[PATCH] D26524: [AArch64] Sink sext when foldable in user GEPs

[Jun Bum Lim via Phabricator via llvm-commits]

junbuml added a comment.

Before we perform this transformation in CGP, I think we need to move this pass into CGP first.  So, my plan is to extend moveExtToFormExtLoad() to cover the transformation done in this pass. Instead of just looking for a mergeable load in extLdPromotion() , I will look up heads of chains like analyzeSExtension() in aarch64-type-promotion using existing code (TypePromotionTransaction and TypePromotionHelper)  and then promote SExts which derived from the same header. The new extension in CGP will be enabled in AArch64 at first.   Please let me know if there is any suggestion or concern regarding the migration of this pass into CGP.


https://reviews.llvm.org/D26524