[Bug rtl-optimization/21299] [4.0/4.1/4.2 Regression] internal error on invalid asm statement

["tbm at cyrius dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from tbm at cyrius dot com  2006-07-27 17:16 -------
(In reply to comment #2)
> This is not i386 specific.  I get the same on ia64 with e.g.
> 
> void f(int port)
> {
>     __asm__ volatile ("inb %1,%0"
>         :"=a" (port)
>         :"d"((unsigned short) port));
> }

Just for the record, here's the output:

tbm@coconut0:~/src/svgalib-1.4.3$ /usr/lib/gcc-snapshot/bin/gcc -c -O2 x.c
x.c: In function 'f':
x.c:3: error: impossible register constraint in 'asm'
x.c:3: error: impossible register constraint in 'asm'
x.c:3: error: impossible register constraint in 'asm'
x.c:6: error: unrecognizable insn:
(insn 11 7 23 2 (set (reg:SI 2 r2)
        (asm_operands/v:SI ("inb %1,%0") ("=a") 0 [
                (reg:HI 112 in0)
            ]
             [
                (asm_input:HI ("d"))
            ] ("x.c") 3)) -1 (nil)
    (nil))
x.c:6: internal compiler error: in reload_cse_simplify_operands, at
postreload.c:393
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21299