[llvm-dev] Hash of a module

[Jonathan Roelofs via llvm-dev]

On 12/22/15 11:45 AM, Philip Reames via llvm-dev wrote:
>
>
> On 12/21/2015 09:29 AM, Robinson, Paul via llvm-dev wrote:
>>
>> | (canonicalizeOperands swaps arguments of an and and then
>> ReassociateExpression swaps them back).
>>
>> That feels like its own bug, canonicalize and reassociate having
>> different opinions of canonical order.  Just saying.
>>
> It definitely is.  However, we seem to have a good number of these types
> of bugs.  Nothing in our current test infrastructure reveals them, so
> they seem to be relatively widespread.
>
> Might be worthing adding an assertion to the pass manager that the hash
> of a changed module differs from the hash of the original?

The opposite seems like it might be useful too: assert that the hash of 
an unchanged module remains unchanged.

Jon


-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded