<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Hans, it’s challenging to give sensible advice/guesses without knowing which test is failing. Maybe I missed this information in the replies (please CC the list if you want follow up answers from more than just David). I am not a GMP developer, but note that GMP is regularly tested with ubsan and results are included at <a href="https://gmplib.org/devel/tm/gmp/date.html" class="">https://gmplib.org/devel/tm/gmp/date.html</a>.</div><br class=""><div><blockquote type="cite" class=""><div class="">On Oct 25, 2019, at 15:32, David Blaikie via cfe-users <<a href="mailto:cfe-users@lists.llvm.org" class="">cfe-users@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">UBSan doesn't catch everything - you could also try ASan and/or valgrind, etc. (MSan if you want, but that's a bit fussier/more work to use)</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Oct 25, 2019 at 3:16 PM Hans Åberg <<a href="mailto:haberg-1@telia.com" class="">haberg-1@telia.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">That is the reason I tried the UBSan, but as it changes optimization, it does not wrok.<br class="">
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> On 26 Oct 2019, at 00:14, David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank" class="">dblaikie@gmail.com</a>> wrote:<br class="">
> <br class="">
> Yeah, coming across compiler bugs does happen - but more often it's bugs in input programs. (one of the reasons compiler engineers aren't likely to jump on reproducing and reducing misbehaving programs, because on the odds, it's not a bug in the compiler)<br class="">
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