https://llvm.org/bugs/show_bug.cgi?id=28825
Bug ID: 28825
Summary: Assertion `NewOuter->isRecursivelyLCSSAForm(*DT) &&
"LCSSA is broken after separating nested loops!"'
failed.
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Core LLVM classes
Assignee: unassignedb...@nondot.org
Reporter: chisophu...@gmail.com
CC: chandl...@gmail.com, dber...@dberlin.org,
llvm-bugs@lists.llvm.org,
michael.v.zolotuk...@gmail.com
Blocks: 28315
Classification: Unclassified
Created attachment 16867
--> https://llvm.org/bugs/attachment.cgi?id=16867&action=edit
Failing test case.
opt: /home/sean/pg/llvm/lib/Transforms/Utils/LoopSimplify.cpp:383: llvm::Loop*
separateNestedLoop(llvm::Loop*, llvm::BasicBlock*, llvm::DominatorTree*,
llvm::LoopInfo*, llvm::ScalarEvolution*, bool, llvm::AssumptionCache*):
Assertion `NewOuter->isRecursivelyLCSSAForm(*DT) && "LCSSA is broken after
separating nested loops!"' failed.
For some reason this only manifests with the new PM.
opt -passes='function(lcssa,loop-simplify)' -disable-output $1
(
but this succeeds:
opt -lcssa -loop-simplify -disable-output $1
)
Sorry for the enormous testcase (attached). Even with the new hotness for CFG
reduction that DannyB added recently this is the best that bugpoint can do.
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