tree 3fdf72ca5b0815765a7ab01f585dd024976c326b
parent fed4727187e73c1b61bc65c63a66de58318379fc
author David Sherwood <david.sherwood@arm.com> 1742990999 +0000
committer GitHub <noreply@github.com> 1742990999 +0000
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[LV] Optimise users of induction variables in early exit blocks (#130766)

This is the second of two PRs that attempts to improve the IR
generated in the exit blocks of vectorised loops with uncountable
early exits. It follows on from PR #128880. In this PR I am
improving the generated code for users of induction variables in
early exit blocks.

This required using a newly add VPInstruction called
FirstActiveLane, which calculates the index of the first active
predicate in the mask operand.

I have added a new function optimizeEarlyExitInductionUser that
is called from optimizeInductionExitUsers when handling users in
early exit blocks.