c/5753: gcc-3.0.4 w/target of m68k-elf gets ICE

[pbarada@mail.wm.sps.mot.com]

>Number:         5753
>Category:       c
>Synopsis:       gcc-3.0.4 w/target of m68k-elf gets ICE
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Feb 22 13:56:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Peter Barada
>Release:        3.0.4
>Organization:
>Environment:
System: Linux hyper.wm.sps.mot.com 2.4.2-2 #1 Sun Apr 8 20:41:30 EDT 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: m68k-unknown-elf
configured with: /home/pbarada/work/cvs-wavemark/cross-linux-tools/gcc-3.0.4/configure --target=m68k-elf --prefix=/usr/local/wave/cross-test-304 --enable-languages=c,c++ --with-local-prefix=/usr/local/wave/cross-test-304/m68k-elf --with-newlib
>Description:
gcc-3.0.4 conifigured for m68k-elf generates an ICE when run with
-m5200.  This is cause by reload choosing an address register when the
load is QImode from memory.  The 5200 doesn't support loading a QImode
into an address register:

/usr/local/wave/cross-test-304/bin/m68k-elf-gcc -fno-exceptions -S -gstabs -malign-int -Wall -Wno-format -m5200 /tmp/cfprintf4.c -o /tmp/cfprintf4.s -da
/tmp/cfprintf4.c: In function `_vformat':
/tmp/cfprintf4.c:58: Insn does not satisfy its constraints:

(insn 258 38 185 (set (reg:QI 8 %a0)
        (mem/f:QI (plus:SI (reg/f:SI 14 %a6)
                (const_int -1 [0xffffffff])) 0)) 37 {*m68k.md:1060} (nil)
    (nil))
/tmp/cfprintf4.c:58: Internal compiler error in final_scan_insn, at final.c:2876

>From the cfprintf4.c.20.greg file:

Reloads for insn # 185
Reload 0: reload_out (SI) = (reg:SI 68)
	ADDR_REGS, RELOAD_FOR_OUTPUT (opnum = 0)
	reload_out_reg: (reg:SI 68)
	reload_reg_rtx: (reg:SI 8 %a0)
Reload 1: reload_in (QI) = (mem/f:QI (plus:SI (reg/f:SI 14 %a6)
                                                        (const_int -1 [0xffffffff])) 0)
	ADDR_REGS, RELOAD_FOR_INPUT (opnum = 1)
	reload_in_reg: (mem/f:QI (plus:SI (reg/f:SI 14 %a6)
                                                        (const_int -1 [0xffffffff])) 0)
	reload_reg_rtx: (reg:QI 8 %a0)

note the reload choice for QImode...

It compiles w/o ICE(I don't have any idea if code is correct) for
m6800, m68020, m68030, m68040, m68060. 

>How-To-Repeat:

typedef __builtin_va_list va_list;
extern char *_fmtcvt(unsigned int value, int base, char *cp);
extern int strlen(const char *s);
void _vformat (void (*putsub)(char c, char **p),
              char **putbuf, const char *fmt, va_list argp)
{
  char c;
  int i;
  char *cp;
  char s[512];

  cp = s+14;

  for (;;) {
    c = *fmt++;
    if (!c) {
      break;
    }

    s[14] = 0;

    switch (c) {
    case 'o':
      cp = _fmtcvt((unsigned int)(__builtin_va_arg(argp, unsigned int)),
                   8, s+14);
      i = (s+14) - cp;
      break;

    case 'u':
      cp = _fmtcvt((unsigned int)(__builtin_va_arg(argp, unsigned int)),
                   10, s+14);
      i = (s+14) - cp;
      break;

    case 'd':
      cp = _fmtcvt((unsigned int)(__builtin_va_arg(argp, int)), -10, s+14);
      i = (s+14) - cp;
      break;

    case 'p':
      cp = _fmtcvt((unsigned int)(__builtin_va_arg(argp, void*)), 16, s+14);
      i = (s+14) - cp;
      break;

    case 's':
      i = strlen(cp = __builtin_va_arg(argp, char *));
      break;

    default:
      cp = s;
      s[0] = c;
      s[i = 1] = 0;
    }
    if (i == 0) {
      continue;
    }
  }
}

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