search for: stripmine

...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 timeouts with -polly-dependences-computeout=0 - Avoid sign extensions by replacing all 32-bit ints with longs, as Polly seems to model using 64-bit loop counters - Avoid interrupting control flow through -ffast-math and moving mallocs to the top of the code So to compile, we have: c...

...ts 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 timeouts with -polly-dependences-computeout=0 >> - Avoid sign extensions by replacing all 32-bit ints with longs, as >> Polly seems to model using 64-bit loop counters >> - Avoid interrupting control flow through -ffast-math and moving mallocs >> to the t...

...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 -mllvm -polly -mllvm > -polly-vectorizer=stripmine -o stencil_poly.ll > > Please specify what is wrong with my code? > > > On Sat, Jul 1, 2017 at 4:08 PM, hameeza ahmed <hahmed2305 at gmail.com> > wrote: > >> Hello, >> >> I am trying to vectorize following stencil code; >> >> #include <std...

Hello, I am trying to vectorize following stencil code; #include <stdio.h> #define N 100351 // This function computes 2D-5 point Jacobi stencil void stencil(int a[restrict][N]) { int i, j, k; for (k = 0; k < 100; k++) { for (i = 1; i <= N-2; i++) { for (j = 1; j <= N-2; j++) { a[i][j] = 0.25 * (a[i][j] + a[i-1][j] + a[i+1][j] + a[i][j-1] +

...hmed2305 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 -mllvm -polly -mllvm >>> -polly-vectorizer=stripmine -o stencil_poly.ll >>> >>> Please specify what is wrong with my code? >>> >>> >>> On Sat, Jul 1, 2017 at 4:08 PM, hameeza ahmed <hahmed2305 at gmail.com> >>> wrote: >>> >>>> Hello, >>>> >>>> I a...

...305@gmail.com</a>> wrote:<br />>>> I even tried polly but still my llvm IR does not contain vector instructions. i used the following command;<br />>>><br />>>> clang  -S -emit-llvm stencil.c -march=knl -O3 -mllvm -polly -mllvm -polly-vectorizer=stripmine -o stencil_poly.ll<br />>>><br />>>> Please specify what is wrong with my code?<br />>>><br />>>> On Sat, Jul 1, 2017 at 4:08 PM, hameeza ahmed <<a href="mailto:hahmed2305@gmail.com">hahmed2305@gmail.com</a>> wr...

...;> >>> 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 -mllvm -polly -mllvm >> >>> -polly-vectorizer=stripmine -o stencil_poly.ll >> >>> >> >>> Please specify what is wrong with my code? >> >>> >> >>> On Sat, Jul 1, 2017 at 4:08 PM, hameeza ahmed <hahmed2305 at gmail.com> >> >>> wrote: >> >>>> Hello, >>...

Hi Tobias, according to [1], we can expect 90% of the turbo boost peak of the processor with a C version of Matrix-Matrix Multiplication that is similar to the one presented in [1]. In case of Intel Core i7-3820 SandyBridge, the theoretical maximal performance of the machine is 28.8 gflops and hence the expected number is 25,92 gflops. However, in case of, for example, n = m = 1056 and k = 1024

...tiling -polly-vectorizer - Select the vectorization strategy =none - No Vectorization =polly - Polly internal vectorizer =stripmine - Strip-mine outer loops for the loop-vectorizer to trigger (If I grep the polly source for 'canonicalize' I see the module pass class PollyCanonicalize). What am I missing? Thanks, Frank

In the 2018 LLVM DevMtg [1], I presented some shortcomings of how LLVM optimizes loops. In summary, the biggest issues are (a) the complexity of writing a new loop optimization pass (including needing to deal with a variety of low-level issues, a significant amount of required boilerplate, the difficulty of analysis preservation, etc.), (b) independent optimization heuristics and a fixed pass

I have posted a patch that switches the API to one that supports this (yet non-existent functionality) earlier: https://reviews.llvm.org/D24631 The comments from that were incorporated into the following RFC. Motivation: Certain targets feature "variable-sized" registers, i.e. a situation where the register size can be configured by a hardware switch. A common instruction set