optimization/6025: linux m68k-elf-gcc segfault

[anders.blomdell@control.lth.se]

>Number:         6025
>Category:       optimization
>Synopsis:       linux m68k-elf-gcc cross compiler segfault
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Thu Mar 21 09:25:59 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Anders Blomdell <anders.blomdell@control.lth.se>
>Release:        3.0.4
>Organization:
Department of Automatic Control, LTH
>Environment:
System: Linux aljazari 2.4.13-KURT #2 Thu Nov 8 10:49:33 CET 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: m68k-unknown-elf
configured with: ../../../gcc-3.0.4/configure --prefix=/usr/local/packages/cross/m68k-elf --target=m68k-elf --with-newlib
>Description:
  gcc segfaults when the supplied program is compiled with 

    m68k-elf-gcc -v -save-temps -c -O3 segfault.c 

>How-To-Repeat:

######################## segfault.c #################################
    
static void Copy(int destination, int source)
{
  *(int*)destination = *(int*)source;
}

void SegFaultWhenCompiling(int i)
{
  for (;;) {
    switch (i) {
      case 0:;
        Copy(0x400000, 0x400000);
        break;
      case 1:;
        Copy(0x0, 0x0);
        break;
      case 2:;
        Copy(0x0, 0x0);
        break;
      case 4:;
        Copy(0x0, 0x0);
        break;
      case 3:;
        Copy(0xFFFF0000, 0xFFFF0000);
        break;
      default :
        Copy(0x400000, 0x01);
        break;
    }
  }
}

void f()
{
  SegFaultWhenCompiling(0);
}

######################## segfault.i #################################

# 5 "segfault.c"
static void Copy(int destination, int source)
{
  *(int*)destination = *(int*)source;
}

void SegFaultWhenCompiling(int i)
{
  for (;;) {
    switch (i) {
      case 0:;
        Copy(0x400000, 0x400000);
        break;
      case 1:;
        Copy(0x0, 0x0);
        break;
      case 2:;
        Copy(0x0, 0x0);
        break;
      case 4:;
        Copy(0x0, 0x0);
        break;
      case 3:;
        Copy(0xFFFF0000, 0xFFFF0000);
        break;
      default :
        Copy(0x400000, 0x01);
        break;
    }
  }
}

void f()
{
  SegFaultWhenCompiling(0);
}
# 5 "segfault.c"
static void Copy(int destination, int source)
{
  *(int*)destination = *(int*)source;
}

void SegFaultWhenCompiling(int i)
{
  for (;;) {
    switch (i) {
      case 0:;
        Copy(0x400000, 0x400000);
        break;
      case 1:;
        Copy(0x0, 0x0);
        break;
      case 2:;
        Copy(0x0, 0x0);
        break;
      case 4:;
        Copy(0x0, 0x0);
        break;
      case 3:;
        Copy(0xFFFF0000, 0xFFFF0000);
        break;
      default :
        Copy(0x400000, 0x01);
        break;
    }
  }
}

void f()
{
  SegFaultWhenCompiling(0);
}

######################## segfault.s #################################

        .file   "segfault.i"

######################## console output #################################

> m68k-elf-gcc -save-temps -c -O3 segfault.c  
segfault.c: In function `SegFaultWhenCompiling':
segfault.c:40: Internal error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.

>Fix:
	Lower -O level, code rearrangement
>Release-Note:
>Audit-Trail:
>Unformatted: