tree a9d2befd5f798347fff058286b0aa15ff4a262d1
parent 227c4383d634450ab4a2722273daf6340cf314c4
author Sander de Smalen <sander.desmalen@arm.com> 1637525271 +0000
committer Copybara-Service <copybara-worker@google.com> 1638093471 -0800

[LV] Fix incorrectly marking a pointer indvar as 'scalar'.

collectLoopScalars should only add non-uniform nodes to the list if they
are used by a load/store instruction that is marked as CM_Scalarize.

Before this patch, the LV incorrectly marked pointer induction variables
as 'scalar' when they required to be widened by something else,
such as a compare instruction, and weren't used by a node marked as
'CM_Scalarize'. This case is covered by sve-widen-phi.ll.

This change also allows removing some code where the LV tried to
widen the PHI nodes with a stepvector, even though it was marked as
'scalarAfterVectorization'. Now that this code is more careful about
marking instructions that need widening as 'scalar', this code has
become redundant.

Differential Revision: https://reviews.llvm.org/D114373

GitOrigin-RevId: 28a4deab921d2d9a1e27d520fc3f745eb8d9aa02