[PATCH] D138051: AMDGPU/GlobalISel: Fix broken expansion of 64-bit vector sext_inreg

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D138051#3928610 <https://reviews.llvm.org/D138051#3928610>, @foad wrote:

> I try not to think about shifts at all. The second input operand is just the bit width to extend from.

It's hard to not when trying to lift into IR for alive


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https://reviews.llvm.org/D138051