[Bug c/69609] New: block reordering consumes an inordinate amount of time

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69609

            Bug ID: 69609
           Summary: block reordering consumes an inordinate amount of time
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 37545
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37545&action=edit
gzipped C source code

The attached code, when compiled by trunk gcc 6.0.0,
with flag -O2, seems to take about 17 minutes.

gcc 5.3.1 seems to take about 16 minutes for the same code.

In a private email, Jeffery Law says: 
>I do note that test is spending most of its time (90%) in block
>reordering, so you might want to go ahead and file it