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Re: [patch] PR 32283

From: Paolo Bonzini <bonzini at gnu dot org>
To: Zdenek Dvorak <rakdver at kam dot mff dot cuni dot cz>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 17 Nov 2008 18:38:24 +0100
Subject: Re: [patch] PR 32283
References: <20081117034139.GA7953@kam.mff.cuni.cz> <49216D4A.5050908@gnu.org> <20081117165845.GA8587@kam.mff.cuni.cz>

> this transformation is different from the one needed (this piece of
> code is turning ((x << 2) - 4) & ~3 to (x << 2) - 4).

Oops, yes, the transformation I had in mind is still done (by
force_to_mode and simplify_and_const_int) in combine.c only.

> However,
> implementing the required transformation using nonzero_bits would
> indeed be a better idea,

Good, thanks.

Paolo

Follow-Ups:
- Re: [patch] PR 32283
  - From: Zdenek Dvorak

References:
- [patch] PR 32283
  - From: Zdenek Dvorak
- Re: [patch] PR 32283
  - From: Paolo Bonzini
- Re: [patch] PR 32283
  - From: Zdenek Dvorak

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