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
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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