https://llvm.org/bugs/show_bug.cgi?id=30292
Bug ID: 30292
Summary: infinite loop (?) in -simplifycfg
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: will...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17215
--> https://llvm.org/bugs/attachment.cgi?id=17215&action=edit
bitcode demonstrating bug, from libevent
Encountered this starting about a week ago on trunk, occurred when building
libevent.
With the attached bc file:
$ opt event.bc -simplifycfg -disable-output -debug-pass=Executions
...
[2016-09-06 09:38:06.956737000] 0x3838f10 Executing Pass 'Simplify the CFG'
on Function 'event_base_loop'...
And it proceeds to never complete this pass (hours+).
I'm not sure what the best way to reduce a timing-related bug is, apologies for
the non-reduced test-case. Even getting this bitcode was more trouble than I
expected (tips welcome, is there a better way?): I ended up using
-print-before=simplifycfg and kludging the function printing pass to dump the
entire module instead.
LMK if you have any questions or problems reproducing on trunk, thanks!
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