Re: c++/8993: ICE with -march=pentium4

[bangerth@dealii.org]

Old Synopsis: ICE during VTK compile
New Synopsis: ICE with -march=pentium4

State-Changed-From-To: feedback->closed
State-Changed-By: bangerth
State-Changed-When: Thu Dec 19 15:03:33 2002
State-Changed-Why:
    I got the source in private mail. After some deletions,
    the ICE can be triggered with this simple piece of code:
    ------------------------------
    void bar() {
      float *p, *q, f;
      if (*p)
        *q = 0;
      else
        *q = f;
    }
    --------------------------
    tmp/g> /home/bangerth/bin/gcc-3.2.2-pre/bin/c++ -c -march=pentium4 -O3 x.ii
    x.ii: In function `void bar()':
    x.ii:7: could not split insn
    (insn 53 63 64 (set (reg:SF 23 exmm2 [62])
            (if_then_else:SF (eq (mem:SF (reg/v/f:SI 0 eax [58]) [2 S4 A32])
                    (reg:SF 23 exmm2 [62]))
                (reg/v:SF 22 exmm1 [60])
                (const_double:SF 0 [0x0] 0 [0x0] 0 [0x0] 0 [0x0] 0 [0x0]))) 643 {*sse_movsfcc_const0_3} (insn_list 20 (nil))
        (expr_list:REG_DEAD (reg/v:SF 22 exmm1 [60])
            (nil)))
    x.ii:7: Internal compiler error in final_scan_insn, at final.c:2622
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
    
    It works on mainline, though. Since -march=pentium4 has
    not existed in any prior version, this is not a regression
    and I close it since it is apparently fixed in mainline.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8993