similar to: [LLVMdev] Announcement: Version 2013.1 of LLBMC available

On Tue, Feb 7, 2012 at 4:58 AM, Carsten Sinz <carsten.sinz at kit.edu> wrote: > Perhaps some of you might be interested in this: > -- Carsten > > > ################################################################## > > *---------------------------------------------------* > * LLBMC: The Low-Level Bounded Model Checker * > * for C (and C++)

This looks very interesting. Do you plan to make the source code publicly available? -Hal On Tue, 2012-02-07 at 01:58 +0100, Carsten Sinz wrote: > Perhaps some of you might be interested in this: > -- Carsten > > > > > ################################################################## > > > *---------------------------------------------------* > *

Perhaps some of you might be interested in this: -- Carsten ################################################################## *---------------------------------------------------* * LLBMC: The Low-Level Bounded Model Checker * * for C (and C++) programs is now available! * * Version 2012.1 * *

We are very pleased to announce that a new version of LLBMC is available for download at http://llbmc.org. LLBMC is a high-precision static analyzer based on LLVM implementing a technique called "Bounded Model Checking". LLBMC can detect errors such as: - Illegal memory accesses (e.g., buffer overflows) - Integer overflows - Division by zero - Invalid bit shifts - Double frees

LLBMC http://llbmc.org uses bounded model checking technique to find errors in LLVM IR.Model checking is essentially search, and since LLBMC is bounded, the search for errors is usuallyincomplete, hence the approach may not verify the entire program, however, it may be goodenough to find interesting errors. Best wishes,Andrew On Monday, 8 February 2016, 21:54, Scott Santucci via llvm-dev

I'd just like to thank everyone who replied on this; the suggestions and resources are very helpful! ~Scott On Tue, Feb 9, 2016 at 8:38 PM, Andrew Santosa <santosa_1999 at yahoo.com> wrote: > LLBMC http://llbmc.org uses bounded model checking technique to find > errors in LLVM IR. > Model checking is essentially search, and since LLBMC is bounded, the > search for errors

Hi, We are developing a bounded model checker for C/C++ programs (http://baldur.iti.kit.edu/llbmc/) that operates on LLVM's intermediate representation. While checking a C++ program that uses STL containers we noticed that llvm-gcc and clang handle pointer differences in disagreeing ways. Consider the following C function: int f(int *p, int *q) { return q - p; } Here's the

Hi Stephan, > We are developing a bounded model checker for C/C++ programs > (http://baldur.iti.kit.edu/llbmc/) that operates on LLVM's intermediate > representation. While checking a C++ program that uses STL containers > we noticed that llvm-gcc and clang handle pointer differences in > disagreeing ways. > > Consider the following C function: > int f(int *p, int *q)

Hi everyone, we'd like to be able to check for loss of information in trunc operations in our LLVM-based bounded model checker [1]. For this it is important if the trunc was on a signed or unsigned integer, so we need nsw and nuw flags for this. Would you accept a patch that adds these flags to LLVM (and possibly clang)? Regards, Florian [1] http://baldur.iti.uka.de/llbmc/

Hello, all, My name is Scott Santucci and I'm a software developer kicking around various wild ideas. (I wish I had something more interesting to say about myself than that, but nothing comes to mind; my day job is in SQL and Java, nothing to do with LLVM.) I am wondering whether anyone has tried using LLVM to apply formal verification to program code. I'm thinking about trying to

*** CLANG RELATED JOB ANNOUNCEMENT *** The Apple compiler team is seeking an engineer to play a pivotal role in bringing Clang's static analyzer bug-finding tool to the next level. We are interested in improving both the core analysis algorithms as well as implementing new analyses to find more kinds of bugs (with an immediate focus on security issues). As a key member of the Apple Compiler

James Zern wrote: > On Tue, Nov 28, 2017 at 3:22 PM, James Zern <jzern at google.com> wrote: >> On Mon, Nov 20, 2017 at 1:07 PM, James Zern <jzern at google.com> wrote: >>> Just an attempt to avoid overflows with an explicit check, I don't know if >>> there's a better way to identify corrupt input here. >>> >>> James Zern (2):

Ping for comments. Thanks, Linfeng On Wed, Apr 26, 2017 at 2:15 PM, Linfeng Zhang <linfengz at google.com> wrote: > On Tue, Apr 25, 2017 at 10:31 PM, Jean-Marc Valin <jmvalin at jmvalin.ca> > wrote: > >> >> > A_Q28 is split to 2 14-bit (or 16-bit, whatever) integers, to make the >> > multiplication operation within 32-bits. NEON can do 32-bit x

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Hi Kevin, > 1. Most compiler and back-end control of floating point behavior appears to be > motivated by controlling the loss or gain of a few low bits of precision on > a whole module scale. In fact, these concerns are usually insignificant for > programmers of floating-point intensive applications. The input to most > floating point computations have far lower

The LangRef says this for left shifts: "If the nsw keyword is present, then the shift produces a poison value if it shifts out any bits that disagree with the resultant sign bit." ... (1) followed by "As such, NUW/NSW have the same semantics as they would if the shift were expressed as a mul instruction with the same nsw/nuw bits in (mul %op1, (shl 1, %op2))." ... (2) But

Hi Jean-Marc, Thanks! Please find the 2 updated patches which only optimize stride 2 case and keep the bit exactness. They have passed our internal tests as usual. Thanks, Linfeng On Mon, May 15, 2017 at 9:36 AM, Jean-Marc Valin <jmvalin at jmvalin.ca> wrote: > Hi Linfeng, > > Sorry for the delay -- I was actually trying to think of the best option > here. For now, my

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On Tue, Jan 23, 2018 at 18:21:38 +0100, Thomas Robers wrote: > Hello, > > I'm using Dovecot 2.3 and sometimes i get this: > > --- snip --- > Jan 23 14:23:13 mail dovecot: imap(bob at tutech.de)<4880><PDqibHFjMvrAqG1n>: > Panic: data stack: Out of memory when allocating 134217768 bytes Interesting... imap is trying to allocate 128MB and failing. A couple of

On Tue, Apr 25, 2017 at 10:31 PM, Jean-Marc Valin <jmvalin at jmvalin.ca> wrote: > > > A_Q28 is split to 2 14-bit (or 16-bit, whatever) integers, to make the > > multiplication operation within 32-bits. NEON can do 32-bit x 32-bit = > > 64-bit using 'int64x2_t vmull_s32(int32x2_t a, int32x2_t b)', and it > > could possibly be faster and less