tree 92520646d898ef1f5c179246ef64d71752d70b2b
parent 04e78b4ddca78a47bfafdfd99b1f4016906819b1
author David Green <david.green@arm.com> 1761724061 +0000
committer GitHub <noreply@github.com> 1761724061 +0000
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[AArch64][GlobalISel] Add a constant funnel shift post-legalizer combine. (#151912)

We want to be able to produce extr instructions post-legalization. They
are legal for scalars, acting as a funnel shift with a constant shift
amount. Unfortunately I'm not sure if there is a way currently to
represent that in the legalization rules, but it might be useful for
several operations - to be able to treat and test operands with constant
operands as legal or not.

This adds a change to the existing matchOrShiftToFunnelShift so that
AArch64 can generate such instructions post-legalization providing that
the operation is scalar and the shift amount is constant.