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Re: c/4529 (150 lines testcase)
- To: gcc-gnats at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, ltuikov at yahoo dot com,gcc-bugs at gcc dot gnu dot org, nobody at gcc dot gnu dot org
- Subject: Re: c/4529 (150 lines testcase)
- From: Ralf Berger <gotan at gmx dot net>
- Date: Fri, 12 Oct 2001 21:50:39 +0200
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=4529&database=gcc
Hi, i had the same Problem with the gcc3.0.1 (rpm from Mandrake:
gcc3.0-3.0.1-1mdk) also
when compiling the 8139too module. I cut the preprocessed file to a
testcase of 150 lines
(containing no includes). The file compiled with -O1 (as opposed to -O2)
or when ommitting
-fomit-frame-pointer. The original 8139too.c module also compiled with
-O3, i believe the
compiler was then able to cut out the critical branch (i removed some
if-branches which apparently
had nothing to do with the error in the testcase). I think the error has
something to do with
inlining.
A compile with
gcc -I/usr/src/linux-2.4.10-ac12/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fomit-frame-pointer -v -c -o 8139too3.o 8139too3.c
results in:
$ make
gcc -I/usr/src/linux-2.4.10-ac12/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fomit-frame-pointer -v -c -o 8139too3.o 8139too3.c
Reading specs from /usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
--infodir=/usr/share/info --enable-shared --enable-threads=posix
--disable-checking --enable-long-long --enable-cstdio=stdio
--enable-clocale=generic --enable-languages=c,c++,f77,objc,java
--program-suffix=-3.0.1 --enable-objc-gc --host=i586-mandrake-linux-gnu
Thread model: posix
gcc version 3.0.1
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/cc1 -lang-c -v
-I/usr/src/linux-2.4.10-ac12/include -D__GNUC__=3 -D__GNUC_MINOR__=0
-D__GNUC_PATCHLEVEL__=1 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__
-D__linux__ -D__unix -D__linux -Asystem=posix -D__OPTIMIZE__
-D__STDC_HOSTED__=1 -Wall -Wstrict-prototypes -Wno-trigraphs -Acpu=i386
-Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i586__
-D__tune_pentium__ 8139too3.c -quiet -dumpbase 8139too3.c -O2 -Wall
-Wstrict-prototypes -Wno-trigraphs -version -fomit-frame-pointer -o
/home/ralf/tmp/ccQ5Q1vf.s
GNU CPP version 3.0.1 (cpplib) (i386 Linux/ELF)
GNU C version 3.0.1 (i586-mandrake-linux-gnu)
compiled by GNU C version 3.0.1.
ignoring nonexistent directory "/usr/i586-mandrake-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/src/linux-2.4.10-ac12/include
/usr/local/include
/usr/lib/gcc-lib/i586-mandrake-linux-gnu/3.0.1/include
/usr/include
End of search list.
8139too3.c: In function `netdev_ethtool_ioctl':
8139too3.c:151: Unrecognizable insn:
(insn/i 219 450 447 (parallel[
(set (reg:SI 6 ebp)
(asm_operands:SI ("addl %3,%1; sbbl %0,%0; cmpl %1,%4;
sbbl $0,%0") ("=&r") 0[
(reg/v:SI 1 edx [101])
(mem:SI (plus:SI (reg/f:SI 6 ebp)
(const_int -156 [0xffffff64])) 0)
(mem/s:SI (reg/f:SI 0 eax [104]) 3)
]
[
(asm_input:SI ("1"))
(asm_input:SI ("g"))
(asm_input:SI ("g"))
] ("8139too3.c") 76))
(set (reg/v:SI 1 edx [101])
(asm_operands:SI ("addl %3,%1; sbbl %0,%0; cmpl %1,%4;
sbbl $0,%0") ("=r") 1[
(reg/v:SI 1 edx [101])
(mem:SI (plus:SI (reg/f:SI 6 ebp)
(const_int -156 [0xffffff64])) 0)
(mem/s:SI (reg/f:SI 0 eax [104]) 3)
]
[
(asm_input:SI ("1"))
(asm_input:SI ("g"))
(asm_input:SI ("g"))
] ("8139too3.c") 76))
(clobber (reg:QI 19 dirflag))
(clobber (reg:QI 18 fpsr))
(clobber (reg:QI 17 flags))
] ) -1 (insn_list 214 (insn_list 218 (nil)))
(nil))
8139too3.c:151: Internal compiler error in reload_cse_simplify_operands,
at reload1.c:8355
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:https://qa.mandrakesoft.com/> for instructions.
