[PATCH] D92219: [AMDGPU][GlobalISel] Avoid selecting S_PACK with constants

[Jay Foad via Phabricator via llvm-commits]

foad added a comment.

> Specific case from one of the tests:
>
>   %5:sgpr(s16) = G_FCONSTANT half 0xH4000
>   %7:sgpr(s32) = G_ANYEXT %5:sgpr(s16)
>   %4:sreg_32(<2 x s16>) = G_BUILD_VECTOR_TRUNC %7:sgpr(s32), %7:sgpr(s32)

Perhaps there should be a combine that simplifies this to G_BUILD_VECTOR %5, %5.


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  https://reviews.llvm.org/D92219/new/

https://reviews.llvm.org/D92219