Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

[Richard Henderson]

The following reply was made to PR optimization/10125; it has been noted by GNATS.

From: Richard Henderson <rth@redhat.com>
To: Glen Nakamura <glen@imodulo.com>
Cc: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, rth@gcc.gnu.org
Subject: Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2
Date: Sun, 23 Mar 2003 11:41:11 -0800

 On Sun, Mar 23, 2003 at 06:21:52PM +0000, Glen Nakamura wrote:
 > >     Not a bug.  Type-aliasing violation between "char **" and "unsigned **".
 > 
 > Actually, the test case uses "signed char **" and "unsigned char **"...
 > Not sure if that changes your analysis.
 
 No; the former was just a typo.
 
 
 r~

Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

[Glen Nakamura]

The following reply was made to PR optimization/10125; it has been noted by GNATS.

From: Glen Nakamura <glen@imodulo.com>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, rth@gcc.gnu.org
Cc:  
Subject: Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2
Date: Sun, 23 Mar 2003 18:21:52 +0000

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10125
 > State-Changed-From-To: analyzed->closed
 > State-Changed-By: rth
 > State-Changed-When: Sun Mar 23 02:57:36 2003
 > State-Changed-Why:
 >     Not a bug.  Type-aliasing violation between "char **" and "unsigned **".
 
 Actually, the test case uses "signed char **" and "unsigned char **"...
 Not sure if that changes your analysis.
 
 - glen

Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

[rth]

Synopsis: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

State-Changed-From-To: analyzed->closed
State-Changed-By: rth
State-Changed-When: Sun Mar 23 02:57:36 2003
State-Changed-Why:
    Not a bug.  Type-aliasing violation between "char **" and "unsigned **".

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10125

Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

[Steven Bosscher]

The following reply was made to PR optimization/10125; it has been noted by GNATS.

From: Steven Bosscher <s.bosscher@student.tudelft.nl>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, mast@lysator.liu.se,
	nobody@gcc.gnu.org, gcc-prs@gcc.gnu.org
Cc:  
Subject: Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused
 by -O2
Date: Sat, 22 Mar 2003 10:54:31 +0100

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10125
 
 The loop does terminate if I compile with "-O2 -fno-strict-aliasing" on
 i586-pc-linux-gnu.  The only differences in the .00.rtl dumps are changes
 like this (- = -O2, + = -O2 -fno-strict-aliasing):
 
  (insn 27 26 28 (nil) (set (reg/f:SI 66)
 -        (mem:SI (reg/v/f:SI 63) [6 S4 A32])) -1 (nil)
 +        (mem:SI (reg/v/f:SI 63) [0 S4 A32])) -1 (nil)
      (nil))
 
 Greetz
 Steven
 
 

Re: optimization/10125: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

[bangerth]

Old Synopsis: Infinite loop caused by -O2
New Synopsis: [3.2/3.3/3.4 regression] Infinite loop caused by -O2

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Sat Mar 22 04:57:44 2003
State-Changed-Why:
    Confirmed. A regression in 3.2/3.3/3.4 w.r.t. 2.95. Was
    broken sometime between 2.95 and 3.0.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10125