[LLVMdev] [Polly] Analysis of the expensive compile-time overhead of Polly Dependence pass

[Star Tan]

Hi Sebastian,


Recently, I found the "Polly - Calculate dependences" pass would lead to significant compile-time overhead when compiling some loop-intensive source code. Tobias told me you found similar problem as follows:
http://llvm.org/bugs/show_bug.cgi?id=14240


My evaluation shows that "Polly - Calculate dependences" pass consumes 96.4% of total compile-time overhead when compiling the program you proposed. It seems that the expensive compile-time overhead comes from those loop operations in ISL library. Some preliminary results can be seen on http://llvm.org/bugs/show_bug.cgi?id=14240.


Sebastian, I wonder whether you have further results or suggestions besides those words posted on the Bugzilla page? Any information or suggestion would be appreciated.


Thanks,
Star Tan
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