[llvm] [SLP]Improve minbitwidth analysis for trun'ed gather nodes. (PR #99072)

[Alexey Bataev via llvm-commits]

alexey-bataev wrote:

> > Can you provide a reproducer? I cannot reproduce the issue
> 
> [build no. 1412](https://lab.llvm.org/buildbot/#/builders/95/builds/1412) does not do anything special outside of build the llvm-project and test the c/c++ compilers on lllvm-test-suite, if you were able to run the affected test case on your platform using the bot's cmake configuration and it passed then it is likely a platform specific issue, in this case one of us will have to revert and investigate in the morning (I am EST zone). I can look into providing PowerPC machine access at that point.
> 
> the llvm-project build command was:
> 
> ```shell
> cmake-3.28.2/bin/cmake -DLLVM_ENABLE_ASSERTIONS=ON -DCMAKE_BUILD_TYPE=Release -DLLVM_LIT_ARGS=-v -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache '-DLLVM_ENABLE_PROJECTS=clang-tools-extra;llvm;clang' -DLLVM_ENABLE_RUNTIMES=compiler-rt -GNinja ../llvm-project/llvm && ninja -j 128
> ```
> 
> and the test-suite build command was:
> 
> ```shell
> cmake-3.28.2/bin/cmake -G Ninja -DCMAKE_C_COMPILER=/home/kamaub/Github/llvm/mono2/test-suite-reproducer/bin/clang -DCMAKE_CXX_COMPILER=/home/kamaub/Github/llvm/mono2/test-suite-reproducer/bin/clang++ -DTEST_SUITE_LIT:FILEPATH=/home/kamaub/Github/llvm/mono2/test-suite-reproducer/bin/llvm-lit /home/kamaub/Github/llvm/test-suite && ninja -j 128 && /home/kamaub/Github/llvm/mono2/test-suite-reproducer/bin/llvm-lit -j 128 -v .
> ```
> 
> I do not believe you're required to run the entire suite as `llvm-lit <build-dir>` does in the above command but I forget the exact semantics to run a specific test-suite case at this time. I will update when I uncover that.

It is ppc specific issue, no other targets have reported the issue with the patch. That's why I ask for the PPC reproducer

https://github.com/llvm/llvm-project/pull/99072