I am currently trying to use some BLAS functions. I see the documentation and know what I want to use, but the described functions are nowhere in the actual source code in BLAS. I just don't get it.
I am trying to find blas_xmax_val. This is mentioned in the documentation on page 42. However, I do not see the function anywhere in the source folder.
If anyone has used BLAS before, please can you tell me what's going on here? Where am I supposed to look for it? It's not even mentioned in cblas.h.
This is not the only function with this problem. I see many functions mentioned in the documentation, but not in the source folder.
Please help!
I think this is the report of a technical forum that's recommending changes for BLAS that were just never adopted.
The only BLAS maximum functions I'm aware of are the IxAMAX() (x in {S,D,C,Z}) family, which return the index of the first occurrence of the maximum value.
The paper you point to is documentation for a code library created by its authors, and not a standard part of the C language. You have to get the code from them and install it, or find someone who has already done that. The code is freely available at http://netlib.org/blas/
A better-known library for doing this sort of thing is GSL, which might be easier to find an install (it's already installed on many Unix-like systems). http://www.gnu.org/software/gsl/
Related
I am modifying the code for glibc 2.5. Now since glibc is large and complex, I need to have a really good tool, to see interaction of different parts of the code. I am using Understand for this purpose, but Understood is only valid for 15 days. Afterwards you have to buy it.
So my question is, on web, are there sites where you can interactively understand common code bases such as glibc, gcc, linux kernel etc. I mean where you could search for some function, and then click on a function call to see its definition and such other useful features. I have used Koders.com, but it will only display the code, and is not interactive.
OpenGrok is good. You have to host it yourself though, it's not on the web.
I'm interested in reviewing some of the functions included in the string library for c, but I can't find the source code (literally, i.e. functions and all) online and I have no idea where to find it.
Thanks.
EDIT:
the link provided by pmg shows those functions divided into c files, so it's about what I needed. Thanks.
Take a look at redhat glibc. It appears to be somewhat current.
You'll find it in the source code of the gcc compiler.
http://www.gnu.org/software/gcc/
Usually included with the compiler that you install so this may vary. Also depends on the operating system your running. If you're using windows, I recommend you run a Windows search for strings.c and if you're running linux then you can use the find command.
Disregard the file I linked to prior to this edit. I should have verified the code before sending it. It didn't apply to your question. Sorry
Maybe you're looking for GNU C string.h?
You can check the source in any standard libc implementation http://www.gnu.org/software/libc/
I am interested in delving into Erlang's C source code and try to understand what is going on under the hood. Where can I find info on the design and structure of the code?
First of all, you might want to have a look to Joe Armstrong's thesis, introducing Erlang at a high level. It will be useful to get an idea of what was the idea behind the language. Then, you could focus on the Erlang Run Time System (erts). The erlang.erl module could be a good start. Then, I would focus on the applications who constitutes the so-called minimal release, kernel and stdlib. Within the stdlib, have a look on how behaviours are implemented. May I suggest the gen_server.erl module as a start?
A Guide To The Erlang Source
http://www.trapexit.org/A_Guide_To_The_Erlang_Source
The short answer is that there is no good guide. And the code is not very well documented.
I recommend finding someone in your neighbourhood that knows the code reasonably well, and buy them dinner in exchange for a little chat.
If you don't have the possibility to do that, then I recommend starting with the loader.
./erts/emulator/beam/beam_load.c
Some useful information can also be found by pretty printing the beam representation. I don't know whether there is any way to do so supplied by OTP, but the HiPE project has some cheats.
hipe:c(MODULE, [pp_beam]).
Should get you started.
(And I also recommend Joe's book.)
Pretty printer of beam can be done by 'erlc -S', which is equivalent with hipe:c(M, [pp_beam]) mentioned by Daniel.
I also use erts_debug:df(Module). to disassemble the loaded beam code, which are instructions actually been interpreted by the VM.
Sometimes I use a debugger. OTP delivers tools supporting gdb very well. See example usage at http://www.erlang.org/pipermail/erlang-questions/2008-September/037793.html
A little late to the party here. If you just download the source from GitHub the internal documentation is really good. You have to generate some of it using make.
Get the documentation built and most of the relevant source is under /erts (Erlang Run Time System)
Edit: BEAM Wisdoms is also a really good guide but it may or may not be what you're after.
This is my first embedded project, so bear with my ignorance. I've been asked to implement Remote NDIS over USB, using the ColdFire USB-Lite stack by CMX. I've been searching for a long time now, and can't find any clear documentation for this stack.
It comes with some woefully documented sample code and the only useful resource I've been able to find online is this Application Note (PDF) by Eric Gregori.
What I really want is an explanation of all the functions in the API. I can work out how to use them. Does this exist? Can someone point me to it?
EDIT: Nevermind.
After tracing the execution across 14 half-documented source files (from the example program) and scrutinizing a bunch of undocumented variables and buffers, and doing a diff between corresponding files in different projects, I think I finally get it. So I guess stackoverflow.com taught me patience... or something.
The link you referred to doesn't work for me, but the name of the file made me look at the Freescale pages, and if that's not the document you intended to link to, it might be the documentation you need.
I'm looking for a tool that, given a bit of C, will tell you what symbols (types, precompiler definitions, functions, etc) are used from a given header file. I'm doing a port of a large driver from Solaris to Windows and figuring out where things are coming from is getting to be difficult, so this would be a huge help. Any ideas?
Edit: Not an absolute requirement, but tools that work on Windows would be a plus.
Edit #2: To clarify what I'm trying to do, I have a codebase I'm trying to port, which brings in a large number of headers. What I'd like is a tool that, given foo.c, will tell me which symbols it uses from bar.h.
I like KScope, which copes with very large projects.
KScope http://img110.imageshack.us/img110/4605/99101zd3.png
I use on both Linux and Windows :
gvim + ctags + cscope.
Same environment will work on solaris as well, but this is of course force you to use vim as editor, i pretty sure that emacs can work with both ctags and cscope as well.
You might want give a try to vim, it's a bit hard at first, but soon you can't work another way. The most efficient editor (IMHO).
Comment replay:
Look into the cscope man:
...
Find functions called by this function:
Find functions calling this function:
...
I think it's exactly what are you looking for ... Please clarify if not.
Comment replay 2:
ok, now i understand you. The tools i suggested can help you understand code flow, and find there certain symbol is defined, but not what are you looking for.
Not what you asking for but since we are talking i have some experience with porting and drivers (feel free to ignore)
It seems like compiler is good enough for your task. You just starting with original file and let compiler find what missing part, it will be a lot of empty stubs and you will get you code compiled.
At least for beginning i suggest you to create a lot of stubs and modifying original code as less as possible, later on once you get it working you can optimize.
It's might be more complex depending on the type of driver your are porting (I'm assuming kernel driver), the Windows and Solaris subsystems are not so alike. We do have a driver working on both solaris and windows, but it was designed to be multi platform from the beginning.
emacs and etags.
And I leverage make to run the tag indexing for me---that way I can index a large project with one command. I've been thinking about building a master index and separate module indecies, but haven't gotten around to implementing this yet...
#Ilya: Would pistols at dawn be acceptable?
Try doxygen, it can produce graphs and/or HTML and highly customizable