On Fri, 15 Jan 1999, Daniel Jacobowitz wrote:
> I suspect that alloca itself is not at fault. Anyway....
well, maybe you are right, but I found out that it is part of the problem.
Removing it removed the bug. And as you can see I have chopped off 99% of
the code. I could not remove anything more, because whatever I did fixed
the bug.
> Notice on the third line of the insn dump, the (const_int 65536). I am
> fairly sure that that is the invalid part.
You are probably right about that, because it appeared in every failed
compile -and not all were exactly the same.
> Look up in the info pages the various options for the optimizer. Try
> things like -O2 -fno-gcse and -O2 -fno-schedule-insns2. See which one
> makes it go away, if any do. Then try -O -fschedule-insns2, etc.
Here's the output with -O2 :
gcc -DHAVE_CONFIG_H -I. -I. -I. -DG_LOG_DOMAIN=g_log_domain_glib -O2 \
-Wall -D_REENTRANT -c testglib.c
testglib.c: In function `main':
testglib.c:9: warning: unused variable `mem'
testglib.c:48: warning: `dirname' might be used uninitialized in this
function
testglib.c:61: internal error--unrecognizable insn:
(insn 393 390 389 (set (reg:DI 14 r14)
(mem:DI (plus:SI (reg:SI 14 r14)
(const_int 65536)))) -1 (insn_list 74 (insn_list 72
(insn_list 390 (insn_list:REG_DEP_ANTI 73 (insn_list:REG_DEP_ANTI 385
(nil))))))
(nil))
../../gcc/toplev.c:1378: Internal compiler error in function fatal_insn
now the same but -O2 -fno-schedule-insns2
gcc -DHAVE_CONFIG_H -I. -I. -I. -DG_LOG_DOMAIN=g_log_domain_glib -O2 \
-fno-schedule-insns2 -Wall -D_REENTRANT -c testglib.c
testglib.c: In function `main':
testglib.c:9: warning: unused variable `mem'
testglib.c:48: warning: `dirname' might be used uninitialized in this
function
testglib.c:61: internal error--unrecognizable insn:
(insn 393 390 389 (set (reg:DI 14 r14)
(mem:DI (plus:SI (reg:SI 14 r14)
(const_int 65536)))) -1 (nil)
(nil))
../../gcc/toplev.c:1378: Internal compiler error in function fatal_insn
compiling with -O -fschedule-insns2 seemed to solve it.
> Try eliminating as much as you can of that file, starting with the
> other functions, and recompiling it each time to see if the error goes
> away. Get it as small as you can without eliminating the error,
> preferably under a hundred lines.
how's 62 lines? :) look at the attachment. Well, I must say, that I can
not proceed further from here, because I would need to get dirty with
assembly code and I am no expert in ppc, assembly (I did some z80 assembly
back in spectrum days, but today it's a whole lot different).
Konstantinos Margaritis
[EMAIL PROTECTED]
#include "glib.h"
int
main (int argc,
char *argv[])
{
gchar *string;
gchar *mem[10000];
gint i;
struct {
gchar *filename;
gchar *dirname;
} dirname_checks[] = {
#ifndef NATIVE_WIN32
{ "/", "/" },
{ "////", "/" },
{ ".////", "." },
{ ".", "." },
{ "..", "." },
{ "../", ".." },
{ "..////", ".." },
{ "", "." },
{ "a/b", "a" },
{ "a/b/", "a/b" },
{ "c///", "c" },
#else
{ "\\", "\\" },
{ ".\\\\\\\\", "." },
{ ".", "." },
{ "..", "." },
{ "..\\", ".." },
{ "..\\\\\\\\", ".." },
{ "", "." },
{ "a\\b", "a" },
{ "a\\b\\", "a\\b" },
{ "c\\\\\\", "c" },
#endif
};
guint n_dirname_checks = sizeof (dirname_checks) / sizeof (dirname_checks[0]);
#ifdef G_HAVE_GINT64
guint64 gu64t1 = G_GINT64_CONSTANT(0x1d636b02300a7aa7U),
gu64t2 = G_GINT64_CONSTANT(0xa77a0a30026b631dU);
#endif
for (i = 0; i < n_dirname_checks; i++)
{
gchar *dirname;
g_free (dirname);
}
#ifdef G_HAVE_GINT64
g_assert (GUINT64_SWAP_LE_BE (gu64t1) == gu64t2);
#endif
#ifdef G_HAVE_ALLOCA
string = g_alloca(80);
#endif
return 0;
}
