[Bug tree-optimization/85212] New: Parallelizable loop isn't unrolled [regression bug?]

[robertw89 at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85212

            Bug ID: 85212
           Summary: Parallelizable loop isn't unrolled [regression bug?]
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: robertw89 at googlemail dot com
  Target Milestone: ---

The compiler fails to unroll the loop (partially).

compiled with -O3  -mavx  -mavx2  -mfma -fno-math-errno -ffast-math   
-floop-parallelize-all -ftree-parallelize-loops=8

void testAutoParr(int *x) {
    for (int i = 0; i < 1000; i++){
        x[2*i+1] = x[2*i];
    }
}