Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h

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To: Russell King <[email protected]>
Subject: Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h
From: Ian Molton <[email protected]>
Date: Wed, 25 Jan 2006 23:25:34 +0000
Cc: Akinobu Mita <[email protected]>, [email protected], Richard Henderson <[email protected]>, Ivan Kokshaysky <[email protected]>, [email protected], David Howells <[email protected]>, Yoshinori Sato <[email protected]>, Linus Torvalds <[email protected]>, [email protected], Hirokazu Takata <[email protected]>, [email protected], Greg Ungerer <[email protected]>, [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], Miles Bader <[email protected]>, Andi Kleen <[email protected]>, Chris Zankel <[email protected]>
In-reply-to: <[email protected]>
Organization: The Dragon Roost
References: <[email protected]> <[email protected]> <[email protected]>
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Russell King wrote:

This code generates more expensive shifts than our (ARMs) existing C
version.  This is a backward step.

Basically, shifts which depend on a variable are more expensive than
constant-based shifts.


arm26 will have the same problem here.

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References:
- [PATCH 0/6] RFC: use include/asm-generic/bitops.h
  - From: [email protected] (Akinobu Mita)
- [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h
  - From: [email protected] (Akinobu Mita)
- Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h
  - From: Russell King <[email protected]>

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