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There is a caveat here. I was experimenting with something similar and found that this status is not always trustworthy. I fixed one bug in prune-eh. These is also a bug in reassociate pass. It returns true with no change made on the following instruction:
<div class=""> %0 = and i64 %b, %a</div>
<div class="">It happens because it performs two distinct transformations which nullify each other (canonicalizeOperands swaps arguments of an and and then ReassociateExpression swaps them back).</div>
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<div class="">This approach might work for your set of passes, but beware of the problem.</div>
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<div class="">Artur</div>
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<div class="">On 21 Dec 2015, at 19:59, Russell Wallace <<a href="mailto:russell.wallace@gmail.com" class="">russell.wallace@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Yes, I'm running all the existing passes that I know how to run. I didn't know they returned change-made. Thanks!<br class="">
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<div class="gmail_quote">On Mon, Dec 21, 2015 at 12:36 PM, Artur Pilipenko <span dir="ltr" class="">
<<a href="mailto:apilipenko@azulsystems.com" target="_blank" class="">apilipenko@azulsystems.com</a>></span> wrote:<br class="">
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Are you going to run some of the existing passes? Why can’t you just use the returned change-made value from the passes?<br class="">
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Artur<br class="">
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> On 20 Dec 2015, at 15:43, Russell Wallace via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:<br class="">
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> I want to run a bunch of optimizations, iteratively, that is keep running until things stop changing (to make sure all optimization opportunities are taken). As far as I know, there is no way to copy a module or compare modules by value, so it occurs to me
that a practical solution might be to take the hash code of the module and see if that changes.<br class="">
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> A problem is that hash algorithms are designed to work on streams of bytes, not compound objects.<br class="">
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> First attempt at a solution: iterate through all instructions in all functions and hash the instruction kinds. I can think of some possible changes that would fail to be captured by that.<br class="">
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> Is there any already known solution?<br class="">
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