https://bugs.llvm.org/show_bug.cgi?id=39783
Bug ID: 39783
Summary: [LoopSimplifyCFG]
-enable-loop-simplifycfg-term-folding causes many
assertion failures
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: pauls...@linux.vnet.ibm.com
CC: llvm-bugs@lists.llvm.org
I got a lot of assertions from the previous weeks test runs (csmith), to find
that they were all "hidden" with a later revision. Since I did not find these
asserts here on Bugzilla, I continued with a git bisect and found out that
there has been a new option '-enable-loop-simplifycfg-term-folding' addedwhich
defaults to false, which disables the(se) bug(s).
I continued to make three reduced test cases for the different asserts I saw,
which I will post here in a minute.
And then, after all this, I found that this is actually a known issue with
XFAILing test case using the option:
test/Transforms/LoopSimplifyCFG/phi_with_duplicating_inputs.ll :-/
I wish that this would have been posted here on Bugzilla, or at least explained
as a comment around that option, or in the commit messages. There appears to
not even have been any review made, so I am a bit confused. Perhaps I just
missed this information somewhere?
I wonder now if my test cases are redundant with the XFAILing ones? Could the
committer perhaps make further comments on this, please?
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