tree 17af3f4e8ad79a2b6dc4fae2f6c04499b6d2dcb9
parent c5f1c694ac2bbb07887abd88983bf4bec00830fe
author Teresa Johnson <tejohnson@google.com> 1761229005 -0700
committer GitHub <noreply@github.com> 1761229005 -0700
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[WPD] Reduce ThinLTO link time by avoiding unnecessary summary analysis (#164046)

We are scanning through every single definition of a vtable across all
translation units which is unnecessary in most cases.

If this is a local, we want to make sure there isn't another local with
the same GUID due to it having the same relative path. However, we were
always scanning through every single summary in all cases.

We can now check the new HasLocal flag added in PR164647 ahead of the
loop,
instead of checking on every iteration.

This cut down a large thin link by around 6%, which was over half the
time it spent in WPD.

Note that we previously took the last conforming vtable summary, and now
we use the first. This caused a test difference in one somewhat
contrived test for vtables in comdats.