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Re: [PATCH] rs6000: Make cr5 allocatable
- From: David Edelsohn <dje dot gcc at gmail dot com>
- To: Segher Boessenkool <segher at kernel dot crashing dot org>
- Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 18 Jun 2014 15:47:14 -0400
- Subject: Re: [PATCH] rs6000: Make cr5 allocatable
- Authentication-results: sourceware.org; auth=none
- References: <10adfaa86a60b1bc978aa12fa58023ad5a1c4ea3 dot 1403098217 dot git dot segher at kernel dot crashing dot org>
On Wed, Jun 18, 2014 at 10:14 AM, Segher Boessenkool
<segher@kernel.crashing.org> wrote:
> A comment in rs6000.h says "cr5 is not supposed to be used". I checked
> all ABIs, going as far back as PowerOpen (1994), and found no mention
> of this.
>
> Also document cr6 is used by some vector instructions.
>
> Tested on powerpc64-linux, no regressions. Okay to apply?
>
>
> Segher
>
>
> 2014-06-18 Segher Boessenkool <segher@kernel.crashing.org>
>
> gcc/
> * config/rs6000/rs6000.h (FIXED_REGISTERS): Update comment.
> Remove cr5.
> (REG_ALLOC_ORDER): Update comment. Move cr5 earlier.
This is okay.
I have no idea why RMS assumed that cr5 is fixed.
Thanks, David