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Re: c/5250: ICE in print_rtl_and_abort, at flow.c:6458 with -O3
- From: Gwenole Beauchesne <gbeauchesne at mandrakesoft dot com>
- To: nobody at gcc dot gnu dot org
- Cc: gcc-prs at gcc dot gnu dot org,
- Date: 8 Feb 2002 20:46:02 -0000
- Subject: Re: c/5250: ICE in print_rtl_and_abort, at flow.c:6458 with -O3
- Reply-to: Gwenole Beauchesne <gbeauchesne at mandrakesoft dot com>
The following reply was made to PR c/5250; it has been noted by GNATS.
From: Gwenole Beauchesne <gbeauchesne@mandrakesoft.com>
To: dmuell@gmx.net, gerold.jury@utanet.at, joel@gcc.gnu.org, maciej@imsa.edu,
utx@penguin.cz, relf@os2.ru, snowwolf@one2one-networks.com,
gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org,
nobody@gcc.gnu.org, nottelm@uni-muenster.de
Cc:
Subject: Re: c/5250: ICE in print_rtl_and_abort, at flow.c:6458 with -O3
Date: Fri, 08 Feb 2002 23:09:39 +0100
Hi,
PR c/4257, PR c/5409, PR c/5250 appear to have been fixed in gcc-3.1
when Jan Hubicka killed jump_optimize:
<http://gcc.gnu.org/ml/gcc-patches/2001-07/msg01430.html> .
I don't know if I get it right but the following patch attempts to
disable the NOOP_MOVES jump_optimization prior to register renaming.
2002-02-08 Gwenole Beauchesne <gbeauchesne@mandrakesoft.com>
PR c/4257, PR c/5049, PR c/5250
* toplev.c (rest_of_compilation): Don't perform NOOP_MOVES
jump_optimization prior to register renaming. However, tidy the
CFG by deleting unreachable code.
* gcc.c-torture/compile/20020208-1.c: New test.
---
gcc-3.0.4/gcc/testsuite/gcc.c-torture/compile/20020208-1.c.no-noop_moves
Fri Feb 8 20:28:37 2002
+++ gcc-3.0.4/gcc/testsuite/gcc.c-torture/compile/20020208-1.c Fri
Feb 8 20:28:37 2002
@@ -0,0 +1,11 @@
+/* Origin: PR c/4257 from Volker Reichelt <reichelt@igpm.rwth-aachen.de>.
*/
+/* This testcase caused gcc-3.0.1 to ICE if compiled with -O1
+ -frename-registers. */
+
+void f ()
+{
+ unsigned int *p;
+ p++;
+ *p += *p / (*p < 2);
+}
+
--- gcc-3.0.4/gcc/toplev.c.no-noop_moves Fri Feb 8 20:01:51 2002
+++ gcc-3.0.4/gcc/toplev.c Fri Feb 8 20:01:51 2002
@@ -3546,9 +3546,8 @@
timevar_push (TV_FLOW2);
open_dump_file (DFI_flow2, decl);
- jump_optimize (insns, !JUMP_CROSS_JUMP,
- JUMP_NOOP_MOVES, !JUMP_AFTER_REGSCAN);
find_basic_blocks (insns, max_reg_num (), rtl_dump_file);
+ cleanup_cfg ();
/* On some machines, the prologue and epilogue code, or parts thereof,
can be represented as RTL. Doing so lets us schedule insns between
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5250