[Bug lto/65950] New: Loop is not vectorized with lto.

[Bug lto/65950] New: Loop is not vectorized with lto.

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

            Bug ID: 65950
           Summary: Loop is not vectorized  with lto.
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com
  Target Milestone: ---

If we compile attached test-case without lto, e.g. using -Ofast  and -fopenmp
loop in foo is vectorized but if we add -flto option it won't be vectorized.
The problem is 'exit' statement in main - if we change it to ordinary return
loop will be vectorized with lto too.

[Bug lto/65950] Loop is not vectorized with lto.

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

--- Comment #1 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
Created attachment 35432
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35432&action=edit
test-case to reproduce

Must be compiled with -Ofast and -fopenmp options.

[Bug lto/65950] Loop is not vectorized with lto.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This vectorized for me with GCC 5.1.0 on aarch64-linux-gnu.

[Bug lto/65950] Loop is not vectorized with lto.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Do we eventually think the loop is cold?

[Bug lto/65950] Loop is not vectorized with lto.

[ysrumyan at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65950

--- Comment #4 from Yuri Rumyantsev <ysrumyan at gmail dot com> ---
The function containing given loop is marked as:

foo/24 (foo) @0x7f39f4b84620
  Type: function definition analyzed
  Visibility: prevailing_def_ironly
  References: 
  Referring: 
  Read from file: /tmp/ccKAP5Mo.o
  Availability: local
  First run: 0
  Function flags: local nonfreeing_fn unlikely_executed
  Called by: main/23