c++/6056: ICE on legal code with when optimizations higher that -O (ia64 only)

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* c++/6056: ICE on legal code with when optimizations higher that -O (ia64 only)
@ 2002-03-26  1:26 djohnson
  0 siblings, 0 replies; 2+ messages in thread
From: djohnson @ 2002-03-26  1:26 UTC (permalink / raw)
  To: gcc-gnats


>Number:         6056
>Category:       c++
>Synopsis:       ICE on legal code with when optimizations higher that -O (ia64 only)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 26 01:26:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     The Ohio Supercomputer Center
>Release:        gcc version 3.1 20020318 (prerelease)
>Organization:
>Environment:
System: Linux ia64 2.4.17 #8 SMP Thu Feb 7 09:52:30 EST 2002 ia64 unknown
Architecture: ia64

host: ia64-unknown-linux-gnu
build: ia64-unknown-linux-gnu
target: ia64-unknown-linux-gnu
configured with: ../configure --prefix=/opt/gcc-pre3.1 --disable-java --enable-threads=posix --enable-parallel-mark

>Description:
When compiling the attached routine with any level of optimization above -O, an internal compiler error will be triggered. The preprocessed code is attached. This does not happen on ia32 but does on ia64.

[ia64]% g++ -O2 -c bug.cpp
gnubug.cpp: In static member function `static ULong_t TMath::Hash(const void*, 
   int)':
gnubug.cpp:95: Internal compiler error in verify_local_live_at_start, at flow.c
   :590


>How-To-Repeat:
Only on ia64.
>Fix:
Lower the optimization level.
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="bug.cpp"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="bug.cpp"

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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: c++/6056: ICE on legal code with when optimizations higher that -O (ia64 only)
@ 2002-03-26 10:18 jakub
  0 siblings, 0 replies; 2+ messages in thread
From: jakub @ 2002-03-26 10:18 UTC (permalink / raw)
  To: djohnson, gcc-bugs, gcc-prs, nobody

Synopsis: ICE on legal code with when optimizations higher that -O (ia64 only)

State-Changed-From-To: open->analyzed
State-Changed-By: jakub
State-Changed-When: Tue Mar 26 10:18:49 2002
State-Changed-Why:
    It is actually code with undefined behaviour (because
    it does invalid type punning), but no matter what
    gcc probably shouldn't ICE on it.
    Simplified into:
    extern unsigned long d[];
    unsigned long foo (unsigned char *x, int y)
    {
      unsigned long a = 0, c = 0;
      unsigned short *e = (unsigned short *) &a;
      int i, b;
    
      for (i = 0; i < y; i++)
        c = (c << 1) ^ d[i & 3];
      if (i & 3) a ^= c;
    
      a *= 1879048201;
      e[0] += e[1];
      return a;
    }
    at -O2.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6056


^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2002-03-26 18:18 UTC | newest]

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2002-03-26  1:26 c++/6056: ICE on legal code with when optimizations higher that -O (ia64 only) djohnson
2002-03-26 10:18 jakub

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