[Bug bootstrap/32764] New: [4.3 regression] : Failed to bootstrap on Linux/ia64

["hjl at lucon dot org" <gcc-bugzilla at gcc dot gnu dot org>]

This checkin:

http://gcc.gnu.org/ml/gcc-cvs/2007-07/msg00486.html

causes

/net/gnu-13/export/gnu/src/gcc/gcc/libgcc/../gcc/libgcc2.c: In function
â__umodti3â:
/net/gnu-13/export/gnu/src/gcc/gcc/libgcc/../gcc/libgcc2.c:1137: internal
compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
make[5]: *** [_umoddi3.o] Error 1

var-tracking.c has

static rtx
find_src_set_src (dataflow_set *set, rtx loc, rtx insn)
{
  tree decl = NULL_TREE;   /* The variable being copied around.          */
  rtx src = NULL_RTX;      /* The location "decl" is being copied from.  */
  rtx set_src = NULL_RTX;  /* The value for "decl" stored in "src".      */
  void **slot;
  variable var;
  location_chain nextp;
  int i;
  bool found;

  if (GET_CODE (PATTERN (insn)) == SET)
    src = SET_SRC (PATTERN (insn));
  else if (GET_CODE (PATTERN (insn)) == PARALLEL
           || GET_CODE (PATTERN (insn)) == SEQUENCE)
    {
      for (i = XVECLEN (PATTERN (insn), 0) - 1; i >= 0; i--)
        if (GET_CODE (XVECEXP (PATTERN (insn), 0, i)) == SET
            && SET_DEST (XVECEXP (PATTERN (insn), 0, i)) == loc)
          src = SET_SRC (XVECEXP (PATTERN (insn), 0, i));
    }

  if (REG_P (src))
    decl = var_debug_decl (REG_EXPR (src));
  else if (MEM_P (src))
    decl = var_debug_decl (MEM_EXPR (src));

That can't be right since src can be NULL and "if (REG_P (src))" will
segfault. insn is

(gdb) call debug_rtx (insn)
(insn 535 895 533 50
/net/gnu-13/export/gnu/src/gcc/gcc/libgcc/../gcc/libgcc2.c:1056 (cond_exec (eq
(reg:BI 262 p6 [704])
            (const_int 0 [0x0]))
        (set (reg/v:DI 8 r8 [orig:386 m0.152 ] [386])
            (reg/v:DI 15 r15 [orig:455 m0 ] [455]))) 783
{sync_lock_releasedi+5} (nil))


-- 
           Summary: [4.3 regression] : Failed to bootstrap on Linux/ia64
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl at lucon dot org
GCC target triplet: ia64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32764