search for: 100351

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]...

...; 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 <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++) >>...

Hello, After generating AVX code for large no of iterations i came to realize that it still uses only 2 registers zmm0 and zmm1 when the loop urnroll factor=1024, i wonder if this register allocation allows operations in parallel? Also i know all the elements within a single vector instruction are computed in parallel but does the elements of multiple instructions computed in parallel? like are

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] + a[i][j+1]...

...5:11, "hameeza ahmed via llvm-dev" <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>>:<div><div>> further i modified the code to the following;<br />><br />> #include <stdio.h><br />> #define N 100351<br />><br />> // This function computes 2D-5 point Jacobi stencil<br />> void stencil(int a[restrict][N], int b[restrict][N])<br />> {<br />>    int i, j, k;<br />>    for (k = 0; k < N; k++) {<br />>        for (i = 1; i <= N-2;...

...t; suggest? >> >> Serge Preis >> >> >> 02.07.2017, 05:11, "hameeza ahmed via llvm-dev" <llvm-dev at lists.llvm.org>: >> > further i modified the code to the following; >> > >> > #include <stdio.h> >> > #define N 100351 >> > >> > // This function computes 2D-5 point Jacobi stencil >> > void stencil(int a[restrict][N], int b[restrict][N]) >> > { >> > int i, j, k; >> > for (k = 0; k < N; k++) { >> > for (i = 1; i <= N-2; i++) >>...

David, So here are the two patches. Remove all patches that you have and apply these. The first one is straight forward. The second one will hopefully fix the livelock issue you have been encountering. People reviewing the patches should note that the second one is slightly different than the one I posted earlier. It removes the BUG_ON in the if condition where we jump to update_holders. The