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https://issues.apache.org/jira/browse/LUCY-216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Logan Bell resolved LUCY-216.
-----------------------------
Resolution: Fixed
Fix Version/s: 0.3.1 (incubating)
This should now be resolved, thanks to Nick's commuinique with the LLVM group:
http://llvm.org/bugs/show_bug.cgi?id=12335
> t/152-inversion.t failure
> -------------------------
>
> Key: LUCY-216
> URL: https://issues.apache.org/jira/browse/LUCY-216
> Project: Lucy
> Issue Type: Bug
> Reporter: Logan Bell
> Fix For: 0.3.1 (incubating)
>
> Attachments: Inversion.s-O0, Inversion.s-O0O1.diff, Inversion.s-O1
>
>
> Devs,
> Today Marvin helped me track down what we believe is a compiler optimization
> bug associated with the latest version of xcode and Mac OS 10.7.3 (Lion),
> compiler clan version 3.1. To summarize, I was getting the following unit
> test failure when after compiling Lucy with Perl 5.14.2 (perl brew install):
> not ok 2 - catch overflow in token position calculation
> # Failed test 'catch overflow in token position calculation'
> # at t/152-inversion.t line 70.
> # ''
> # doesn't match '(?^:position)'
> After dropping in various debug statements the unit test would magically
> begin to pass. At this point I turned off optimization and the test would
> always pass. Based on this evidence it would be safe to surmise that the
> optimizer is making a mistake somewhere. After further discussions on IRC
> with Marvin, we speculated that 32 bit integers that are being accumulated
> into 64 bit registers are *not* being truncated back to 32 bit prior to a
> comparison operation. Apparently during these stages we're speculating that
> the optimizer is running afoul.
> One idea that was floated on IRC was to convert the associated integers in
> question to int64_t, since support for 64 bit integers is required anyways
> for Lucy. However, we wanted to throw this issue up to the list and see if
> anyone else can maybe a) replicate this and b) has any other thoughtful
> solutions.
> Cheers,
> Logan
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