buildbot/buildbot-root/gcc-no-asserts/build/bin/FileCheck -check-prefix=GFX90A /home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll
# .---command stderr------------
# | [1m/home/buildbot/buildbot-root/gcc-no-asserts/llvm-project/llvm/test/CodeGen/AMDGPU/local-atomicrmw-fadd.ll:6965:16: [0m[0;1;31merror: [0m[1mGFX90A-NEXT: expected string not found in input
[0m# | [1m[0m; GFX90A-NEXT: ds_read_b32 v3, v0
# | [0;1;32m               ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/168661