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[X86] Add prefer-128-bit subtarget feature.

Authored by craig.topper on Fri, Sep 6, 9:35 PM.



Similar to the previous prefer-256-bit flag. We might want to
enable this by default some CPUs. This just starts the initial
work to implement and prove that it effects TTI's vector width.

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craig.topper created this revision.Fri, Sep 6, 9:35 PM
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lebedev.ri added inline comments.
383 ↗(On Diff #219221)

Did you mean SSE?

craig.topper marked an inline comment as done.Sat, Sep 7, 12:30 AM
craig.topper added inline comments.
383 ↗(On Diff #219221)

We'll end up using 128-bit VEX encoded instructions which are part of AVX/AVX2

RKSimon accepted this revision.Sat, Sep 7, 4:45 AM

LGTM - this could be useful!

This revision is now accepted and ready to land.Sat, Sep 7, 4:45 AM
Closed by commit rL371319: [X86] Add prefer-128-bit subtarget feature. (authored by ctopper, committed by ). · Explain WhySat, Sep 7, 12:53 PM
This revision was automatically updated to reflect the committed changes.