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GlobalISel: Add target pre-isel instructions

Authored by arsenm on Oct 7 2019, 8:41 AM.



Allows targets to introduce regbankselectable
pseudo-instructions. Currently the closet feature to this is an
intrinsic. However this requires creating a public intrinsic
declaration. This litters the public intrinsic namespace with
operations we don't necessarily want to expose to IR producers, and
would rather leave as private to the backend.

Use a new instruction bit. A previous attempt tried to keep using enum
value ranges, but it turned into a mess.

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arsenm created this revision.Oct 7 2019, 8:41 AM

I really like the approach here. Thanks for working on this.

This revision is now accepted and ready to land.Oct 7 2019, 10:19 AM
qcolombet accepted this revision.Oct 7 2019, 10:30 AM
qcolombet added inline comments.

Replying to the TODO: No, I don't think they should because after ISel the expectation is that pre-isel opcodes are not present anymore.

arsenm closed this revision.Oct 7 2019, 11:41 AM
arsenm marked an inline comment as done.