https://bugs.llvm.org/show_bug.cgi?id=42280
Bug ID: 42280
Summary: opt -early-cse sometimes crashing with Assertion
`!Result || (LHS.isSentinel() && LHS.Inst == RHS.Inst)
|| getHashValueImpl(LHS) == getHashValueImpl(RHS)'
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: mikael.hol...@ericsson.com
CC: llvm-bugs@lists.llvm.org
Created attachment 22100
--> https://bugs.llvm.org/attachment.cgi?id=22100&action=edit
reproducer
Running
opt -early-cse -o /dev/null './reduced3.ll'
sometimes crashes with
opt: ../lib/Transforms/Scalar/EarlyCSE.cpp:353: static bool
llvm::DenseMapInfo<(anonymous namespace)::SimpleValue>::isEqual((anonymous
namespace)::SimpleValue, (anonymous namespace)::SimpleValue): Assertion
`!Result || (LHS.isSentinel() && LHS.Inst == RHS.Inst) || getHashValueImpl(LHS)
== getHashValueImpl(RHS)' failed.
Usually it crashes within 30 attempts but sometimes it takes a lot more.
(On earlier versions of the compiler it crashed like once in 3000 attempts so
we seem to be "lucky" with current trunk version r363355)
The input can for sure be reduced more but it's a bit messy since it's not
crashing all the time.
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