https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71647
Bug ID: 71647 Summary: aligned(x:32) in #pragma omp simd does not work Product: gcc Version: 6.1.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: niva at niisi dot msk.ru Target Milestone: --- Created attachment 38759 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38759&action=edit The source file to reproduce the problem. I use gcc (GCC) 6.1.1 20160623. The command line is: gcc -O3 -S -mavx -fopt-info-vec-optimized -fopenmp-simd test1a.c When I use #pragma omp simd aligned(a,b:32) in the source file (see attachment), the compiler reports: test1a.c:9:8: note: loop vectorized test1a.c:9:8: note: loop peeled for vectorization to enhance alignment But when I use #pragma omp simd aligned(a,b:4*sizeof(double)), the alignment is taken into account, and the compiler output is: test1a.c:9:8: note: loop vectorized gcc 5.3.1 works ok in both cases.