Re: optimization/8300: [3.2/3.3/3.4 regression] [sparc] ICE in gen_reg_rtx, at emit-rtl.c:662

[Robert Schiele <rschiele@uni-mannheim.de>]

The following reply was made to PR optimization/8300; it has been noted by GNATS.

From: Robert Schiele <rschiele@uni-mannheim.de>
To: rth@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   nobody@gcc.gnu.org, tneumann@pi3.informatik.uni-mannheim.de,
   gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: optimization/8300: [3.2/3.3/3.4 regression] [sparc] ICE in gen_reg_rtx, at emit-rtl.c:662
Date: Mon, 17 Mar 2003 06:08:21 +0100

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 On Sun, Mar 16, 2003 at 11:26:37PM -0000, rth@gcc.gnu.org wrote:
 > Synopsis: [3.2/3.3/3.4 regression] [sparc] ICE in gen_reg_rtx, at emit-rt=
 l.c:662
 >=20
 > State-Changed-From-To: analyzed->open
 > State-Changed-By: rth
 > State-Changed-When: Sun Mar 16 23:26:37 2003
 > State-Changed-Why:
 >     The code is illegal because *(&c+1) is not an object.
 
 Well, I can show that this is not the problem:
 
 Rewriting the code as
 
 void a() {
     double b;
     int c;
     c =3D *((int*)&b) && (*(&c + 1) =3D 0);
 }
 
 shows the same problem and as c is explicitly defined here _before_,
 *(&c + 1) is also well defined.
 
 And then we have two bugs here:
 
 1. My rewritten example is legal code with no doubt and produces an
    ICE whit optimization.
 
 2. The original sample is accepted is accepted without optimization,
    although you say, it is illegal.
 
 Robert
 
 --=20
 Robert Schiele			Tel.: +49-621-181-2517
 Dipl.-Wirtsch.informatiker	mailto:rschiele@uni-mannheim.de
 
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