Matt Arsenault 077e0c134a AMDGPU: Generalize truncate of shift of cast build_vector combine (#125617) ...

Previously we only handled cases that looked like the high element
extract of a 64-bit shift. Generalize this to handle any multiple
indexing. I was hoping this would help avoid some regressions,
but it did not. It does however reduce the number of steps the DAG
takes to process these cases.

NFC-ish, I have yet to find an example where this changes the
final output.

2025-02-04 11:46:30 +07:00

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