make: *** [8139too3.o] Fehler 1
typedef unsigned int size_t;
typedef unsigned int u32;
void memset_generic(void *, char, unsigned long);
static inline char * strcpy(char * dest,const char *src)
{
int d0, d1, d2;
__asm__ __volatile__(
"1:\tlodsb\n\tstosb\n\ttestb %%al,%%al\n\tjne 1b"
: "=&S" (d0), "=&D" (d1), "=&a" (d2)
:"0" (src),"1" (dest)
: "memory"
);
return dest;
}
struct task_struct {
unsigned long seg;
};
extern struct task_struct * foo_task_struct;
struct ethtool_cmd {
u32 cmd;
};
struct ethtool_drvinfo {
u32 cmd;
char driver[32];
};
struct ethtool_wolinfo {
u32 cmd;
};
int foo(void *to, const void *from, unsigned long);
static inline unsigned long
__constant_copy_to_user(void *to, const void *from, unsigned long n)
{
if (
({
unsigned long flag,sum;
asm(
"addl %3,%1; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0"
:"=&r" (flag), "=r" (sum)
:"1" (to),"g" ((int)(n)),"g" (foo_task_struct->seg));
flag;
}) == 0 )
{
int __d0, __d1;
__asm__ __volatile__(
"0: rep; movsl\n"
"1:\n"
".section .fixup,\"ax\"\n"
"2: shl $2,%0\njmp 1b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,2b\n"
".previous"
: "=c"(n), "=&S" (__d0), "=&D" (__d1)
: "1"(from), "2"(to), "0"(n/4)
: "memory"
);
}
return n;
}
static inline unsigned long
__constant_copy_from_user(void *to, const void *from, unsigned long n)
{
if (
({
unsigned long flag,sum;
asm("addl %3,%1; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0"
:"=&r" (flag), "=r" (sum)
:"1" (from),"g" ((int)(n)),"g" (foo_task_struct->seg));
flag;
}) == 0
)
do {
int __d0, __d1;
__asm__ __volatile__(
"0: rep; movsl\n"
"1:\n"
".section .fixup,\"ax\"\n"
"2: pushl %0\n"
" pushl %%eax\n"
" xorl %%eax,%%eax\n"
" rep; "
" stosl\n"
" popl %%eax\n"
" popl %0\n"
" shl $2,%0\n"
" jmp 1b\n"
".previous\n"
".section __ex_table,\"a\"\n"
" .align 4\n"
" .long 0b,2b\n"
".previous"
: "=c"(n), "=&S" (__d0), "=&D" (__d1)
: "1"(from), "2"(to), "0"(n/4)
: "memory");
}
while (0);
else
memset_generic(to,0,n);
return n;
}
void netdev_get_eset (struct ethtool_cmd *eset);
int netdev_ethtool_ioctl (void *useraddr, u32 ethcmd)
{
switch (ethcmd) {
case 0x00000001:
{
struct ethtool_cmd eset = { 0x00000001 };
netdev_get_eset (&eset);
if (__constant_copy_to_user(useraddr,&eset,sizeof (eset)) )
return -14;
return 0;
}
case 0x00000003:
{
struct ethtool_drvinfo info = { 0x00000003 };
strcpy (info.driver, "8139too");
if (__constant_copy_to_user(useraddr,&info,sizeof (info)) )
return -14;
return 0;
}
case 0x00000005:
{
struct ethtool_wolinfo wol = { 0x00000005 };
if (__constant_copy_to_user(useraddr,&wol,sizeof (wol)) )
return -14;
return 0;
}
case 0x00000006:
{
struct ethtool_wolinfo wol;
if (__constant_copy_from_user(&wol,useraddr,sizeof (wol)) )
return -14;
return 0;
}
default:
break;
}
return -95;
}