optimization/4298: ICE when compiling ISDN subsystem of LINUX kernel 2.4.9

[reichelt at igpm dot rwth-aachen dot de]

>Number:         4298
>Category:       optimization
>Synopsis:       ICE when compiling ISDN subsystem of LINUX kernel 2.4.9
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 11 04:16:02 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Volker Reichelt
>Release:        gcc 3.0, gcc 3.0.2 (prerelease, 20010903)
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
The compiler crashes when I try to compile "capi.c" of
the ISDN-subsystem of the kernel 2.4.9.

I reduced the problem to the attached code without touching
the assembler stuff. (I can provide the original
preprocessed file if requested.) Compiling the shortened
(with both -O2 and -fomit-frame-pointer) example I get:

bug.c: In function `capi_ioctl':
bug.c:47: Unrecognizable insn:
(insn/i 153 302 299 (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 [73])
                        (mem:SI (plus:SI (reg/f:SI 6 ebp)
                                (const_int -76 [0xffffffb4])) 0)
                        (reg:SI 0 eax [77])
                    ] 
                    [ 
                        (asm_input:SI ("1"))
                        (asm_input:SI ("g"))
                        (asm_input:SI ("g"))
                    ]  ("capi.c") 24))
            (set (reg/v:SI 1 edx [73])
                (asm_operands:SI ("addl %3,%1 ; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0") ("=r") 1[ 
                        (reg/v:SI 1 edx [73])
                        (mem:SI (plus:SI (reg/f:SI 6 ebp)
                                (const_int -76 [0xffffffb4])) 0)
                        (reg:SI 0 eax [77])
                    ] 
                    [ 
                        (asm_input:SI ("1"))
                        (asm_input:SI ("g"))
                        (asm_input:SI ("g"))
                    ]  ("capi.c") 24))
            (clobber (reg:QI 19 dirflag))
            (clobber (reg:QI 18 fpsr))
            (clobber (reg:QI 17 flags))
        ] ) -1 (insn_list 138 (insn_list 145 (nil)))
    (nil))
bug.c:47: Internal compiler error in reload_cse_simplify_operands, at reload1.c:8355
Please submit a full bug report, etc.

By the way, it's a regression versus 2.95.3.
>How-To-Repeat:
gcc -O2 -fomit-frame-pointer -c bug.c
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="bug.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="bug.c"
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