similar to: Jacobi 5 Point Stencil Code not Vectorizing

Does it happen due to loop carried dependence? if yes what is the solution to vectorize such codes? please reply. i m waiting. On Jul 1, 2017 12:30 PM, "hameeza ahmed" <hahmed2305 at gmail.com> wrote: > I even tried polly but still my llvm IR does not contain vector > instructions. i used the following command; > > clang -S -emit-llvm stencil.c -march=knl -O3

I am able to vectorize it with the following code; #include <stdio.h> #define N 100351 // This function computes 2D-5 point Jacobi stencil void stencil(int a[][N], int b[][N]) { int i, j, k; for (k = 0; k < N; k++) { for (i = 1; i <= N-2; i++) for (j = 1; j <= N-2; j++) b[i][j] = 0.25 * (a[i][j] + a[i-1][j] + a[i+1][j] + a[i][j-1] + a[i][j+1]); for

<div> </div><div> </div><div>Hello,</div><div> </div><div>To me this is an issue in llvm loop vectorizer (if N is large enough to prevent complete unrolling of j-loop).</div><div> </div><div>Woud you mind to share stencil.ll than I would say more definitely what the issue

Your problem is due to GVN partial reduction elimination (PRE) which introduces a PHI node the current loop vectorizer cannot handle: opt -O3 stencil.ll -pass-remarks=loop-vectorize -pass-remarks-missed=loop-vectorize -pass-remarks-analysis=loop-vectorize remark: <unknown>:0:0: loop not vectorized: value that could not be identified as reduction is used outside the loop remark:

I have matrix multiplication and stencil code. I vectorise it through the following command. opt -S -O3 -force-vector-width=2048 stencil.ll -o stencil_o3.ll in both the examples of matrix mult and stencil it vectorises fine when my loop iterations >2048. but if i keep both iterations and vector width=2048. it produces scalar code IR not vectorizes it. Is it llvm bug? Please help me.

http://idisk.mac.com/jdeleeuw-Public/jacobi This is paper/software for various techniques based on Jacobi plane rotations. There is R code for -- classical cyclical Jacobi Eigen diagonalization -- Jacobi-based SVD diagonalization -- approximate simultaneous diagonalization of symmetric matrices (De Leeuw/Pruzansky 1978) -- approximate simultaneous diagonalization of rectangular matrices

Who can send to me code that can perform in R-plus jacobi.root, scre.eq, cgf.0, cgf.1 and cgf.2 that are part of the S-plus package? Marc D. Brodsky

I've decided to try Zanzarah in both wine 1.2.2 and in latest release 1.3.27 None works... :( Here is the terminal output in 1.3.27: ... DFMT_R8G8_SNORM_L8X8_UNORM to floating point. err:d3d_surface:surface_convert_color_to_float Unhandled conversion from WINED3DFMT_R8G8_SNORM_L8X8_UNORM to floating point. err:d3d_surface:surface_convert_color_to_float Unhandled conversion from

On Tue, Aug 20, 2013 at 07:44:39AM +0200, leroy christophe wrote: > > > Find attached two patches I have in order to build klibc 2.0.2 > against kernel 3.8.13 > We had to introduce those patches when going from kernel 3.6 to kernel 3.7 > Hope it helps. > those patches are wrong and again very brittle. just use the way it is described in `make help': A) cd ~/src/linux

Hi, Recently I was looking at the potential of optimizing through Polly. The code that I am trying to optimize [1] adjusts a picture's colors to get an Instagram-like effect. To improve code analyzability on LLVM 3.9.0, I made the following changes: - Improve SCoP detection through -polly-process-unprofitable - Enable outer loop vectorization through -polly-vectorizer=stripmine, disabling

I've tried to run demo of Hard Reset and it has two big problems on Wine. First is that mouse isn't working. You get input only from keyboard but that can be solved with raw input patch. I used the one that is working with Deus Ex: Human Revolution: http://dl.dropbox.com/u/6901628/raw2.patch but second is much worse. Basically almost all of the textures aren't rendered. It starts

All the density estimators I've found in R seem to force the ends to go to zero. What can we do if we don't believe that, e.g., with something that might be a uniform distribution or a truncated normal with only observations above mu+sigma observed? The closest I could come to this was to artificially extend the numbers beyond the range, thereby forcing the density estimator

Hi! When compiling the attached module with the JIT engine on an Intel KNL I see wrong code getting emitted. I attach a complete exploit program which shows the bug in LLVM 3.8. It loads and JIT compiles the module and prints the assembler. I stumbled on this since the result of an actual calculation was wrong. So, it's not only the text version of the assembler also the machine

Hi Johannes, Perfect, thanks! The CFG now looks very similar to what I got on LLVM 3.9.0 ([1] vs [2]). Any idea why setting -simplifycfg-sink-common=false is necessary? Similar to LLVM 5.0.1, the default for 3.9.0 is true [3], and setting it to false wasn't necessary in the latter version. [1] https://nautilus.bjornweb.nl/files/polly501-cfg-simplifycfg-sink-common.pdf [2]

Thank You. Right now to see the effect i did following changes; unsigned X86TTIImpl::getRegisterBitWidth(bool Vector) { if (Vector) { if (ST->hasAVX512()) return 65536; here i changed 512 to 65536. Then in loopvectorize.cpp i did following; assert(MaxVectorSize <= 2048 && "Did not expect to pack so many elements" " into

i removed printf from loop. Now getting no error. but the IR doesnot contain vectorized code. IR Output is as follows: ; ModuleID = 'sum-vec.ll' source_filename = "sum-vec.c" target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-unknown-linux-gnu" ; Function Attrs: norecurse nounwind readnone uwtable define i32 @main(i32, i8**

On Wed, Aug 21, 2013 at 01:39:50PM +0200, leroy christophe wrote: > > Le 21/08/2013 12:20, maximilian attems a ?crit : > >On Tue, Aug 20, 2013 at 07:44:39AM +0200, leroy christophe wrote: > >>Find attached two patches I have in order to build klibc 2.0.2 > >>against kernel 3.8.13 > >>We had to introduce those patches when going from kernel 3.6 to kernel 3.7

Hi Frank, I recommend trying trunk LLVM. AVX-512 development has been very active recently. -Hal ----- Original Message ----- > From: "Frank Winter via llvm-dev" <llvm-dev at lists.llvm.org> > To: "LLVM Dev" <llvm-dev at lists.llvm.org> > Sent: Wednesday, June 29, 2016 2:41:39 PM > Subject: [llvm-dev] avx512 JIT backend generates wrong code on <4

Greetings everybody! For anybody working on blur-related things, take a look at this glitch I encountered: https://bugs.freedesktop.org/show_bug.cgi?id=10275 Best regards... Mirco "MacSlow" M?ller -- email - macslow@bangang.de www - http://macslow.thepimp.net lowfat - http://macslow.thepimp.net/sponsor-it

https://bugs.freedesktop.org/show_bug.cgi?id=48742 Bug #: 48742 Summary: fbotexture -arb misrenders on nv43 Classification: Unclassified Product: Mesa Version: git Platform: x86 (IA32) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/DRI/nouveau