[Bug tree-optimization/54981] New: [4.8 Regression] Different code generated with / without `-g'

[d.g.gorbachev at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54981



             Bug #: 54981

           Summary: [4.8 Regression] Different code generated with /

                    without `-g'

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: tree-optimization

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

        ReportedBy: d.g.gorbac...@gmail.com





Appeared between 20120513 (r187445) and 20120902 (r190863):



$ cat > 1.c

extern void bar(unsigned *, char *);



void foo(char *s)

{

  unsigned i;

  char t[2];



  bar(&i, t);



  for (i = 0; i < 2; i++)

    s[i] = t[i];

}

^D

$ gcc -S -O3 -fcompare-debug 1.c

gcc: error: 1.c: -fcompare-debug failure (length)



Also fails with `-O -ftree-loop-distribute-patterns'.