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Subject: [Bug rtl-optimization/55686] [4.8 Regression] ICE in assign_by_spills, at lra-assigns.c:1244
Date: Fri, 14 Dec 2012 10:03:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55686

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-12-14
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-14 10:02:52 UTC ---
Reduced testcase:

typedef unsigned long VALUE;
typedef unsigned long rb_num_t;
typedef struct rb_vm_struct {
    VALUE *pc;
    VALUE *sp;
} rb_control_frame_t;
void vm_expandarray(rb_control_frame_t *cfp, VALUE ary, rb_num_t num, int flag)
{
    VALUE *base = cfp->sp, *ptr;
    rb_num_t len;
    if (flag & 0x02) {
        rb_num_t i = 0, j;
        for (j=0; i<num; i++, j++) {
            VALUE v = ptr[len - j - 1];
            *base++ = v;
        }
    }
    register VALUE * reg_pc __asm__("e" "di");
    register rb_control_frame_t * reg_cfp __asm__("e" "si");
      { 
        rb_num_t flag = (rb_num_t)((reg_pc)[(2)]); 
        rb_num_t num = (rb_num_t)((reg_pc)[(1)]); 
        VALUE ary = (*(((((reg_cfp)->sp)))-(0)-1)); 
        ((reg_cfp->pc = reg_pc = (reg_pc + (1+2))));
        ((((reg_cfp)->sp) -= (((1)))));
        vm_expandarray((((reg_cfp))), ary, num, (int)flag);
        goto *(void const *)(*(reg_pc));
      }
}


> ./cc1 -quiet -O -m32 vm.3.3.i
vm.3.3.i: In function 'vm_expandarray':
vm.3.3.i:28:1: internal compiler error: in assign_by_spills, at
lra-assigns.c:1244
 }
 ^
0x95a80e assign_by_spills
        /space/rguenther/src/svn/trunk/gcc/lra-assigns.c:1244
0x95b133 lra_assign()
        /space/rguenther/src/svn/trunk/gcc/lra-assigns.c:1398
0x955893 lra(_IO_FILE*)
        /space/rguenther/src/svn/trunk/gcc/lra.c:2309
0x90ba42 do_reload
        /space/rguenther/src/svn/trunk/gcc/ira.c:4624
0x90bc50 rest_of_handle_reload
        /space/rguenther/src/svn/trunk/gcc/ira.c:4737