[Bug optimization/10463] -fssa-ccp ICE

[Bug optimization/10463] -fssa-ccp ICE

[pinskia at physics dot uc dot edu]

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10463


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From pinskia at physics dot uc dot edu  2003-07-08 01:20 -------
-fssa-* is going to be removed for 3.4 see <http://gcc.gnu.org/ml/gcc/2003-07/
msg00078.html> for more info. Closing.

[Bug rtl-optimization/10463] -fssa-ccp ICE

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-08-25 13:15 -------
A possible patch is here: 
  http://gcc.gnu.org/ml/gcc-patches/2004-08/msg01913.html 
 
W. 
 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gdr at gcc dot gnu dot org,
                   |                            |stevenb at suse dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10463

[Bug rtl-optimization/10463] -fssa-ccp ICE

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2004-08-25 13:17 -------
Steven, Gaby, you wondered whether this is a regression. Indeed it is. 
Here is a small testcase: 
---------------- 
bool should_exit; 
 
void foo() { 
  int i = 0; 
  while(!should_exit) { 
    int num = 1; 
    if (num) 
      for (int * it; num && it != 0; ) 
        if (*it <= 1) 
          if (i < 1) 
            i = 1; 
  } 
} 
------------------------- 
It compiles with 3.2.3, but ICEs with 3.3.4: 
 
g/x> /home/bangerth/bin/gcc-3.2.3/bin/c++ -c -fssa -fssa-ccp -O2 x.cc 
 
g/x> /home/bangerth/bin/gcc-3.3.4-pre/bin/c++ -c -fssa -fssa-ccp -O2 x.cc 
x.cc: In function `void foo()': 
x.cc:13: internal compiler error: Segmentation fault 
Please submit a full bug report, 
with preprocessed source if appropriate. 
See <URL:http://gcc.gnu.org/bugs.html> for instructions. 
 
Of course the flags were abandoned in 3.4 and later, so it doesn't trigger 
there at all. 
 
Steven, you may want to check whether your patch fixes this problem. 
 
W. 

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10463

[Bug optimization/10463] -fssa-ccp ICE

[dnovillo@redhat.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=10463



------- Additional Comments From dnovillo@redhat.com  2003-05-23 00:51 -------
Subject: Re: [Bug optimization/10463] -fssa-ccp ICE

On Thu, 2003-05-22 at 09:56, pinskia@physics.uc.edu wrote:

> Since -fssa* options are experimental should we remove them, since the tree-ssa branch is 
> coming on good now.
> 
Ah, but -fssa is for RTL.  There are plans to do a higher-level RTL that
may use most of the existing implementation.


Diego.





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