[Mlir-commits] [mlir] [mlir][vector] Replace unused shuffle operands / results with poison (PR #190763)

[LLVM On Power]

llvmonpower wrote:

> This causes LIT failures in https://lab.llvm.org/buildbot/#/builders/157/builds/45765.
> 
> Reproducer:
> 
> ```fortran
> subroutine vec_cvf_test_r4r8(arg1)
>   vector(real(8)), intent(in) :: arg1
>   vector(real(4)) :: r
>   r = vec_cvf(arg1)
> end
> ```
> 
> Compile: `flang -target powerpc64le-unknown-linux-gnu d.f90`
> 
> Output:
> 
> ```
> loc(".../d.f90":4:3): error: failed to legalize operation 'ub.poison': %0 = "ub.poison"() <{value = #ub.poison}> : () -> vector<16xi8>
> error: Lowering to LLVM IR failed
> loc(".../d.f90":1:1): error: cannot be converted to LLVM IR: missing `LLVMTranslationDialectInterface` registration for dialect for op: func.func
> error: failed to create the LLVM module
> ```

Hi @matthias-springer! As @kkwli mentioned in the comment above, this looks like it is still causing issues on [ppc64le-flang-rhel-clang](https://lab.llvm.org/buildbot/#/builders/157). is it possible to follow up with a fix to this?

https://github.com/llvm/llvm-project/pull/190763