[Bug target/12395] Suboptimal code with global variables

[steven at gcc dot gnu dot org]

------- Comment #14 from steven at gcc dot gnu dot org  2008-09-21 13:52 -------
Here is the .final_cleanup dump, fwiw:


;; Function foo (foo)

foo ()
{
  int a.1;

<bb 2>:
  a.1 = a + 1;
  a = a.1;
  if (a.1 != 0)
    goto <bb 3>;
  else
    goto <bb 4>;

<bb 3>:
  a = [plus_expr] a.1 + 1;

<bb 4>:
  return;

}

which translates (on Cygwin) to:

        .file   "t.c"
        .text
        .p2align 4,,15
.globl _foo
        .def    _foo;   .scl    2;      .type   32;     .endef
_foo:
        movl    _a, %edx
        leal    1(%edx), %eax
        movl    %eax, _a
        testl   %eax, %eax
        je      L3
        addl    $2, %edx
        movl    %edx, _a
L3:
        rep
        ret


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2008-09-21 13:49:47         |2008-09-21 13:52:33
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12395