[Bug optimization/9383] -fomit-frame-pointer has no effect on nested functions

[Bug optimization/9383] -fomit-frame-pointer has no effect on nested functions

[dhazeghi@yahoo.com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9383


dhazeghi@yahoo.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
  GCC build triplet|                            |i686-pc-linux-gnu
   GCC host triplet|                            |i686-pc-linux-gnu
 GCC target triplet|                            |powerpc-elf
   Last reconfirmed|0000-00-00 00:00:00         |2003-06-04 17:44:11
               date|                            |


------- Additional Comments From dhazeghi@yahoo.com  2003-06-04 17:44 -------
Confirmed still present with gcc 3.3. branch and mainline (20030513).

Dara



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[Bug optimization/9383] -fomit-frame-pointer has no effect on nested functions

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9383


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2003-06-04 17:44:11         |2003-08-18 01:56:56
               date|                            |


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-18 01:56 -------
Note the PPC only happens on powerpc-elf and powerpc-eabi, it does not happen on powerpc-
darwin6.6 or powerpc-aix5.1.

[Bug target/9383] -fomit-frame-pointer has no effect on nested functions

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-11-23 08:07 -------
Looks like this is an effect of the SYSV ABI.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|optimization                |target


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9383

[Bug target/9383] [SYSV] stack frame always made for nested functions

[amodra at bigpond dot net dot au]

------- Additional Comments From amodra at bigpond dot net dot au  2004-11-27 05:37 -------
This is because g1 is allocated space on the stack as a result of the following
code in expand_function_start.  If a function has local variables (including
hidden ones like this one) then it needs a stack frame.  Other ABIs can create
leaf functions having local vars without necessarily creating a stack frame.

  /* If function gets a static chain arg, store it in the stack frame.
     Do this first, so it gets the first stack slot offset.  */
  if (current_function_needs_context)
    {
      last_ptr = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
            Summary|[SYSV] -fomit-frame-pointer |[SYSV] stack frame always
                   |has no effect on nested     |made for nested functions
                   |functions                   |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9383