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...n't work in this case).<br /><br />Minor note: You're using 'int' for data, than multiply by 0.25 (divide by 4) and than write it back to 'int'. This will cost you 2 conversion to/from double while you may just place (...) / 4  which should be optimized to simple sequecnce with shifts (not to single shift due to signedness, but still better than conversions with changes of element size 4->8->4 and data size INT->FP->INT).<br /><br />And by the way why do you divide by 4, not by 5 as number of points suggest?<br /><br />Serge Preis&...

...ase). >> >> Minor note: You're using 'int' for data, than multiply by 0.25 (divide by >> 4) and than write it back to 'int'. This will cost you 2 conversion to/from >> double while you may just place (...) / 4 which should be optimized to >> simple sequecnce with shifts (not to single shift due to signedness, but >> still better than conversions with changes of element size 4->8->4 and data >> size INT->FP->INT). >> >> And by the way why do you divide by 4, not by 5 as number of points >> suggest? >> >...

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