[llvm] [GlobalISel] prevent G_UNMERGE_VALUES for vectors with different elements (PR #133335)

Wed Jun 18 00:23:03 PDT 2025

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/19588

<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/GlobalISel/insertelement.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llc -global-isel -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx900 -verify-machineinstrs < /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck -check-prefix=GPRIDX /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll # RUN: at line 2
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llc -global-isel -mtriple=amdgcn-mesa-mesa3d -mcpu=gfx900 -verify-machineinstrs
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck -check-prefix=GPRIDX /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll
[1m/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll:6514:16: [0m[0;1;31merror: [0m[1mGPRIDX-NEXT: is not on the line after the previous match
[0m; GPRIDX-NEXT: s_load_dwordx16 s[12:27], s[8:9], 0x0
[0;1;32m               ^
[0m[1m<stdin>:6451:2: [0m[0;1;30mnote: [0m[1m'next' match was here
[0m s_load_dwordx16 s[12:27], s[8:9], 0x0
[0;1;32m ^
[0m[1m<stdin>:6448:15: [0m[0;1;30mnote: [0m[1mprevious match ended here
[0m; %bb.0: ; %bb
[0;1;32m              ^
[0m[1m<stdin>:6449:1: [0m[0;1;30mnote: [0m[1mnon-matching line after previous match is here
[0m s_add_u32 flat_scratch_lo, s12, s17
[0;1;32m^
[0m
Input file: <stdin>
Check file: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/llvm/test/CodeGen/AMDGPU/GlobalISel/insertelement.ll

-dump-input=help explains the following input dump.

Input was:
<<<<<<
[1m[0m[0;1;30m              1: [0m[1m[0;1;46m .section .AMDGPU.config,"", at progbits [0m
[0;1;30m              2: [0m[1m[0;1;46m .long 45096 [0m
[0;1;30m              3: [0m[1m[0;1;46m .long 64 [0m
[0;1;30m              4: [0m[1m[0;1;46m .long 165608 [0m
[0;1;30m              5: [0m[1m[0;1;46m .long 0 [0m
[0;1;30m              6: [0m[1m[0;1;46m .long 45100 [0m
[0;1;30m              7: [0m[1m[0;1;46m .long 0 [0m
[0;1;30m              8: [0m[1m[0;1;46m .long 165580 [0m
[0;1;30m              9: [0m[1m[0;1;46m .long 1 [0m
[0;1;30m             10: [0m[1m[0;1;46m .long 165584 [0m
[0;1;30m             11: [0m[1m[0;1;46m .long 1 [0m
[0;1;30m             12: [0m[1m[0;1;46m .long 4 [0m
[0;1;30m             13: [0m[1m[0;1;46m .long 0 [0m
[0;1;30m             14: [0m[1m[0;1;46m .long 8 [0m
[0;1;30m             15: [0m[1m[0;1;46m .long 0 [0m
[0;1;30m             16: [0m[1m[0;1;46m .text [0m
[0;1;30m             17: [0m[1m[0;1;46m .globl dyn_insertelement_v8i32_s_s_s ; -- Begin function dyn_insertelement_v8i32_s_s_s [0m
[0;1;30m             18: [0m[1m[0;1;46m .p2align 8 [0m
[0;1;30m             19: [0m[1m[0;1;46m .type dyn_insertelement_v8i32_s_s_s, at function [0m
[0;1;30m             20: [0m[1m[0;1;46m[0mdyn_insertelement_v8i32_s_s_s:[0;1;46m ; @dyn_insertelement_v8i32_s_s_s [0m
[0;1;32mlabel:11'0       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[0m[0;1;32mlabel:11'1       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...

```

</details>

https://github.com/llvm/llvm-project/pull/133335