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Re: [PATCH] BIT_FIELD_REF on VECTOR_CST

From: Richard Henderson <rth at redhat dot com>
To: Roger Sayle <roger at eyesopen dot com>
Cc: Jakub Jelinek <jakub at redhat dot com>, gcc-patches at gcc dot gnu dot org
Date: Tue, 31 May 2005 11:11:19 -0700
Subject: Re: [PATCH] BIT_FIELD_REF on VECTOR_CST
References: <20050530192005.GD22349@devserv.devel.redhat.com> <Pine.LNX.4.44.0505301417290.12594-100000@www.eyesopen.com>

On Mon, May 30, 2005 at 02:22:49PM -0600, Roger Sayle wrote:
> In fact, it should be possible to improve on your
> patch and lower a BIT_FIELD_REF of a VECTOR_CST to a BIT_FIELD_REF
> of a REAL_CST or INTEGER_CST even if the offset and length aren't
> perfectly aligned.

I'm not sure that's worthwhile.  Better might be to go ahead
and add VECTOR_ELT_{INS,EXT} codes to insert and extract the
various elements, rather than overloading BIT_FIELD_REF.

r~

References:
- [PATCH] BIT_FIELD_REF on VECTOR_CST
  - From: Jakub Jelinek
- Re: [PATCH] BIT_FIELD_REF on VECTOR_CST
  - From: Roger Sayle

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