similar to: constrained input for optimization algorithm

Hello, all, I had problems with an extension to a classic optimization problem. The target is to minimize a quadratic form a'Ma with respect to vector b, where vector a=(b',-1)', i.e., a is the expand of b, and M is a symmetric matrix (positive definite if needed). One more constrain on b is b'b=1. I want to solve b given M. I tried but it seems impossible to find an analytic

Dear R users, I hope to explain the concepts of skewness and kurtosis by generating series of distributions with same skewness and different kurtosis or with same kurtosis and different skewness, but it seems that i cannot find the right functions. I have searched the mailing list, but no answers were found. Is it possible to do that in R? Which function could be used? Thanks a lot. --

Hello List I'm working on a combinatoric problem in which the object is to minimize the badness() of a vector. I think this class of problem is only soluble by optim() using method=SANN. The badness() of anything is >= 0, and when I've found a solution with zero badness, I want optim() to stop (carrying on beyond zero badness cannot improve the solution). Efficiency is crucial here.

HI, Do anyone know where btrfs_print_tree is invoked? thanks. -- Regards, Zhi Yong Wu -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html

Hi Hal, Thanks for the pointer. Is it possible to get the processor ID on X86 architecture? There is a library call in linux, sched_getcpu(), to the ID. Also, is it possible to get the program counter in the IR? Best, Zhi On Thu, Nov 19, 2015 at 1:33 PM, Hal Finkel <hfinkel at anl.gov> wrote: > Hi Zhi, > > There is no standard (architecture-independent) way to get the processor

Thanks, Mats. Actually, it is able to generate the assembly now if I use the follow command: clang++ -O3 -S -mllvm --x86-asm-syntax=intel -mno-sse -o test_nosee.s test.cpp However, when I use g++ -O3 -o test_nosse test_nosse.s -lm to generate the executable, if gives me the following errors: Error: too many memory references for `sub' Error: too many memory references for `mov' Error:

Hi Shahid, Thank you so much for your response. You suggested approach is what I am right now using. However, it seems that the overhead is a little bit high because we are introducing two more instructions. I was wondering if there was a cheaper way to do it. Best, Zhi On Mon, May 4, 2015 at 2:12 AM, Shahid, Asghar-ahmad < Asghar-ahmad.Shahid at amd.com> wrote: > Hi Zhi, > >

Say if we have 8 cores, I want to get which core is running the current program. Thanks. On Thu, Nov 19, 2015 at 3:37 PM, Hal Finkel <hfinkel at anl.gov> wrote: > ----- Original Message ----- > > From: "zhi chen" <zchenhn at gmail.com> > > To: "Hal Finkel" <hfinkel at anl.gov> > > Cc: llvm-dev at lists.llvm.org > > Sent: Thursday,

Thanks, Shahid. It is fixed now. On Fri, Apr 17, 2015 at 8:50 PM, Shahid, Asghar-ahmad < Asghar-ahmad.Shahid at amd.com> wrote: > Hi zhi, > > > > You have to also pass the value type to getDecalaration() API such as > > > > Value* sqrtv = Intrinsic::getDeclaration(M, Intrinsic::x86_sse2_sqrt_pd, > v->getType()); > > > > Regards, > >

Is it possible to load a value into a vector register and broadcast it in LLVM? For example, for the following address %x %x = getelementptr inbounds %struct._Ray* %ray, i32 0, i32 0, i32 0 instead of loading the value at %x into a scalar register %0: %0 = load double* %x, align 4, !tbaa !0 I want to load it into a <2 x double> vector register %1 and make both of the two elements in %1

Hi, I am wondering if it is possible to get the time-stamp and the processor ID where an instruction is exectued in the IR? Thanks for your help in advance:) Best, Zhi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20151119/dbbafb32/attachment.html>

It seems that the problem was because I used builder.CreateFAdd to create a <2 x double> vectortype FADD instruction. It works if I use it to create the scalar version FADD. I want to have an instruction like: *%2 = fadd <2 x double> undef, <2 x double> undef. *The following is the way I used to create the vectorized FADD instruction: //pInst is a double type instruction

I got it. Thanks, Nick. So, it is back to the previous problem. If I have the following instruction: %3 = fadd double %1, double %2 I want to change it into %6 = fadd <2 x double> %4, double %5 where %4 = <double %1, double %1>, %5 = <double %2, double %2>, how can I do this? Thanks, Best On Fri, Apr 17, 2015 at 1:56 AM, Nick Lewycky <nicholas at mxc.ca> wrote: >

Got it. Thanks. I will try it with the trunk version. On Wed, Jan 20, 2016 at 1:36 PM, Tim Northover <t.p.northover at gmail.com> wrote: > Hi Zhi, > On 20 January 2016 at 13:33, zhi chen <zchenhn at gmail.com> wrote: > > Thanks for your response. The attached is the .bc file after my pass. I > > could generate the assembly with -mcpu=skx but not with

Thanks for your response, Sanjay. I know there are intrinsics available in C/C++. But the problem is that I want to instrument my code at the IR level and generate those instructions. I don't want to touch the source code. Best, Zhi On Fri, Jan 22, 2016 at 4:54 PM, Sanjay Patel <spatel at rotateright.com> wrote: > I was just looking at the related masked load/store operations, and

Does the insert point also mean inserting before the instruction? On Tue, Apr 21, 2015 at 3:36 PM, Daniel Berlin <dberlin at dberlin.org> wrote: > IRBuilder takes an insertion point. > Use it? > > > On Tue, Apr 21, 2015 at 3:17 PM, zhi chen <zchenhn at gmail.com> wrote: > > The current instruction is: > > > > Instruction *pInst; > > > >

Hi all, I am using gather intrinsic to load a value from the same address twice at the same time. Basically, I used my own pass to changed the following bitcode: %a = getelementptr inbounds [100 x double], [100 x double]* %A, i32, 0, i64 0 %1 = load double, double* a, align to: %a = getelementptr inbounds [100 x double], [100 x double]* %A, i32, 0, i64 0 %splat.a = insertelement <2 x

Thanks Nick, that's something what I am trying to implement as the following. But it seems I still only get the constant value not the instruction. Could you please go over the following instruction and see what wrong with it? Thanks for your time again. Value *vecVal = NULL; IRBuilder<> builder(&*pInst); Type *vecTy = VectorType::get(Type::getDoubleTy(ctxt), 2); Value

Value * is the instruction. use dyn_cast<Instruction> to get to it. On Thu, Apr 16, 2015 at 11:39 PM zhi chen <zchenhn at gmail.com> wrote: > But IRBuilder.CreateXYZ only returns a "VALUE" type. Can I get the > instruction created by it? For example, > > IRBuilder<> builder(&*pinst); > Value *val = builder.CreateFAdd(LV, RV, ""); >

Has anyone had problems accessing random websites since going up to 6.4? Since about the day after I got partly upgraded, if I try to access nytimes.com, or orbitz.com, I get server not found. With a lot of work, I, my manager, and the other admin, found that setting options edns0 in /etc/resolv.conf fixed it - I suspect that the network folks updated their internal nameservers (which are M$)