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From: jason@gcc.gnu.org
To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	khindenburg@cherrynebula.net, nobody@gcc.gnu.org
Subject: Re: optimization/9123: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434
Date: Mon, 10 Mar 2003 22:37:00 -0000	[thread overview]
Message-ID: <20030310223743.28280.qmail@sources.redhat.com> (raw)

Synopsis: [3.2/3.3/3.4 regression ] Internal compiler error in do_SUBST at combine.c:434

State-Changed-From-To: analyzed->open
State-Changed-By: jason
State-Changed-When: Mon Mar 10 22:37:43 2003
State-Changed-Why:
    Not a c++-specific bug; it's dying because it's trying to substitute (unsigned char)-1 for a QI reg, but combine doesn't like that because (HOST_WIDE_INT)255 != (HOST_WIDE_INT)-1.  Here's a C testcase:
    
    typedef unsigned char T;
    inline T clamp (T in, T min, T max)
    {
      return in <= min ? min : in >= max ? max : in;
    }
    unsigned char f (int i)
    {
      return clamp (i, 0, 255);
    }

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9123


             reply	other threads:[~2003-03-10 22:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-10 22:37 jason [this message]
2003-03-10 22:38 jason
2003-03-22 21:46 Janis Johnson
2003-03-28 10:39 Eric Botcazou
2003-03-28 17:16 Jason Merrill
2003-03-28 20:36 Eric Botcazou
2003-03-28 22:06 ebotcazou

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