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From: Richard Zidlicky <rz@linux-m68k.org>
To: gcc-gnats@gcc.gnu.org
Subject: c/7872: ICE on legal code, regression from 3.0 and 2.9*
Date: Mon, 09 Sep 2002 14:36:00 -0000 [thread overview]
Message-ID: <200209092110.XAA05344@rz.de> (raw)
>Number: 7872
>Category: c
>Synopsis: ICE on legal code, regression from 3.0 and 2.9*
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Mon Sep 09 14:36:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Richard Zidlicky
>Release: 3.2
>Organization:
>Environment:
native and crosscompiled
target: m68k-unknown-linux-gnu
configured with: ../gcc-3.2/configure --enable-languages=c --disable-checking --with-newlib --without-headers --target=m68k-linux
>Description:
/data/rz/build-m68k-3.2-release/gcc/cc1 -O0 -m68020-60 x3.i
QMExecuteLoop
x3.i: In function `QMExecuteLoop':
x3.i:15: internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
rz@rz:/home/rz/test > /data/rz/build-m68k-3.2-release/gcc/cc1 -O1 -m68020-60 x3.i
QMExecuteLoop
>How-To-Repeat:
extern void (**table)(void);
typedef unsigned short uw16;
typedef unsigned int gshort;
void ExceptionProcessing(void);
short extraFlag;
register uw16 *pc asm("%a4");
register gshort code asm("%d6");
register int nInst asm("%d7");
void QMExecuteLoop(uw16 *oldPC)
{
table[code=(*(uw16*)(pc++))]();
}
>Fix:
The cause of the problem is that gen_lowpart() returns a (REG ...)
instead of a (SUBREG ...) in some obscure cases.
This patch fixes the problem:
--- gcc-3.2-cvs/gcc/simplify-rtx.c.rz Wed Mar 6 17:43:21 2002
+++ gcc-3.2-cvs/gcc/simplify-rtx.c Sat Aug 24 23:06:34 2002
@@ -2618,6 +2618,7 @@
suppress this simplification. If the hard register is the stack,
frame, or argument pointer, leave this as a SUBREG. */
+#if 0
if (REG_P (op)
&& (! REG_FUNCTION_VALUE_P (op)
|| ! rtx_equal_function_value_matters)
@@ -2662,6 +2663,7 @@
return x;
}
}
+#endif
/* If we have a SUBREG of a register that we are replacing and we are
replacing it with a MEM, make a new MEM and try replacing the
>Release-Note:
>Audit-Trail:
>Unformatted:
next reply other threads:[~2002-09-09 21:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-09 14:36 Richard Zidlicky [this message]
2002-12-14 12:56 Richard Zidlicky
2002-12-16 12:46 Wolfgang Bangerth
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