[PATCH] D58994: [SCEV] Use depth limit for trunc analysis

[Teresa Johnson via Phabricator via llvm-commits]

tejohnson created this revision.
tejohnson added a reviewer: mkazantsev.
Herald added subscribers: jdoerfert, sanjoy.
Herald added a project: LLVM.

This fixes an extremely long compile time caused by recursive analysis
of truncs, which were not previously subject to any depth limits unlike
some of the other ops. I decided to use the same control used for
sext/zext, since the routines analyzing these are sometimes mutually
recursive with the trunc analysis.


Repository:
  rL LLVM

https://reviews.llvm.org/D58994

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  test/Analysis/ScalarEvolution/limit-depth.ll

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