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Hello, I wonder if llvm has pure range propagation pass. Is correlated value propagation that one? It seems that it is not directly deals with ranges. Maybe there any passes that simply contain some information about value ranges? Will symbolic value range propagation be done in some time? -------------- next part -------------- An HTML attachme...

Hi all, I am currently compiling R to RISC-V64 CPU and I think I have discovered a NA propagation failure. How R implements NA (not available) and NaN (not-a-number) is explained in detail here: https://stat.ethz.ch/pipermail/r-devel/2014-February/068380.html. In short, according to my understanding of R's convention, any calculation involving NA but no NaN should result in NA (called NA...

Constant propagation pass generates constant expression when undef is used in float instructions instead of propagating the undef value. ; Function Attrs: nounwind define float @_Z1fv() #0 { entry: %add = fadd fast float undef, 2.000000e+00 ret float %add } Becomes: ; Function Attrs: nounwind define float @_Z1fv...

On 12/9/13 2:13 PM, Raoux, Thomas F wrote: > > Constant propagation pass generates constant expression when undef is > used in float instructions instead of propagating the undef value. > > ; Function Attrs: nounwind > > define float @_Z1fv() #0 { > > entry: > > %add = fadd fast float undef, 2.000000e+00 > > ret float %add >...

Here we use a (custom-made, internal) password propagation system, hooked around 'check password script'. Recently we suffer a network outgage (another one ;-), and the system that take care of password propagation goes offline. + NT domains continue to work, clearly password not propagate + AD domain stop to work (eg, users password change on...

----- Original Message ----- > From: "Philip Reames" <listmail at philipreames.com> > To: llvmdev at cs.uiuc.edu > Sent: Tuesday, December 10, 2013 2:55:36 PM > Subject: Re: [LLVMdev] Float undef value propagation > > > > On 12/9/13 2:13 PM, Raoux, Thomas F wrote: > > > > > > Constant propagation pass generates constant expression when undef is > used in float instructions instead of propagating the undef value. > > > > ; Function Attrs: nounwind >...

Hello. I'm writing an LLVM pass that is working on LLVM IR. To my surprise the following LLVM pass code generates optimized code - it does copy propagation on it. Value *vecShuffleOnePtr = Builder.CreateGEP(ptr_B, vecShuffleOne, "VectorGep"); ... packed_gather_params.push_back(vecShuffleOnePtr); CallInst *callGather = Builder.CreateCall(func_llvm_masked_gather_v128i16,...

...) "fdiv %x, undef" is now folded to undef. The code comment states this is done because undef might be a sNaN. We can't rely on sNaNs as they can either be masked or the platform might not have FP exceptions at all. Nevertheless, such folding is still correct due to the NaN propagation rules we found in the Standard - undef might be chosen to be a NaN and its payload will be propagated. Moreover, this looks similar to (3) and can be folded to a NaN. /Is it worth doing?/ (5) fdiv undef, undef -> undef ---------------------------------------------------...

Hi all, I am trying to see how single llvm optimizations work by running them one by one with opt and looking how the IR changes.Since I was interested in seeing how constant propagation was working I tried to run opt on the Sparse Conditional Constant Propagation, however by passing as argument -S -sccp -die it does not change anything in the output IR code. I attached the file with the source code I used, I think that the x value in that example should be propagated in the mul in...

...as From: llvmdev-bounces at cs.uiuc.edu<mailto:llvmdev-bounces at cs.uiuc.edu> [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Philip Reames Sent: Tuesday, December 10, 2013 12:56 PM To: llvmdev at cs.uiuc.edu<mailto:llvmdev at cs.uiuc.edu> Subject: Re: [LLVMdev] Float undef value propagation On 12/9/13 2:13 PM, Raoux, Thomas F wrote: Constant propagation pass generates constant expression when undef is used in float instructions instead of propagating the undef value. ; Function Attrs: nounwind define float @_Z1fv() #0 { entry: %add = fadd fast float undef, 2.000000e+00 ret float...

...R0 = R0 + R1 R10 = R2 * R10; R3 = R3 + R10; END_REPEAT; REDUCE R3; R0 = R5; // basically unnecessary reg. copy END_REPEAT; The above code has the deficiencies created basically by PHI elimination and not applying a proper register copy propagation on machine instructions before Register Allocation. I see 3 options to address my problem: - implement a case that handles this in PHI elimination (PHIElimination.cpp); - create a new pass that does copy propagation (based on DFA) on machine instructions before Register Alloca...

