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Re: [PATCH] Improved trailing bit counting operation

From: Daniel Gutson <dgutson at codesourcery dot com>
To: gcc-patches at gcc dot gnu dot org
Date: Tue, 18 Aug 2009 13:31:08 -0300
Subject: Re: [PATCH] Improved trailing bit counting operation
References: <4A557D1B.20502@codesourcery.com> <4A7B5A34.1010402@codesourcery.com>

Hi,
	friendly reminder: any update on this?

Thanks!
	Daniel.

Daniel Gutson wrote:

Hi,
  any update on this?
Thanks!
    Daniel.
Daniel Gutson wrote:
The attached patch improves the __builtin_ctz built-in function, which returns the number of trailing zero bits in a value, by using shorter instruction sequence for ARMv6T2 and later.

Please let me know any comment, or commit it for me since I don't have write access.
Thanks,
    Daniel.
---
07-09-2009  Daniel Gutson  <dgutson@codesourcery.com>
    gcc/
    * config/arm/arm.md (UNSPEC_RBIT): New constant.
    (rbitsi2): New insn.
    (ctzsi2): New expand.
    gcc/testsuite/
    * gcc.target/arm/ctz.c: New test case.


--
Daniel Gutson
CodeSourcery
www.codesourcery.com

Follow-Ups:
- Re: [PATCH] Improved trailing bit counting operation
  - From: Richard Earnshaw

References:
- Re: [PATCH] Improved trailing bit counting operation
  - From: Daniel Gutson

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