similar to: [LLVMdev] frontend support for cross-compilation?

Thanks Chris. I'll follow any ongoing discussion about this. Unless I'm missing something, customizable widths for integer types is necessary to achieve source-level compatibility with existing cross-compilers. It would be great to see the fronend being parameterized by integer widths at runtime. There would be no noticable loss of efficiency and this would avoid the obnoxious and

On Jul 1, 2008, at 9:45 PM, John Regehr wrote: > Thanks Chris. I'll follow any ongoing discussion about this. > Unless I'm > missing something, customizable widths for integer types is > necessary to > achieve source-level compatibility with existing cross-compilers. > > It would be great to see the fronend being parameterized by integer > widths > at

On Tue, 1 Jul 2008, John Regehr wrote: > Although the process of porting the LLVM backend to a new architecture > looks pretty straightforward (and is very well documented) there's a > frontend issue that I'm not clear on: > > How do we to tell the frontend about implementation-defined constants > like integer width? In other words, when llvm-gcc does a >

We have a bitwidth analysis that can be downloaded. It is not in LLVM. There should be a link in the paper: http://www.cs.utah.edu/~regehr/papers/pldi075-cooprider.pdf John Regehr

Hi, LLVMers, has someone implemented bitwidth analysis for LLVM? I was looking for something similar to the bitwise compiler described in "Bidwidth analysis with application to silicon compilation, by Mark Stephenson, Jonathan Babb and Saman Amarasinghe" e.g.: http://portal.acm.org/citation.cfm?id=349299.349317 all the best, Fernando

Chris, LLVM is an excellent piece of work, LLVM is one of the few project I know that has used the mysterious GCC front-end. I think it will be a great contribution to the community if you could writeup and document how to interface to the GCC front-end data-structures (like LLVM has done). Specifically: a) detail the gcc front-end tree data-structures b) how to go about interfacing to them

On Tue, Jan 26, 2010 at 7:42 PM, John Regehr <regehr at cs.utah.edu> wrote: >> Umm, can you find one that isn't a popcount implementation? > > Ok. > > MMX psadbw instruction: > > http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/CE/CE3DA132.shtml > > Position of first set bit: > >

On Sat, 10 Jul 2004, Ramu Ramamurthy wrote: > LLVM is an excellent piece of work, Thanks! > LLVM is one of the few project I know that has used the mysterious GCC > front-end. I think it will be a great contribution to the community if > you could writeup and document how to interface to the GCC front-end > data-structures (like LLVM has done). Specifically: > > a)

I checked out LLVM and configured like this: ./configure --prefix=/home/regehr --enable-optimized then built and installed it. Then, checked out the frontend, configured like this: ../configure --prefix=/home/regehr --enable-languages=c,c++ \ --enable-llvm=/home/regehr/z/llvm but when I try to build I get configure: error: You must specify valid path to your LLVM tree with

Hi, > ./configure --prefix=/home/regehr --enable-optimized ... > ../configure --prefix=/home/regehr --enable-languages=c,c++ \ > --enable-llvm=/home/regehr/z/llvm I think gcc from svn has checking enabled by default (which means it wants to use LLVM built with checking enabled). Try configuring llvm-gcc with --enable-checking=release or compile an unoptimized LLVM. Ciao, Duncan.

Dear John, thanks for pointing it to me. I just downloaded and installed CIL. However, I am getting an error when I run "make check", or when I try to compile the blink application, and I am sending you the error notice below. In any case, do you think it is possible to get some sort of 'dump' of the target C program with some bitwidth information, once I get your

Hi John, John Regehr wrote: > PredicateSimplifier is a pretty interesting pass, but it doesn't look > like opt invokes it at any standard -Ox level, and so I assume that > llvm-gcc also does not use this pass? If that is right, I'm curious > about why this is the case -- does it simply not provide enough code > speedup to compensate for the increase in compile time? I

PredicateSimplifier is a pretty interesting pass, but it doesn't look like opt invokes it at any standard -Ox level, and so I assume that llvm-gcc also does not use this pass? If that is right, I'm curious about why this is the case -- does it simply not provide enough code speedup to compensate for the increase in compile time? Also, a colleague and I (we both teach advanced

Hello, My problem is to add selinux policies can any help to say what is wrong with my policies I write this! semanage fcontext -a -t httpd_sys_rw_content_t "/var/www/html(/.*)?/ typo3conf(/.*)?" I have more instances from typo3 I found this construct in the selinux policies "/var/www/html(/.*)?/uploads(/.*)?" but my is not working ? and I have only errors? neverallow

On Thursday 14 February 2008 16:33:25 Chris Lattner wrote: > On Thu, 14 Feb 2008, Jon Harrop wrote: > > Does CLang use a suitable intermediate representation for this to be > > possible? > > The higher level IR that clang uses is basically a C AST. This interface > is under constant flux though. If you wanted to do this, it would be > very reasonable to just cons up

> Umm, can you find one that isn't a popcount implementation? Ok. MMX psadbw instruction: http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/CE/CE3DA132.shtml Position of first set bit: http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/1F/1F4003C7.shtml Log2 floor: http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/83/837A80E9.shtml Pixel format

Got a quick question regarding the latest and greatest: module ActionController module Routing SEPARATORS = %w( / ; . , ? ) Why is period (.) one of the separators? As it stands, the new routing code doesn''t recognize ''file.ext'' as the last component of a URL, which is sometimes defaulted to nil. See the generated code below. I don''t know everything

On Thu, 14 Feb 2008, Jon Harrop wrote: >> is under constant flux though. If you wanted to do this, it would be >> very reasonable to just cons up some C code and send it through the clang >> parser. Clang works great in a JIT environment. > > Great! Sounds like CIL should do the trick: > > http://manju.cs.berkeley.edu/cil/ Huh? -Chris --

Hello, I have a dataframe with a column 'col' of expressions of the form 2*3+4*5+6*7 and substrings thereof. Now >eval(2*3+4*5+6*7) is ok. But I want it done on that column... nothing seems to work Even > cil <- dataframe$col >eval(cil[1]) 2*3+4*5+6*7 I want the elements of the column evaluated. Thanks, A. Mani Member, Cal. Math. Soc [[alternative HTML version

Hi folks, Below is a short list of integer undefined behaviors executed by Clang when compiling the LLVM test suite. They seem pretty self explanatory, but let me know if not, if you cannot reproduce any of them, or if it would be better for me to file bugzillas on them. This is on x64 Linux, using r108984. Thanks, John --------------------------------- CLANG UNDEFINED at