similar to: Non-determinism in LLVM codegen

Everyone, The following patch to reverse iterate SmallPtrSet's has now been merged: https://reviews.llvm.org/D26718 This is how LLVM behavior will change due to this patch: - In LLVM builds with *assertions enabled*, SmallPtrSet's would always be reverse iterated by default. This default behavior can be overridden via the flag "-mllvm -reverse-iterate=<true/false>".

> On 2016-Nov-15, at 15:16, Hal Finkel <hfinkel at anl.gov> wrote: > > ----- Original Message ----- >> From: "Mandeep Singh via llvm-dev Grang" <llvm-dev at lists.llvm.org> >> To: llvm-dev at lists.llvm.org, "mehdi amini" <mehdi.amini at apple.com>, dexonsmith at apple.com, zinob at codeaurora.org >> Sent: Tuesday, November 15, 2016

On Tue, Dec 13, 2016 at 6:39 PM, Hans Wennborg <hans at chromium.org> wrote: > On Tue, Dec 13, 2016 at 4:57 PM, Grang, Mandeep Singh via llvm-dev > <llvm-dev at lists.llvm.org> wrote: >> Everyone, >> >> The following patch to reverse iterate SmallPtrSet's has now been merged: >> https://reviews.llvm.org/D26718 >> >> This is how LLVM

On Tue, Dec 13, 2016 at 4:57 PM, Grang, Mandeep Singh via llvm-dev <llvm-dev at lists.llvm.org> wrote: > Everyone, > > The following patch to reverse iterate SmallPtrSet's has now been merged: > https://reviews.llvm.org/D26718 > > This is how LLVM behavior will change due to this patch: > - In LLVM builds with assertions enabled, SmallPtrSet's would always be

I see that the following test fails if reverse iteration of SmallPtrSet is enabled: /clang/test/SemaCXX/warn-loop-analysis.cpp/ This is because in SemaStmt.cpp we iterate SmallPtrSet and output warnings about the variables not used in the loop. Expected output: /warning: variables 'i', 'j', and 'k' used in loop condition not modified/ Output with reverse iteration:

Hi all, Last year I had shared with the community my findings about instances of non-determinism in llvm codegen. The major source of which was the iteration of unordered containers resulting in non-deterministic iteration order. In order to uncover such instances we had introduced "reverse iteration" of unordered containers (currently only enabled for SmallPtrSet). I would now

On Thu, Jul 6, 2017 at 8:02 AM, Robinson, Paul via llvm-dev < llvm-dev at lists.llvm.org> wrote: > > > > -----Original Message----- > > From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of > > Grang, Mandeep Singh via llvm-dev > > Sent: Thursday, July 06, 2017 2:56 AM > > To: llvm-dev at lists.llvm.org > > Subject: [llvm-dev]

I'm sorry, but I don't think LLDB has any release notes. On Sat, Aug 26, 2017 at 9:49 PM, Kamil Rytarowski <n54 at gmx.com> wrote: > LLDB: > > Switched the NetBSD platform to new remote tracing capable framework. > > Preliminary support for tracing NetBSD(/amd64) processes and core files > with a single thread. > > On 25.08.2017 02:44, Hans Wennborg via

On Thu, Jul 6, 2017 at 12:34 PM, Sean Silva <chisophugis at gmail.com> wrote: > > > On Thu, Jul 6, 2017 at 10:20 AM, Daniel Berlin via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> >> >> On Thu, Jul 6, 2017 at 8:02 AM, Robinson, Paul via llvm-dev < >> llvm-dev at lists.llvm.org> wrote: >> >>> >>> >>>

Thanks for your response David. 1) I'm not sure it's do-able. I don't know of any nice way to track whether an ordered walk of an unordered container leaks out into the final output of the program. Only iterating over an unordered container is probably not a sufficient hint (it'd have a high false positive rate to warn on every instance of that) - and I don't have any

In the past, I had added the ability in LLVM to uncover 2 types of non-deterministic behaviors: iteration of unordered containers with pointer-like keys and sorting of elements with the same keys. Now, I wanted to add checkers for these (and other types of non-deterministic behaviors) so that they could be applied more widely. I also realize that not all of these may be doable at

On 30 August 2017 at 18:51, David Blaikie via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > > On Tue, Aug 29, 2017 at 11:45 AM Grang, Mandeep Singh via cfe-dev > <cfe-dev at lists.llvm.org> wrote: >> >> Hi All, >> >> I wanted to share a couple of updates on the effort to uncover >> non-determinism in LLVM through reverse iteration. >>

Hi All, I wanted to share a couple of updates on the effort to uncover non-determinism in LLVM through reverse iteration. 1. Reverse iteration has now been enabled for DenseMap (https://reviews.llvm.org/D35043) 2. We have setup a nightly reverse iteration buildbot (http://lab.llvm.org:8011/builders/reverse-iteration). This builds all LLVM targets with reverse iteration ON and runs ninja

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Joerg, Referring to your patch https://reviews.llvm.org/rL291172. / switch (MAI->getExceptionHandlingType()) {// // case ExceptionHandling::SjLj:// // case ExceptionHandling::DwarfCFI:// // case ExceptionHandling::ARM:// //*isCFIMoveForDebugging = true;*// //*if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)*/*/ /**/ break;/*/ // for (auto &F:

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Hi, I wanted to give a heads-up that I've been looking into replacing the AliasSetTracker(AST) with MemorySSA in the Loop Invariant Code Motion (LICM) pass. I would love to get feedback on the best way to incrementally push in this change. Motivation: There has been an outstanding issue with using the Alias Set Tracker due to its expensive construction time (quadratic). We've had test

Ping From: Mandeep Singh Grang [mailto:mgrang at codeaurora.org] Sent: Tuesday, February 03, 2015 4:34 PM To: 'llvmdev at cs.uiuc.edu' Cc: 'ghoflehner at apple.com'; 'apazos at codeaurora.org'; mgrang at codeaurora.org Subject: Question on Machine Combiner Pass Hi, In the file lib/CodeGen/MachineCombiner.cpp I see that in the function