similar to: about formal verification about Xen

Hi Zhongxing, On 4/8/07, Zhongxing Xu <xuzhongxing at gmail.com> wrote: > I think the real difficult thing in path sensitive program analysis (or > symbolic execution) is not the lack of decision procedures, but the > translation of arbitrary pointer operations and library function calls in > C/C++ program into the mathematics supported by the automated theorem > prover. >

Dear LLVMers, This email is intended for those interested in path-sensitive analysis, integer overflow analysis, static analysis, and (perhaps) loop invariant computation. Traditionally, such analyses have been considered too expensive to be practical, and were mostly an academic curiosity. The core of the problem is the lack of adequate automated decision procedures which could quickly

IMO super optimizer would yield less benefits on LLVM compared to other compilers. If you check the patch of the instcombine pass, you'll find out people keep dragging "correct" optimization out, not because the optimization violates the semantic of LLVM IR, but it will generate wrong code sequences when lowering to machine code. An example: %3 = fcmp %1, %2 %6 = fcmp %4, %5 %7 =

How about state of SVA (Secure Virutal Archtecture)? It seems there is no any demo or prototype produced. Cheers, Liu Jian ---- email to: gjk.liu at gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100420/e8dc1b16/attachment.html>

On 4/9/07, Domagoj Babic <babic.domagoj at gmail.com> wrote: > > > Traditionally, such analyses have been considered too expensive to be > practical, and were mostly an academic curiosity. The core of the > problem is the lack of adequate automated decision procedures which > could quickly determine whether a set of constraints is satisfiable or > not, and if it is

On Oct 22, 2008, at 5:47 PM, Kenneth Boyd wrote: > One generalization I would like to see (perhaps after spending enough > time to understand how to safely inject attributes or _Pragma via > macros) is how to make an assert generate syntax errors when it is > provably violated even in release mode. I like this idea. Sounds good. One can imagine enrolling static analysis and

Hello all, thanks for the feedback! It sounds like you are planning to follow the approach of Joshi, Nelson and > Randall ("Denali: A Goal-directed Superoptimizer") in that you don't intend > to exhaustively enumerate all possible code sequences, and see if they are > the same as the original only better; but instead start from the original > code > sequence and

This example is caused by R's messing with formula environments. That's explained in ?formula, but should it not be explained in ?model.frame ? Simple test: data <- data.frame(y=rnorm(100), x=1:100) testit <- function(formula) { weights <- runif(100) glm(formula, weights=weights, data=data) } testit(y ~ x) weights is looked for in the environment of the formula, not of

Hello Everybody, I have a problem with the output of lm. In fact, when I compare the R output and the Splus output, the results appears to be different : I have a dataframe with 5 factors , 16 rows and a response. First, I tried to fit this response to a linear model : lm(rep~(A+B+C+D+E),data). The results beetween SPlus and R are different. In a second time, I tried a new fit :

Hi, I'd like to link Clang against the STP theorem prover. Since Clang is built by the LLVM build system, I hope this is the correct place to ask for advice. The attached patch allows me to pass `configure` a --with-stp option and provide a path to the install prefix for STP. However, I am not familiar with autoconf, so I am not confident that my changes are the correct way to do this. I

I would not have expected this upon implementing sieve. And I really need to get around this limitation. LDA has no problem writing to these large mbox files. Why does sieve have a problem with them? This is very odd. May 10 17:45:04 greer dovecot: deliver(stan): write() failed with mbox file /home/stan/mail/1-Debian-Users: File too large May 10 17:45:04 greer dovecot: deliver(stan): write()

Whenever I try to read or modify ACLs from my Windows 2000 PDC, my Samba Domain Member Server (Security = ADS) does not allow setting ACLs, nor does it display the existing ACLs. - I have setup ACLs in my Kernel - I have translated and installed libacl and libattr - I can see and modify ACLs with getfacl and setfacl. - I have translated Samba 3.0.23d with --with-acl-support=yes - I have enabled

Dear Isabelle, for most of my work I have switched from S-Plus to R, because it is easier to make scripts with due to the better documentation and some other more reasonable implementations. And there was also a cost issue with the S-Plus Server, which is not for free at all. In R I use the its package for time series, which is quite sufficient for my needs. The only problem I encountered was

Dear R developpers, I am a user of Splus since many years and I have developped lots of functions to plot graph of data and model results of irregular or regular times series. In Splus regular times series are created using the rts function and irregular time series using the its functions. In both cases, times is given as a numeric vector. There is no problem in plotting a regular and an

Hello all, I have posted this before and received no response so I am providing more info this time. I am on Linux kernel 2.2.5-15 and running Samba 2.0.6 as the Samba server. The client is a Windows NT 4.0 machine. When browsing from the NT machine (as user administrator), any share I access appears to contain the contents I put in my own share on the server. This is causing a problem because

Hi, I'm new to the LLVM mailing list, but I've been working on tools for symbolic execution/formal modeling of LLVM off and on for a while. I’m trying to understand the current status of the LLVM undef/poison semantics from a frontend/verification perspective. I saw there was a lot of interest in a proposed semantics in late 2016 and mid-2017. Perhaps this was due to the “Taming

Hi, I am brand new to LLVM, or more precisely, trying to be. I'm getting stuck on compiling LLVM. - I tried installing on a Mint 18.1 VM with 6GB RAM, and the builds of some large executables were killed by the OOM killer. I finally realized that I needed to build using shared libraries, and succeeded. This was in November. - I put aside my LLVM project, and just got back to it. I got stuck

Hello R-users, I would like to install the Java package delivered by the Omegahat project. I'm working on a Windows NT4.0 workstation. Can someone explain me ( in details please) the way to install this package. I've already read the doc relative to this topic, but I'm afraid to be too bad in Informatic to understand really well the install process. I hope someone has an answer for

Hello, I would like to know if there is a possibility to "clean" the R memory during a R session. In fact, I realize a lot of instruction with large objects (matrix of 500*5000), and I can not manage to achieve the end of my script due to memory lack. Of course, I've tried to remove all "temporary object" during the script execution and to perform a garbage collector ...

Hello, I would like to treat a very simple case : to fit a linear model with 5 parameters (including main terms, interactions and quadratic terms using a central composite design with 27 runs) for a constant response (e.g resp = 100.0). The fitting process works and return me a good intercept value (the value of my constant) and some negligeable effects (around e-15). But, I don't understand