[Bug target/17451] New: ICE at insn-output.c:1495 with -O1

[Bug target/17451] New: ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

$ gcc -O1 txc_compress_dxtn.i 
txc_compress_dxtn.i: In function `fancybasecolorsearch': 
txc_compress_dxtn.i:2585: internal compiler error: in output_151, at 
insn-output.c:1495 
 
Testacase is attached. Smells like a {middle,back}end bug. 
I can't test with 3.4.2 atm, sorry if it was already fixed.

-- 
           Summary: ICE at insn-output.c:1495 with -O1
           Product: gcc
           Version: 3.4.1
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P2
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bernie at develer dot com
                CC: gcc-bugs at gcc dot gnu dot org
GCC target triplet: i386-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-09-13 02:51 -------
Created an attachment (id=7117)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7117&action=view)
testcase


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[belyshev at lubercy dot com]

------- Additional Comments From belyshev at lubercy dot com  2004-09-18 17:41 -------
// small testcase. Note: this code is valid, so changing keyword.

int foo (int b)
{
  int i;
  char c[2];
  
  for (i = 0; i < 1; i ++);
  
  c[0] += 2;
  return b / c[0] < 0;
}


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
 GCC target triplet|i386-redhat-linux           |i*86-*-*
           Keywords|ice-on-invalid-code         |ice-on-valid-code
      Known to fail|                            |3.4.1 3.4.3
      Known to work|                            |3.3.5
   Last reconfirmed|0000-00-00 00:00:00         |2004-09-18 17:41:31
               date|                            |
            Summary|ICE at insn-output.c:1495   |[3.4 Regression] ICE at
                   |with -O1                    |insn-output.c:1495 with -O1
   Target Milestone|---                         |3.4.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-09-18 18:51 -------
I cannot reproduce this with GCC 3.4.0 (i686-cygwin), nor 4.0.0 (i686-linux).

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|3.3.5                       |3.3.5 3.4.0 4.0.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-09-19 22:20 -------
The simplified testcase ICEs only at -O1, not at -O3.
The original testcase didn't work with anything above -O1.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-09-20 00:27 -------
Both testcases do indeed work with 3.4.3 from CVS.

It may be one of those intermittent middle-end bugs
that keep reappearing as other parts of the compiler
change, but we don't know for sure.

For now, we may assume the problem has already been
properly fixed and close this bug.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
      Known to fail|3.4.1 3.4.3                 |3.4.1
      Known to work|3.3.5 3.4.0 4.0.0           |3.3.5 3.4.0 3.4.3 4.0.0
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[belyshev at lubercy dot com]

------- Additional Comments From belyshev at lubercy dot com  2004-09-20 05:53 -------
No, this bug is not fixed. There was no changes in 3.4 CVS since last time I
checked. Both testcases still failing with current 3.4 CVS.

Note this ICE does _not_ appear with -mtune=i686, pentium2 or pentium3.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
      Known to fail|3.4.1                       |3.4.1 3.4.3
      Known to work|3.3.5 3.4.0 3.4.3 4.0.0     |3.3.5 3.4.0 4.0.0
         Resolution|FIXED                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-09-20 07:47 -------
Weird.  Here (i686-pc-linux-gnu) I see different results:

 $ /usr/local/src/gcc/i386-linux-3.4-install/bin/gcc -v
 Reading specs from
/usr/local/src/gcc/i386-linux-3.4-install/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
 Configured with: ../gcc-3.4/configure
--prefix=/usr/local/src/gcc/i386-linux-3.4-install --enable-languages=all
--enable-shared --enable-threads=posix --with-system-zlib --enable-__cxa_atexit
--disable-gdbtk --enable-sim --enable-multi-ice --enable-libgcj-multifile
 Thread model: posix
 gcc version 3.4.3 20040919 (prerelease)
 $ /usr/local/src/gcc/i386-linux-3.4-install/bin/gcc -O1 -c foo.c
 (OK)
 
 $ /usr/bin/gcc -v
 Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.1/specs
 Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux
 Thread model: posix
 gcc version 3.4.1 20040831 (Red Hat 3.4.1-10)
 $ /usr/bin/gcc -c -O foo.c
 foo.c: In function `foo':
 foo.c:10: internal compiler error: in output_151, at insn-output.c:1495

How did you exactly configure your compiler?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[belyshev at lubercy dot com]

------- Additional Comments From belyshev at lubercy dot com  2004-09-20 13:32 -------
(In reply to comment #7)

Hi Bernardo,

>/usr/local/src/gcc/i386-linux-3.4-install/lib/gcc/i686-pc-linux-gnu/3.4.3/specs

I see you configured gcc with target 'i686-pc-linux-gnu', this means -mtune=i686
by default. So, this is why your compiler works fine (see my note in comment #6).

> How did you exactly configure your compiler?

./configure --enable-languages=c --with-arch=athlon-xp

I am seeing ICE with these -mtune values: i386, i486, i586, k6, athlon, k8, c3,
winchip


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-09-20 14:44 -------
(In reply to comment #8)

> Hi Bernardo,
> >/usr/local/src/gcc/i386-linux-3.4-install/lib/gcc/i686-pc-linux-gnu/3.4.3/specs
> 
> I see you configured gcc with target 'i686-pc-linux-gnu', this means
-mtune=i686 by default. So, this is why your compiler works fine
> (see my note in comment #6).

You're right.

> I am seeing ICE with these -mtune values: i386, i486, i586, k6, athlon, k8,
c3, winchip

Confirmed.


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2004-09-18 17:41:31         |2004-09-20 14:44:04
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[rth at gcc dot gnu dot org]

------- Additional Comments From rth at gcc dot gnu dot org  2004-10-16 00:08 -------
I can't reproduce this today.  Can anyone else?

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[bernie at develer dot com]

------- Additional Comments From bernie at develer dot com  2004-10-16 00:44 -------
I can still see it with a recent snapshot from RawHide:

 gcc version 3.4.2 20041006 (Red Hat 3.4.2-5)

So unless it has been accidentally fixed during the last
10 days, the bug is still in 3.4-branch.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[belyshev at lubercy dot com]

------- Additional Comments From belyshev at lubercy dot com  2004-10-16 00:50 -------
Still ICEs on today's 3.4 branch. (Note comment #8).

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2004-09-20 14:44:04         |2004-10-16 00:50:13
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[mmitchel at gcc dot gnu dot org]

------- Additional Comments From mmitchel at gcc dot gnu dot org  2004-11-01 00:44 -------
Postponed until GCC 3.4.4.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4.3                       |3.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451

[Bug target/17451] [3.4 Regression] ICE at insn-output.c:1495 with -O1

[belyshev at lubercy dot com]

------- Additional Comments From belyshev at lubercy dot com  2004-12-06 15:58 -------
Was fixed by this patch:

2004-10-18  Jakub Jelinek  <jakub@redhat.com>

	* config/i386/i386.md (addqi_1_slp): Test for incdec_operand
	operand 1 instead of 2

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
      Known to fail|3.4.1 3.4.3                 |3.4.1 3.4.2
      Known to work|3.3.5 3.4.0 4.0.0           |3.3.5 3.4.0 3.4.3 4.0.0
         Resolution|                            |FIXED
   Target Milestone|3.4.4                       |3.4.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17451