Re: optimization/7063: internal compiler error: Internal compiler error in failed_reload, at reload1.c:5047

[Reichelt <reichelt@igpm.rwth-aachen.de>]

The following reply was made to PR optimization/7063; it has been noted by GNATS.

From: Reichelt <reichelt@igpm.rwth-aachen.de>
To: gcc-gnats@gcc.gnu.org, spigel@olvs.miee.ru, gcc-bugs@gcc.gnu.org,
        nobody@gcc.gnu.org
Cc:  
Subject: Re: optimization/7063: internal compiler error: Internal compiler error in failed_reload, at reload1.c:5047
Date: Thu, 27 Jun 2002 14:35:10 +0200

 Hi,
 
 the bug can reproduced with the following code snippet:
 
 ------------------------snip here----------------------
 void foo()
 {
    char                      (*c)[2];
    float                     *fp;
    int                       i, j;
    union { float r; int i; } u;
 
    for ( i=0; i<j; ++i )
       if (j==1)
       {
          ++fp;
          u.r = *fp; c[i][0] = u.i>0 ? 0 : (u.r+=1, u.i);
          u.r = *fp; c[i][0] = u.i>0 ? 0 : (u.r+=1, u.i);
       }
 }
 ------------------------snip here----------------------
 
 Just compile it with "gcc -march=athlon -O2 -fforce-addr -c" to get
 the following error message:
 
 bug.c: In function `foo':
 bug.c:15: could not find a spill register
 (insn 50 48 51 (set (subreg:SF (reg:QI 67) 0)
         (plus:SF (subreg:SF (reg/v:SI 0 eax [62]) 0)
             (reg:SF 8 st(0) [69]))) 525 {*fop_sf_comm_nosse} (nil)
     (expr_list:REG_DEAD (reg/v:SI 0 eax [62])
         (nil)))
 bug.c:15: Internal compiler error in failed_reload, at reload1.c:5050
 Please submit a full bug report, [etc.]
 
 The bug is in gcc 3.1, recent snapshots of 3.1.1 and the main trunk.
 It's a regression from gcc 3.0.x.
 
 By the way, in the tar archive that was attached to the bug report
 there was another file (psout.i) that causes an athlon-related ICE.
 I opened another PR for that one (PR 7134).
 
 Greetings,
 Volker Reichelt
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7063
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7134