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Re: grokfield miscompiled with -O9

To: Alexandre Oliva <oliva at lsd dot ic dot unicamp dot br>
Subject: Re: grokfield miscompiled with -O9
From: Richard Henderson <rth at cygnus dot com>
Date: Mon, 10 Jan 2000 11:38:53 -0800
Cc: "Martin v. Loewis" <martin at loewis dot home dot cs dot tu-berlin dot de>, gcc-bugs at gcc dot gnu dot org, Jim Wilson <wilson at cygnus dot com>, "Jeffrey A. Law" <law at cygnus dot com>
References: <200001060411.XAA24509@onsager.chem.mcgill.ca> <orr9fup2ik.fsf@benta.lsd.ic.unicamp.br> <20000107102904.A1646@cygnus.com> <200001081846.TAA23474@loewis.home.cs.tu-berlin.de> <orzougtk7d.fsf@garnize.lsd.ic.unicamp.br> <20000108123157.B1786@cygnus.com> <orwvpi7eu4.fsf@garnize.lsd.ic.unicamp.br>

On Mon, Jan 10, 2000 at 02:03:47AM -0200, Alexandre Oliva wrote:
> How about skipping this simplification just while computing
> nonzero_bits?

This seems safe enough, though a case could be made for continuing
to discard paradoxical subregs.

> 	* combine.c (expand_field_assignment): Do not discard SUBREGs
> 	while computing nonzero_bits.

Ok.


r~

References:
- Re: ICE in optimized build of 20000103
  - From: David Ronis
- Re: ICE in optimized build of 20000103
  - From: Alexandre Oliva
- Re: ICE in optimized build of 20000103
  - From: Richard Henderson
- grokfield miscompiled with -O9
  - From: Martin v. Loewis
- Re: grokfield miscompiled with -O9
  - From: Alexandre Oliva
- Re: grokfield miscompiled with -O9
  - From: Richard Henderson
- Re: grokfield miscompiled with -O9
  - From: Alexandre Oliva

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