[PATCH] D86841: [clang] Adds noprogress attribute deduction for infinite loops

[Atmn Patel via Phabricator via cfe-commits]

atmnpatel created this revision.
atmnpatel added reviewers: jdoerfert, aqjune, RalfJung.
Herald added subscribers: cfe-commits, danielkiss.
Herald added a project: clang.
atmnpatel requested review of this revision.

The `noprogress` LLVM IR attribute currently under discussion is deduced for functions that contain loops that have a constant non-zero conditional as per the C Spec. In addition, these particular loops have an additional bit of metadata `llvm.loop.noprogress` so llvm can differentiate between the loops that can be optimized out and ones that can't be optimized out. The changes to the LoopDeletion pass is incoming.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D86841

Files:
  clang/lib/CodeGen/CGLoopInfo.cpp
  clang/lib/CodeGen/CGLoopInfo.h
  clang/lib/CodeGen/CGStmt.cpp
  clang/test/CodeGen/attr-noprogress.c

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