tree 5a6fa36921e698fb2891c049ba74ce715429b957
parent ba5591e39d50973bf60fe2716d085465b62768e8
author Csanád Hajdú <csanad.hajdu@arm.com> 1747297869 +0200
committer GitHub <noreply@github.com> 1747297869 +0200
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[AArch64] Prefer using DUP instead of INS where possible (#138549)

Replace all instances of `INS(IMPLICIT_DEF, 0, v, idx)` with
`DUP(v, idx)` in instruction selection.

`INS` (e.g. `mov v0.s[0], v1.s[1]`) has a value dependency on its output
register, which becomes a false dependency when we're inserting into an
`IMPLICIT_DEF` register. We can break this false dependency by using
`DUP` (e.g. `mov s0, v1.s[1]`) instead.