[Bug target/18932] [3.4/4.0 regression] ICE in copyprop_hardreg_forward_1, at regrename.c

["belyshev at lubercy dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From belyshev at lubercy dot com  2004-12-12 19:20 -------
testcase for 4.0.0, use "-O2" to reproduce:
----------------------------------------------------------------------------------------
char m[2];
char o[2];
short i[2];
int t[2];

void foo ()
{
  int c;
  
  for (c = 0; c < 2; c++)
    {
      if (i[c & 0xff] & 4)
	o[0] = 0;
      else if (i[c & 0xff] & 128)
	{
	  m[c] = t[c & 0xff];
	  o[c] = c;
	}
      
      if ((i[c & 0xff] & 136) || (i[c & 0xff] & 4))
	o[0] = 0;
    }
}
----------------------------------------------------------------------------------------
/usr/local/libexec/gcc/i686-pc-linux-gnu/4.0.0/cc1 -quiet tc-i386.c -O2
tc-i386.c: In function â??fooâ??:
tc-i386.c:25: error: insn does not satisfy its constraints:
(insn 166 96 98 5 (parallel [
            (set (reg:CCNO 17 flags)
                (compare:CCNO (and:QI (reg:QI 4 si [orig:107 D.1127 ] [107])
                        (const_int -120 [0xffffff88]))
                    (const_int 0 [0x0])))
            (set (reg:QI 4 si [orig:107 D.1127 ] [107])
                (and:QI (reg:QI 4 si [orig:107 D.1127 ] [107])
                    (const_int -120 [0xffffff88])))
        ]) 207 {*andqi_2} (nil)
    (expr_list:REG_UNUSED (reg:QI 4 si [orig:107 D.1127 ] [107])
        (nil)))
tc-i386.c:25: internal compiler error: in copyprop_hardreg_forward_1, at
regrename.c:1567


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|3.4.4                       |3.4.4 4.0.0
   Last reconfirmed|2004-12-10 21:06:02         |2004-12-12 19:20:28
               date|                            |
            Summary|[3.4 regression]  -         |[3.4/4.0 regression] ICE in
                   |march=pentium4 -O2 causes   |copyprop_hardreg_forward_1,
                   |ICE                         |at regrename.c


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18932