[PATCH] D121084: [NewPM][Inliner] Make inlined calls to functions in same SCC as callee exponentially expensive

[Arthur Eubanks via Phabricator via llvm-commits]

aeubanks created this revision.
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Introduce a new attribute "function-inline-cost-multiplier" which
multiplies the inline cost of a call site (or all calls to a callee) by
the multiplier.

When processing the list of calls created by inlining, check each call
to see if the new call's callee is in the same SCC as the original
callee. If so, set the "function-inline-cost-multiplier" attribute of
the new call site to double the original call site's attribute value.
This does not happen when the original call site is intra-SCC.

This is an alternative to D120584 <https://reviews.llvm.org/D120584>, which marks the call sites as
noinline.

Hopefully fixes PR45253.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121084

Files:
  llvm/include/llvm/Analysis/InlineCost.h
  llvm/lib/Analysis/InlineCost.cpp
  llvm/lib/Transforms/IPO/Inliner.cpp
  llvm/test/Transforms/Inline/inline-cost-attributes.ll
  llvm/test/Transforms/Inline/mut-rec-scc-2.ll
  llvm/test/Transforms/Inline/mut-rec-scc.ll

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