tree 5c5124a127b0458d013486010298099da17c5642
parent 7be3973a27e7ff231135687c8705e84a19987aab
author David Green <david.green@arm.com> 1765222532 +0000
committer GitHub <noreply@github.com> 1765222532 +0000
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[DAG] Generate UMULH/SMULH with wider vector types (#170283)

The existing code for generating umulh/smulh was checking that that the
getTypeToTransformTo was a LegalOrCustom operation. This only takes a
single legalization step though, so if v4i32 was legal, a v8i32 would be
transformed but a v16i32 would not.

This patch introduces a getLegalTypeToTransformTo that performs
getTypeToTransformTo until a legal type is reached. The umulh/smulh code
can then use it to check if the final resultant type will be legal.