[PATCH] D64726: AMDGPU/GlobalISel: Fix not constraining result reg of copies to VCC

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

In D64726#1587233 <https://reviews.llvm.org/D64726#1587233>, @nhaehnle wrote:

> This seems incorrect, doesn't it? The truncation disappeared.... (e.g., what if $sgpr0 is 0x10)


My current understanding of G_TRUNC is it's a no-op, and supposed to always be legal. This is supposed to be the legalized MIR, so theoretically this was generated by something that knew the original argument was zeroext from i1


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https://reviews.llvm.org/D64726