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: Fix thumb1 size cost of small constants

From: Richard Earnshaw <rearnsha at arm dot com>
To: Maxim Kuvyrkov <maxim at codesourcery dot com>
Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>
Date: Thu, 24 Jun 2010 11:22:54 +0100
Subject: Re: Fix thumb1 size cost of small constants
References: <4C18F225.2040509@codesourcery.com> <4C227243.9080104@codesourcery.com> <4C22771B.9000904@codesourcery.com>

On Thu, 2010-06-24 at 01:05 +0400, Maxim Kuvyrkov wrote:
> This patch fixes thumb1 size cost of small constants.
> 
> Currently, the cost of SET of a constant is set to zero, which is odd 
> considering that it still takes one instruction to do the operation. 
> The code for Thumb2 and ARM modes returns COSTS_N_INSNS (1) for similar 
> case, so the patch makes Thumb1 cost agree with ARM and Thumb2 cost.
> 
> OK to check in?
> 
> Thank you,

OK.

R.

References:
- Improvements to code hoisting
  - From: Maxim Kuvyrkov
- ARM improvements for GCSE
  - From: Maxim Kuvyrkov
- Fix thumb1 size cost of small constants
  - From: Maxim Kuvyrkov

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