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Re: [PING] Re: SUBREGs and objects with holes

From: David Edelsohn <dje at watson dot ibm dot com>
To: Rask Ingemann Lambertsen <rask at sygehus dot dk>
Cc: Geoffrey Keating <geoffk at apple dot com>, gcc-patches at gcc dot gnu dot org
Date: Tue, 15 Aug 2006 12:53:51 -0400
Subject: Re: [PING] Re: SUBREGs and objects with holes
References: <200607191547.k6JFlr833934@makai.watson.ibm.com> <200608141758.k7EHwx828208@makai.watson.ibm.com> <E97DC0AE-2264-4B32-9E00-96FAB578F81B@apple.com> <200608142032.k7EKWX826228@makai.watson.ibm.com> <258CA653-FAAA-487C-81CF-A9C972432471@apple.com> <20060815162909.GA23169@sygehus.dk>

>>>>> Rask Ingemann Lambertsen writes:

Rask> The only interface a target offers to get all the required information is
Rask> HARD_REGNO_NREGS(). For example, when you have HARD_REGNO_NREGS (reg,
Rask> SImode) return 1 and HARD_REGNO_NREGS (reg, DFmode) also return 1, it tells
Rask> you that you can't represent subreg_regno_offset (reg, DFmode, 4, SImode).

	Actually, HARD_REGNO_NREGS and CANNOT_CHANGE_MODE_CLASS.
CANNOT_CHANGE_MODE_CLASS provides information about whether the mode has
individually addressible internal units.

David

References:
- [PING] Re: SUBREGs and objects with holes
  - From: David Edelsohn
- Re: [PING] Re: SUBREGs and objects with holes
  - From: Geoffrey Keating
- Re: [PING] Re: SUBREGs and objects with holes
  - From: David Edelsohn
- Re: [PING] Re: SUBREGs and objects with holes
  - From: Geoffrey Keating
- Re: [PING] Re: SUBREGs and objects with holes
  - From: Rask Ingemann Lambertsen

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