similar to: [LLVMdev] Loop exit condition analysis

On Mon, Dec 19, 2011 at 10:13 PM, Hanfeng Qin <hanfengtsin at gmail.com> wrote: > Hi all, > I am doing loop exit condition analysis. As the following sample code > segments demonstrated, > > .... > int *c = &a; > while (*c == 0); > .... > > I want to decide which variables are related to ending this spin-loop. E.g., > in above sample, c is the direct

Hi all, I got a question on loop exit condition identification based on LLVM. I made an assumption first that loop exit conditions are located in exiting basic blocks. Then I use loop->getExitingBlocks() to get all BBs. However, this policy seemed not work for combinational exit conditions, e.g. compounding conditions consists of conditions with logical predicates. *The problem is that

Hello all, I caught a problem related to pthread library. I built llvm and llvm-gcc then compiling a multithreaded benchmark written in POSIX thread library. The command "llvm-gcc -o bench bench.c -lpthread" ran well while "llvm-gcc -c bench; llvm-ld -o bench bench.o -lpthread" crashed. It told that "llvm-ld: error: Cannot find library 'pthread'". I could

Hi chenwj, According to the link, I found that during the compiling process, the option "-emit-llvm" must be added to generate immediate object *.o. [hanfeng at os-wstation02 fft]llvm-gcc -c fft.c -emit-llvm Then using llvm-ld will generate two files - a shell excutable and a llvm bytecode data both of which would run perfect. [hanfeng at os-wstation02 fft]llvm-ld -o FFT fft.o [hanfeng

> Hi chenwj, > If it use system pthread library, then it should find it in the stand search path. I also added the option "-L/usr/lib -L/usr/lib64" but it still failed. Don't know if the link below helps or not, http://lists.cs.uiuc.edu/pipermail/llvmdev/2009-November/027274.html Regards, chenwj -- Wei-Ren Chen (陳韋任) Computer Systems Lab, Institute of Information

> According to the link, I found that during the compiling process, the option "-emit-llvm" must be added to generate immediate object *.o. > [hanfeng at os-wstation02 fft]llvm-gcc -c fft.c -emit-llvm "-emit-llvm" emits object file which contains LLVM bitcode (IR). Default file name suffix is .o, but you might want to use "-o fft.bc" to make the suffix

Hi chenwj, For the first question, even if I did not specify "-o fft.bc", it still generated fft.o which is also a llvm bitcode file. For the second question, I intended to generate a native executable "FFT". However, it only generate a llvm bitcode file fft.bc and a native POSIX shell excuatable named fft. Howerver, the contents of the shell executable fft is a wrapper to call

LLVM3.8 version. https://bugs.llvm.org//show_bug.cgi?id=24233. The example can catch exception. But I use my own code for testing, CustomEHMemoryManager allocated memory address is very large, allocateCodeSection, allocateDataSection assigned address (more than 32 bit address space) is getting smaller and smaller. Cause registerEHFrames to fail. 3.9.1 or 4.0.0 version has been supported on win

For help: Llvm generated instruction calls a function (extern), the function will have a SEH exception (EXCEPTION_ACCESS_VIOLATION), But JIT can not capture the exception of the EXCEPTION_ACCESS_VIOLATION. I saw Bug 24233. EXCEPTION_ACCESS_VIOLATION exception cannot be captured after modification. How to catch EXCEPTION_ACCESS_VIOLATION exceptions on win64 ? haifeng.qin at wellintech.com

I would like to understand your opinion a little more deeply. Are you suggesting that it's easier to (prepare the container and add a line at runtime) compared to (add a line to an sshd config at runtime)? The latter scenario would be the case if the patch is merged. Or did you mean that it's easier to prepare the container than to implement a correct patch into sshd to enable the option

it's not just adding a line at runtime. it's the openssh maintainers maintaining an odd codepath and testing it at each release and answering questions about the configuration, etc. On Thu, Jun 27, 2024 at 3:00?PM Henry Qin <hq6 at cs.stanford.edu> wrote: > > I would like to understand your opinion a little more deeply. > > Are you suggesting that it's easier to

Hi David and Mats, Thanks for your explanation. If my understanding is correct, it means we don't need to consider the side-effect of malloc/free unless compiling with -ffreestanding. Because without -ffreestanding, user defined malloc/free should be compatible with std library. It makes sense to me. My point is, in std library, malloc is allowed to return null if this malloc failed. Why

Hi, there, I cannot get accurate value for calculation. for example: ld<-sqrt(1*0.05*0.95*0.05*0.95) 0.05*0.95-ld=-6.938894e-18 0.05*0.95-ld==0 is False. I met this problem in my program, how can I handle it. Thanks. xj.

Thanks for the pointer! I played around with PamServiceName set to 'sshd_disable_auth' and got it working with the minimum contents below in the file /etc/pam.d/sshd_disable_auth. auth required pam_permit.so account required pam_permit.so session required pam_permit.so Thus, this does indeed enable disabling authentication. Unfortunately, as far as I can tell, only root can create files

Hi, there: When plot ann predicted results I need to indicate numbers of inputs for each column. V1 V2 V3 V4 1 86.2700 49.9380 30.7630 0.1327 2 89.5127 55.9707 33.7683 0.1186 3 91.1833 58.4670 34.5610 0.1134 matplot(t, pch = 1:4, type = "o", col = rainbow(ncol(t)),xlab = "No. of inputs ", ylab = "Mean of 6 Datasets",

Hi all, Partial unrolling and runtime unrolling are enabled by default in aarch64 gcc which is help to get performance better. But these two methods are enabled for only several backends in LLVM which are X86, PowerPC and R600. I don't know the history of these two kinds of unrolling, and why they are not widely used. I also want to know is, for aarch64 backend, is it intentionally to get

Hi, I was unable to find a bug report for this with a cursory search, but would like clarification if this is intended or unavoidable behaviour: ```{r} # Create example data.frames parents <- data.frame(name=c("Sarah", "Max", "Qin", "Lex"), sex=c("F", "M", "F", "M"),

i'm not a maintainer, but my personal opinion is that it's probably easier to prepare a container with this pam configuration On Thu, Jun 27, 2024 at 2:26?PM Henry Qin <hq6 at cs.stanford.edu> wrote: > > Thanks for the pointer! > I played around with PamServiceName set to 'sshd_disable_auth' and got it working with the minimum contents below in the file

dear all I got this error when I try to use libspeex in visual studio. when I include speex/speex_echo.h, it complains about unresolved external symbol _speex_echo_state_init. And when I include mdf.c into the source, it generates whole bunch of errors. Any idea? thanks so much --------------------Configuration: audio - Win32 Debug-------------------- Compiling... mdf.c C:\Documents and

Hi Mats, I think Kevin's point is malloc can return 0, if malloc/free pair is optimized way, the semantic of the original would be changed. On the other hand, malloc/free are special functions, but programmers can still define their own versions by not linking std library, so we must assume malloc/free always have side-effect like other common functions, unless we know we will link std