...h> void f1(int a) { a=a+1; printf("%d",a); } void f2() { int b; b=1; f1(b); } int main() { int a=1; f2(); f1(a); } Also,when i use the following command: opt -print-after-all main.bc The dumps generated dont include IPCP or Intraprocedural Const Propagation dumps.Why so? Is there any other way to see the effect of a pass on the i/p bitcode file? Kindly let me know where i am going wrong. Netra, >> ---------------------------- Original Message ---------------------------- >> Subject: Regarding Inter Procedural Constant Propagation >&...

Hello, I've filled a bug to track the issue we've recently seen in our LLVM-based compiler: the Correlated Value Propagation Pass may become significantly slow on certain files. According to opt time profiles, value propagation alone is very fast (less than 1 second), -O3 with value propagation turned off is acceptable (31 secs), but with value propagation included it becomes too slow (197 secs). http://llvm.org/bugs/s...

> On Dec 30, 2016, at 3:03 PM, Alex Susu via llvm-dev <llvm-dev at lists.llvm.org> wrote: > > Hello. > I'm writing an LLVM pass that is working on LLVM IR. > To my surprise the following LLVM pass code generates optimized code - it does copy propagation on it. It does *constant* propagation to be exact. > Value *vecShuffleOnePtr = Builder.CreateGEP(ptr_B, vecShuffleOne, "VectorGep"); > ... > packed_gather_params.push_back(vecShuffleOnePtr); > CallInst *callGather = Builder.CreateCall(func_llvm_masked_gat...

Hello, I wish to examine the influence of error in variables on my analyses via error propagation. I have a data frame (x) as follows: id response 1 -121 2 -131 3 -125 etc..... I wish to propagate errors for each row in the data frame, where error is distributed around the value of the response variable. To do this, I wish to simulate 1000 variables for each row in the above data f...

Dear R-helpers, I´m in the context of writing a general function for error propagation in R. There are somehow a few questions I would like to ask (discuss), as my statistical knowledge is somewhat restricted. Below is the function I wrote, the questions are marked. Many thanks in advance. propagate <- function(expr, varList, type = c("stat", "raw"), cov = TR...

...The code comment states this is done because undef might be a >> sNaN. We >> can't rely on sNaNs as they can either be masked or the platform >> might not have >> FP exceptions at all. Nevertheless, such folding is still correct due >> to the NaN >> propagation rules we found in the Standard - undef might be chosen to >> be a NaN >> and its payload will be propagated. >> Moreover, this looks similar to (3) and can be folded to a >> NaN. /Is it >> worth doing?/ > > As the current folding to undef is wrong, it h...

Hello Bernardo, --------- If I understood your problem this script solve your problem: q<-0.15 + c(-.1,0,.1) h<-10 + c(-.1,0,.1) 5*q*h [1] 2.475 7.500 12.625 --------- OK, this solves the simple example. But what if the example is not that simple. E.g. P = 5 * q/h Here, to get the maximum tolerances for P, we need to divide the maximum value for q by the minimum value for h, and

...sfers: SIP G.711 --> GSM IAX --> (wan) --> GSM IAX --> SIP G.711 - Sending custom parameters in URI: exten => 1,1,Setvar,VXML_URL=var1=value1 exten => 1,2,Dial,sip/192.168.0.1 I need to know if there is some possibilities for: 1) Automatic SIP header and/or uri-parameter propagation I need to propagate custom **headers** and/or **uri parameters** from source to destination. Does Asterisk propagate this additional info automatically? 2) Automatic SIP headers and/or uri-parameters propagation via IAX Yes, in wan communications I use 2 asterisk servers: SIP G.711 --> GSM...

On using builtin functions we have to move the input to registers $0 and $1, if one of the input value is an immediate, we fail to propagate the immediate: ... mov u32 $r477 0x00000003 (0) ... mov u32 $r0 %r473 (0) mov u32 $r1 $r477 (0) call abs BUILTIN:0 (0) mov u32 %r495 $r1 (0) ... With this patch the immediate is propagated, potentially causing the first MOV to be superfluous, which we'd