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Give backends an opportunity to finish layout post-relaxation
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Authored by colinl on Apr 22 2016, 12:16 PM.

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Summary

Overriding this function gives targets access to the layout post-relaxation and before writing fragments to output.

Hexagon is using this to more intelligently pad nops by using a larger encoding for the previous instruction if possible.

We aren't able to do this with the existing writeNopData since the previous instructions have already been encoded to the output stream.

I imagine other targets would be able to do similar optimizations and possibly more.

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rL LLVM

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colinl updated this revision to Diff 54699.Apr 22 2016, 12:16 PM
colinl retitled this revision from to Give backends an opportunity to finish layout post-relaxation.
colinl updated this object.
colinl set the repository for this revision to rL LLVM.
colinl added a subscriber: llvm-commits.
khemant accepted this revision.Apr 26 2016, 9:34 AM
khemant edited edge metadata.
This revision is now accepted and ready to land.Apr 26 2016, 9:34 AM
This revision was automatically updated to reflect the committed changes.