Another ICE with egcs-current...

["Matthias Urlichs" <smurf at noris dot de>]

The following code
###################
extern __inline__ int test_and_set_bit(int nr, volatile void * addr)
{
	int oldbit;
	__asm__ __volatile__( "" 
		"btsl %2,%1\n\tsbbl %0,%0"
		:"=r" (oldbit),"=m" (addr)
		:"ir" (nr));
	return oldbit;
}
struct buffer_head {
	unsigned long b_state;		 
};
extern void lock_buffer(struct buffer_head * bh)
{
	while (test_and_set_bit(2 , &bh->b_state))
		__wait_on_buffer(bh);
}

###################
generates this error
###################
gx.c: In function `lock_buffer':
gx.c:17: internal error--unrecognizable insn:
(insn 52 63 54 (parallel[ 
            (set (reg/v:SI 26)
                (asm_operands/v ("btsl %2,%1
	sbbl %0,%0") ("=r") 0[ 
                        (const_int 2)
                    ] 
                    [ 
                        (asm_input:SI ("ir"))
                    ]  ("gx.c") 7))
            (set (mem:SI (reg:SI 29))
                (asm_operands/v ("btsl %2,%1
	sbbl %0,%0") ("=m") 1[ 
                        (const_int 2)
                    ] 
                    [ 
                        (asm_input:SI ("ir"))
                    ]  ("gx.c") 7))
        ] ) -1 (insn_list 63 (nil))
    (expr_list:REG_DEAD (reg:SI 29)
        (nil)))
toplev.c:1191: Internal compiler error in function fatal_insn
###################
when compiled with this command
###################
gcc -v -O2 gx.c
###################
Reading specs from /usr/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.47/specs
gcc version egcs-2.91.47 19980707 (gcc2 ss-980609 experimental)
 /usr/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.47/cpp -lang-c -v -undef -D__GNUC__=2 -D__GNUC_MINOR__=91 -D__ELF__ -Dunix -Dlinux -D__ELF__ -D__unix__ -D__linux__ -D__unix -D__linux -Asystem(posix) -D__OPTIMIZE__ -Di386 -Asystem(unix) -Acpu(i386) -Amachine(i386) -D__pentium__ -D__i586__ -D__i386__ -Asystem(unix) -Acpu(i386) -Amachine(i386) -D__pentium__ -D__i586__ gx.c /tmp/cc6KZ3PY.i
GNU CPP version egcs-2.91.47 19980707 (gcc2 ss-980609 experimental) (i386 Linux/ELF)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/i586-pc-linux-gnu/include
 /usr/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.47/include
 /usr/include
End of search list.
 /usr/lib/gcc-lib/i586-pc-linux-gnu/egcs-2.91.47/cc1 /tmp/cc6KZ3PY.i -quiet -dumpbase gx.c -O2 -version -o /tmp/cccDDIGO.s
GNU C version egcs-2.91.47 19980707 (gcc2 ss-980609 experimental) (i586-pc-linux-gnu) compiled by GNU C version egcs-2.91.45 19980701 (gcc2 ss-980609 experimental).
gx.c: In function `lock_buffer':
gx.c:17: internal error--unrecognizable insn:
(insn 52 63 54 (parallel[ 
            (set (reg/v:SI 26)
                (asm_operands/v ("btsl %2,%1
	sbbl %0,%0") ("=r") 0[ 
                        (const_int 2)
                    ] 
                    [ 
                        (asm_input:SI ("ir"))
                    ]  ("gx.c") 7))
            (set (mem:SI (reg:SI 29))
                (asm_operands/v ("btsl %2,%1
	sbbl %0,%0") ("=m") 1[ 
                        (const_int 2)
                    ] 
                    [ 
                        (asm_input:SI ("ir"))
                    ]  ("gx.c") 7))
        ] ) -1 (insn_list 63 (nil))
    (expr_list:REG_DEAD (reg:SI 29)
        (nil)))
toplev.c:1191: Internal compiler error in function fatal_insn
###################

Replacing "ir" with "i" generates an "inconsistent asm constraints" error
(why?), while "r" does not change the error from above.
-- 
Matthias Urlichs
noris network GmbH