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[X86] Teach combineToExtendBoolVectorInReg to create opportunities for using broadcast load instructions.

Authored by craig.topper on Sun, Mar 8, 9:30 PM.



If we're inserting a scalar that is smaller than the element
size of the final VT, the value of the extra bits doesn't matter.

Previously we any_extended in the scalar domain before inserting.

This patch changes this to use a broadcast of the original
scalar type and then a bitcast to the final type. This might
enable the use of a broadcast load.

This recovers regressions from 07d68c24aa19483e44db4336b0935b00a5d69949
and 9fcd212e2f678fdbdf304399a1e58ca490dc54d1 without relying on
alignment of the load.

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craig.topper created this revision.Sun, Mar 8, 9:30 PM
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RKSimon accepted this revision.Mon, Mar 9, 7:59 AM



remove the comment?

This revision is now accepted and ready to land.Mon, Mar 9, 7:59 AM
This revision was automatically updated to reflect the committed changes.