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Date: Tue, 01 Apr 2003 00:07:00 -0000
Message-ID: <20030401000725.8760.qmail@sources.redhat.com>
To: gabor@mac.com, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
  nobody@gcc.gnu.org
From: bangerth@dealii.org
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  gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: target/10282: [3.3/3.4 regression] ICE: unable to find a register to spill in class `Q_REGS'
X-SW-Source: 2003-04/txt/msg00000.txt.bz2
List-Id: <gcc-prs.sourceware.org>

Old Synopsis: ICE: unable to find a register to spill in class `Q_REGS'
New Synopsis: [3.3/3.4 regression] ICE: unable to find a register to spill in class `Q_REGS'

State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Tue Apr  1 00:07:24 2003
State-Changed-Why:
    Confirmed. This is as short as I could get it:
    ------------------------
    typedef struct X {
        char * p;
        long l;
    } X_t;
    
    void foo(X_t * A_buf , X_t * A_next) {
      int Li;
      long Ll;
      X_t Ld1;
      X_t Ld2;
    
      Li = undeclared1(Ll);
      Ld1 = *A_next;
      Ld2 = *A_buf;
      (*(Ld2.p + Ld1.l)) = Ll;
      undeclared2(Ld2);
    }
    -------------------------
    g/x> /home/bangerth/bin/gcc-3.4-pre/bin/gcc -O -c x.c
    x.c: In function `foo':
    x.c:17: error: unable to find a register to spill in class `Q_REGS'
    x.c:17: error: this is the insn:
    (insn 22 20 24 0 0x40153268 (set (mem:QI (plus:SI (subreg:SI (reg/v:DI 63 [ Ld2 ]) 0)
                    (subreg:SI (reg/v:DI 62 [ Ld1 ]) 4)) [0 S1 A8])
            (subreg:QI (reg/v:SI 4 esi [orig:61 Ll ] [61]) 0)) 48 {*movqi_1} (insn_list 18 (insn_list 20 (nil)))
        (expr_list:REG_DEAD (reg/v:SI 4 esi [orig:61 Ll ] [61])
            (expr_list:REG_DEAD (reg/v:DI 62 [ Ld1 ])
                (nil))))
    x.c:17: internal compiler error: in spill_failure, at reload1.c:1917
    Please submit a full bug report,
    with preprocessed source if appropriate.
    See <URL:http://gcc.gnu.org/bugs.html> for instructions.
    
    This is a regression on 3.3 and mainline w.r.t. 3.4.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10282