tree ad1eefe0f845baa81bd937614bd45ac84b70c1e6
parent f2dfa53ae587b1ab4e48187e39bb55809805a319
author Steven Perron <stevenperron@google.com> 1656510806 -0400
committer GitHub <noreply@github.com> 1656510806 -0400
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Build struct order only for the section needed when unrolling. (#4830)

We currently build the structured order for all nodes reachable from the
loop header when unrolling a loop.  However, unrolling only needs the
nodes in the loop and possibly the merge node.

To avoid needless computation, I have implemented a search that will
stop at the merge node.

Fixes #4827