[llvm] [AMDGPU][GFX1250] Use null register for global_prefetch_b8 instead of s[0:1] (PR #214127)

LLVM Continuous Integration via llvm-commits llvm-commits at lists.llvm.org
Wed Aug 5 07:46:40 PDT 2026 

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-dev-x86-64` running on `ml-opt-dev-x86-64-b1` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/137/builds/43602

<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/llvm.amdgcn.s.buffer.load.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu6.00 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX678,GFX67,GFX6
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu6.00
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX678,GFX67,GFX6
# RUN: at line 3
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu7.01 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX678,GFX789,GFX67,GFX78,GFX7
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu7.01
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX678,GFX789,GFX67,GFX78,GFX7
# RUN: at line 4
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu8.02 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX678,GFX789,GFX8910,GFX78,GFX89,GFX8
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu8.02
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX678,GFX789,GFX8910,GFX78,GFX89,GFX8
# RUN: at line 5
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu9.00 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX789,GFX8910,GFX89,GFX910,GFX9
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu9.00
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX6789,GFX78910,GFX789,GFX8910,GFX89,GFX910,GFX9
# RUN: at line 6
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu10.10 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX78910,GFX8910,GFX910,GFX10
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu10.10
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX678910,GFX78910,GFX8910,GFX910,GFX10
# RUN: at line 7
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu11.00 -amdgpu-enable-vopd=0 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX11
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu11.00 -amdgpu-enable-vopd=0
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX11
# RUN: at line 8
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu12.00 -amdgpu-enable-vopd=0 | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX1200_GFX1250,GFX1200
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu12.00 -amdgpu-enable-vopd=0
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX1200_GFX1250,GFX1200
# RUN: at line 9
/b/ml-opt-dev-x86-64-b1/build/bin/llc < /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -mtriple=amdgpu12.50 -amdgpu-enable-vopd=0 -mattr=-wait-xcnt | /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX1200_GFX1250,GFX1250
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/llc -mtriple=amdgpu12.50 -amdgpu-enable-vopd=0 -mattr=-wait-xcnt
# executed command: /b/ml-opt-dev-x86-64-b1/build/bin/FileCheck /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll -check-prefixes=GFX1200_GFX1250,GFX1250
# .---command stderr------------
# | /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll:2180:17: error: GFX1250-NEXT: expected string not found in input
# | ; GFX1250-NEXT: global_prefetch_b8 v0, s[0:1] scope:SCOPE_SE
# |                 ^
# | <stdin>:2394:9: note: scanning from here
# | ; %bb.0:
# |         ^
# | <stdin>:2395:2: note: possible intended match here
# |  global_prefetch_b8 v0, null scope:SCOPE_SE
# |  ^
# | /b/ml-opt-dev-x86-64-b1/llvm-project/llvm/test/CodeGen/AMDGPU/llvm.amdgcn.s.buffer.load.ll:2237:17: error: GFX1250-NEXT: expected string not found in input
# | ; GFX1250-NEXT: global_prefetch_b8 v0, s[0:1] scope:SCOPE_SE
# |                 ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/214127

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