[Bug middle-end/54921] New: [4.8 Regression] wrong code with -Os -fno-omit-frame-pointer -fsched2-use-superblocks -fstack-protector -ftree-slp-vectorize

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54921



             Bug #: 54921

           Summary: [4.8 Regression] wrong code with -Os

                    -fno-omit-frame-pointer -fsched2-use-superblocks

                    -fstack-protector -ftree-slp-vectorize

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: middle-end

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: zso...@seznam.cz





Created attachment 28441

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28441

reduced testcase



Output:

$ gcc -Os -fno-omit-frame-pointer -fsched2-use-superblocks -fstack-protector

-ftree-slp-vectorize testcase.c

$ ./a.out 

Aborted



(gdb) p a

$1 = {a = 1, b = '\000' <repeats 31 times>}

(gdb) p b

$2 = {a = 2, b = '\000' <repeats 31 times>}



Tested revisions:

r192420 - fail

4.7 r191640 - OK