tree 7a653e9d188f46258024958c86c3f34d8ae4a05d
parent e08588d4ae3ed7c81de08aaf88f3454b4985f1b3
author Joel E. Denny <jdenny.ornl@gmail.com> 1757620518 -0400
committer GitHub <noreply@github.com> 1757620518 -0400
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[PGO] Add llvm.loop.estimated_trip_count metadata (#152775)

This patch implements the `llvm.loop.estimated_trip_count` metadata
discussed in [[RFC] Fix Loop Transformations to Preserve Block
Frequencies](https://discourse.llvm.org/t/rfc-fix-loop-transformations-to-preserve-block-frequencies/85785).
As the RFC explains, that metadata enables future patches, such as PR
#128785, to fix block frequency issues without losing estimated trip
counts.