[Bug target/55277] New: [4.6/4.7/4.8 regression] ICE in assign_by_spills, at lra-assigns.c:1217

["steven at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55277

             Bug #: 55277
           Summary: [4.6/4.7/4.8 regression] ICE in assign_by_spills, at
                    lra-assigns.c:1217
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Keywords: ra
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: steven@gcc.gnu.org
                CC: debian-gcc@lists.debian.org, gcc-bugs@gcc.gnu.org,
                    jakub@gcc.gnu.org, law@gcc.gnu.org, law@redhat.com,
                    vmakarov@gcc.gnu.org, vmakarov@redhat.com
        Depends on: 42536
            Target: i486-linux-gnu


+++ This bug was initially created as a clone of Bug #42536 +++

Cloned for LRA.

/* { dg-do compile { target { { i?86-*-* x86_64-*-* } && ilp32 } } } */
/* { dg-options "-O2 -fno-gcse -fno-omit-frame-pointer -m32" } */

struct C;
struct B { struct C *b; };
struct C { void (*baz) (struct B *, void *, int); };
typedef union { int f; void *e; } D;
struct E { struct B *e; };
struct A { struct E *a1; D *a2; D *a3; };

void
foo (long *x, long y)
{
  *(long long *) x = y;
}

extern long fn1 (D);
extern void fn2 (void);

void
_bar (struct A *x)
{
  register int a asm ("esi");
  register D *volatile b asm ("edi");
  register int c asm ("ebx");
  void *d;
  asm volatile ("" : "=r" (a), "=r" (b), "=r" (c) : : "memory");
  if ((d = b[-2].e) != 0 && b [-2].e < d)
    {
      foo (&(((long *) d) + 1) [b[0].f], fn1 (b[-1]));
      x->a2 = (D *) c;
      x->a3 = b;
      fn2 ();
    }
  x->a1->e->b->baz (x->a1->e, (void *) (long) a, 1);
}


At trunk r193411:

t.c: In function '_bar':
t.c:36:1: internal compiler error: in assign_by_spills, at lra-assigns.c:1217
 }
 ^
0x8d6d6f assign_by_spills
        ../../trunk/gcc/lra-assigns.c:1217
0x8d7ab5 lra_assign()
        ../../trunk/gcc/lra-assigns.c:1369
0x8d2942 lra(_IO_FILE*)
        ../../trunk/gcc/lra.c:2303
0x882ea0 do_reload
        ../../trunk/gcc/ira.c:4624
0x883089 rest_of_handle_reload
        ../../trunk/gcc/ira.c:4737
Please submit a full bug report,
with preprocessed source if appropriate.