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optimization/4432: ICE when using -march=k6 -O2
- To: gcc-gnats at gcc dot gnu dot org
- Subject: optimization/4432: ICE when using -march=k6 -O2
- From: reichelt at igpm dot rwth-aachen dot de
- Date: 1 Oct 2001 09:34:23 -0000
- Cc: lgb at lgb dot hu
- Reply-To: reichelt at igpm dot rwth-aachen dot de
>Number: 4432
>Category: optimization
>Synopsis: ICE when using -march=k6 -O2
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Mon Oct 01 02:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Volker Reichelt
>Release: gcc 3.0.1 and 3.0.2 20010924 (prerelease)
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
Compiling the following lines of code with -march=k6 -O2
using gcc version 3.0.2 20010924 (prerelease) will crash
the compiler:
int i, *p;
int f()
{
i;
*p = !i;
}
I get the following error message:
bug.c: In function `f':
bug.c:7: Unrecognizable insn:
(insn 36 18 25 (parallel[
(set (reg:SI 1 edx [45])
(const_int 0 [0x0]))
(clobber (reg:CC 17 flags))
] ) -1 (nil)
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
bug.c:7: Internal compiler error in insn_default_length, at insn-attrtab.c:223
Please submit a full bug report, etc.
Remarks:
* I distilled this example from Gábor Lénárt's bug report
(http://gcc.gnu.org/ml/gcc-bugs/2001-09/msg00856.html).
* The problem is probably related to PR 4415.
* It's a regression from gcc 3.0.
>How-To-Repeat:
gcc -O2 -march=k6 -c <filename>
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: