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Date: Fri, 26 Jul 2002 15:52:00 -0000
From: Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
To: Richard Henderson <rth@redhat.com>
Cc: Peter.Barada@motorola.com, gcc@gcc.gnu.org
Subject: Re: ICE building glibc-2.2.5 using m68k-linux gcc-3.1
Message-ID: <20020726135349.A1114@linux-m68k.org>
References: <200207222009.g6MK9xI27711@hyper.wm.sps.mot.com> <20020725172702.B1938@linux-m68k.org> <200207251933.g6PJXKp06132@hyper.wm.sps.mot.com> <20020725180431.A27259@redhat.com>
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In-Reply-To: <20020725180431.A27259@redhat.com>; from rth@redhat.com on Thu, Jul 25, 2002 at 06:04:31PM -0700
X-SW-Source: 2002-07/txt/msg01276.txt.bz2

On Thu, Jul 25, 2002 at 06:04:31PM -0700, Richard Henderson wrote:
> On Thu, Jul 25, 2002 at 03:33:20PM -0400, Peter Barada wrote:
> > (gdb) call debug_rtx(set)
> > 
> > (set (strict_low_part (reg:HI 6 %d6))
> >     (reg:HI 30))
> 
> This is wrong.  The argument to STRICT_LOW_PART must always be
> a SUBREG of a REG.

so the responsible pattern seems to be

(define_expand "zero_extendhisi2"
  [(set (match_operand:SI 0 "register_operand" "")
	(const_int 0))
   (set (strict_low_part (match_dup 2))
	(match_operand:HI 1 "general_operand" ""))]
  ""
  "
{
  operands[1] = make_safe_from (operands[1], operands[0]);
  operands[2] = gen_lowpart (HImode, operands[0]);
}")

Funny enough, the m68k version of zero_extendhisi2 insn pattern 
is part of the gcc internals docs for 3.x and it is written
differently there, with an (subreg:HI ...) so I am trying this
variant now - anyone remembers when or why it was changed?

Richard