[Bug rtl-optimization/21887] New: missed optimization with globals

[Bug rtl-optimization/21887] New: missed optimization with globals

[pinskia at gcc dot gnu dot org]

In the following code we produce an extra la.

int curr_state_graph_pass_num = 0;
void
pass_states (void)
{
  curr_state_graph_pass_num++;
}

We currently produce at -O2 -mdynamic-no-pic:
_pass_states:
        lis r9,ha16(_curr_state_graph_pass_num)
        la r9,lo16(_curr_state_graph_pass_num)(r9)
        lwz r2,0(r9)
        addi r2,r2,1
        stw r2,0(r9)
        blr

We should be able to produce the following instead:
_pass_states:
        lis r9,ha16(_curr_state_graph_pass_num)
        lwz r2,lo16(_curr_state_graph_pass_num)(r9)
        addi r2,r2,1
        stw r2,lo16(_curr_state_graph_pass_num)(r9)
        blr

-- 
           Summary: missed optimization with globals
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: minor
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: powerpc-darwin


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21887

[Bug rtl-optimization/21887] missed optimization with globals

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|minor                       |enhancement


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21887

[Bug rtl-optimization/21887] missed optimization with globals (-mdynamic-no-pic)

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-12 03:47 -------
Confirmed, -fno-PIC works and so does -fPIC but -mdynamic-no-pic does not for some reason.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2005-06-12 03:47:17
               date|                            |
            Summary|missed optimization with    |missed optimization with
                   |globals                     |globals (-mdynamic-no-pic)


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21887

[Bug rtl-optimization/21887] missed optimization with globals (-mdynamic-no-pic)

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-08-10 20:31 -------
Subject: Bug 21887

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	pinskia@gcc.gnu.org	2005-08-10 20:31:30

Modified files:
	gcc            : ChangeLog 

Log message:
	forgot to add the PR marker:
	
	2005-08-10  Andrew Pinski  <pinskia@physics.uc.edu>
	
	PR target/21887
	* config/darwin.c (machopic_indirect_data_reference): Use a new register
	for the high part when generating dynamic-no-pic code.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.9697&r2=2.9698



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21887

[Bug rtl-optimization/21887] missed optimization with globals (-mdynamic-no-pic)

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-08-10 20:31 -------
Fixed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.1.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21887