This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: [PATCH] Update instruction cost for LEON

From: Daniel Cederman <cederman at gaisler dot com>
To: Eric Botcazou <ebotcazou at adacore dot com>
Cc: gcc-patches at gcc dot gnu dot org, daniel at gaisler dot com
Date: Tue, 07 Jul 2015 14:15:28 +0200
Subject: Re: [PATCH] Update instruction cost for LEON
Authentication-results: sourceware.org; auth=none
Authorized-sender: support at gaisler dot com
References: <1435925299-6629-1-git-send-email-cederman at gaisler dot com> <1435925299-6629-3-git-send-email-cederman at gaisler dot com> <1706129 dot J6Xr83SIkg at polaris>

On 2015-07-07 12:37, Eric Botcazou wrote:

2015-07-03  Daniel Cederman  <cederman@gaisler.com>

	* config/sparc/sparc.c (struct processor_costs): Set div cost
	for leon to match UT699 and AT697F. Set mul cost for leon3 to
	match standard leon3.


So UT699 is not a standard LEON3?

LEON3 exists in multiple revisions and is configurable so I agree thatusing the word standard in this context is a bit ambiguous.

I think we should delay applying this patch. First we need to look intohow to properly provide the information on FPU selection and multipliersize to GCC. Otherwise we risk having to change the values again in ashort while.


--
Daniel Cederman

References:
- [PATCH] Do not use floating point registers when compiling with -msoft-float for SPARC
  - From: Daniel Cederman
- [PATCH] Update instruction cost for LEON
  - From: Daniel Cederman
- Re: [PATCH] Update instruction cost for LEON
  - From: Eric Botcazou

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]