[llvm-dev] Regarding Usage of opt

[John Criswell via llvm-dev]

On 3/4/16 10:40 AM, Mehdi Amini via llvm-dev wrote:
>
> [snip]
>>
>>
>> -------------------------------------------------------------- Error 
>> End --------------------------------------------------------------
>>
>> Question 2:
>>
>> Some passes depend on other dependencies. Is there any convenient way 
>> to get the dependency for a specific pass?
>>
> Not than I know of (other than reading the source code, which is 
> fortunately very easy: look for getAnalysisUsage())

The -debug-pass=structure option to opt will print out the passes that 
are run and in what order.  From that output, you can generally 
determine which set of analysis passes are used by which set of 
optimizations.  It can help narrow down which source code you need to 
examine.

Regards,

John Criswell

>
>
> -- 
> Mehdi
>
>
>
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-- 
John Criswell
Assistant Professor
Department of Computer Science, University of Rochester
http://www.cs.rochester.edu/u/criswell

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