c/7695: i686/athlon specific ICE

[Bruno Haible <haible@ilog.fr>]

>Number:         7695
>Category:       c
>Synopsis:       i686/athlon specific ICE on simple arithmetic function
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 23 03:36:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Bruno Haible
>Release:        3.2
>Organization:
GNU hackers
>Environment:
System: Linux linuix 2.4.18-4GB #1 Wed Mar 27 13:57:05 UTC 2002 i686 unknown
Architecture: i686

        
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc-3.2/configure --prefix=/packages/gnu-inst-gcc/3.2 --enable-shared --enable-version-specific-runtime-libs --enable-nls --enable-threads=posix
>Description:

$ LC_ALL=C gcc -march=i686 -O2 -S j.c
j.c: In function `gbkext1_mbtowc':
j.c:28: unrecognizable insn:
(insn 163 161 165 (set (reg:QI 82)
        (const_int 128 [0x80])) -1 (nil)
    (nil))
j.c:28: Internal compiler error in extract_insn, at recog.c:2148
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
$ LC_ALL=C gcc -march=athlon -O2 -S j.c
j.c: In function `gbkext1_mbtowc':
j.c:28: unrecognizable insn:
(insn 161 159 163 (set (reg:QI 82)
        (const_int 128 [0x80])) -1 (nil)
    (nil))
j.c:28: Internal compiler error in extract_insn, at recog.c:2148
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

Without -march=i686 or -march=athlon there is no problem.

>How-To-Repeat:

See above. Here is j.c:

=============================== j.c ======================================
extern const unsigned short gbkext1_2uni_page81[6080];
int gbkext1_mbtowc (unsigned int *pwc, const unsigned char *s, int n)
{
  unsigned char c1 = s[0];
  if (c1 >= 0x81 && c1 <= 0xa0)
    {
      if (n >= 2)
        {
          unsigned char c2 = s[1];
          if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xff))
            {
              unsigned int i =
                190 * (c1 - 0x81) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
              unsigned short wc = 0xfffd;
              if (i < 6080)
                wc = gbkext1_2uni_page81[i];
              if (wc != 0xfffd)
                {
                  *pwc = (unsigned int) wc;
                  return 2;
                }
            }
          return -1;
        }
      return -2;
    }
  return -1;
}
==========================================================================

And here is a minimal j.c:

==========================================================================
int gbkext1_mbtowc (unsigned char c1, unsigned char c2)
{
  return c1 + (c2 - (c2 >= 0x80 ? 0x41 : 0x40));
}
==========================================================================

>Fix:

unknown
>Release-Note:
>Audit-Trail:
>Unformatted: