C-Reduce @creduce
I am C-Reduce, the shrinker of C/C++ programs. embed.cs.utah.edu/creduce/ Salt Lake City, UT, USA Joined June 2012-
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@cfbolz @mraleph Didn't know you can use creduce on other langs.. I'll definitely give this a try next time I need it (probably in a few days..)
I'll try anything!
I tried creduce to reduce a segfaulting test case and it reduced it to this 👍 #creduce #screenshotsaturday
We've all been there.
I love working the night shift. 🌜 Thanks for the shout out!
I love working the night shift. 🌜 Thanks for the shout out!
@lemire You should use creduce to minimize that.
Thanks for the shout out!
@BruceDawson0xB @visualc You can make minimal repros using creduce fairly easily. Even with msvc, just do it under WSL and take advantage of the fact you can call native win32 programs. No advanced C++ skills necessary
creduce help text: --shaddap Suppress output about non-fatal internal errors [..] --sllooww Try harder to reduce, but perhaps take a long time to do so
Expectation: I have a bug, let me try to use C-Reduce to reduce it Reality: Run into a bug with C-Reduce itself Happy weekend I guess... Oh wait, it's just Thursday.
TFW the code creduce produces would probably not lead to a productive compiler bug report because it does weird things (like a null deref) that the original code doesn't do, but re-adding parts of the original code makes the bug you're trying to report not reproduce anymore...
@stephenrkell @SreepathiPai @creduce Thanks - for now I wrote a script that inlines specific #included files but does not actually preprocess, then I used @creduce to do a reduction on that code, and things are working nicely.
I'm having a @creduce problem: my source file has been preprocessed using clang-14, and now gcc-11 is complaining about it with errors like: error: two or more data types in declaration specifiers 214 | typedef float _Float32; Anyone know how to solve this?
Chomp chomp chomp!
Let's go!
Thanks for the shout-out!
Congrats to @johnregehr and his collaborators on winning another @PLDI MIP award on his great compiler testing work. Well done!
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@moyix I'm sortof angling (with John's blessing) for Shrink Ray to be the successor to CReduce. It's a bit rough around the edges still, but in most regards is probably already nicer to use. It can do everything CReduce can (by calling clang-delta), though not necessarily as well.
@mraleph @_osa1 I'm just using creduce, works quite well even for not C (eg python is fine). Been meaning to try shrinkray too: github.com/DRMacIver/shri…
(in actual fact there probably are cases where it's better to use shrink ray over creduce for C and C++ test cases, but those cases are like... your test cases are huge, your interestingness test is slow, and you've got a lot of cores to throw at the problem)
@bertmuthalaly The same is actually true of creduce too, but creduce will work better the more like C or C++ your test case looks. Shrink Ray has a bit of a broader remit, although hasn't really been tested on anything that isn't Python or C-ish syntax.
Does such a thing as CReduce for a Python script exist? (Or can CReduce be abused into working on Python code?)
@DRMacIver i didn't realize that about c-reduce! shrink ray seems very cool, will file away for the future :)
Still rough around the edges, so if you use it you may well run into bugs (please report them if so!), but if you've got large messy bugs that you want to turn into small easy to read bugs, and your test cases aren't C or C++ (if they are, use c-reduce still), give it a go.
I tried creduce to reduce a segfaulting test case and it reduced it to this 👍 #creduce #screenshotsaturday
@moyix There’s c-reduce and etc which do this in order to transform a crashing example into an equivalent crashing example
@steubens7 A fuzzer wouldn't help because the failure is happening at the compilation stage. The shader never even gets run, afaiu, so bad inputs aren't causing the failure. c-reduce sounds more like something that could be useful if there's one that easily works with glsl 😅
@garrettkjohnson can you use something like c-reduce or a fuzzer to take some of the load off?
Can we have mlreduce to test and debug ml models similar to c-reduce?
llvm-reduce crashed while reducing an input that triggered my compiler crash.
@atomgalaxy I reduce a lot of compiler bugs, so I have a system that involves a directory full of stub stdlib/system headers, creduce, and some ready-made scripts. I also have a 64-core machine. creduce takes it down to ~10k overnight, and I take it from there.
@lemire You should use creduce to minimize that.
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