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Date: Sat, 25 Jul 2009 00:44:00 -0000
Message-ID: <6dc9ffc80907241723w18e945a5x6c665ec1780da6af@mail.gmail.com>
Subject: Re: Add crc32 function to libiberty
From: "H.J. Lu" <hjl.tools@gmail.com>
To: Ian Lance Taylor <iant@google.com>
Cc: gcc-patches@gcc.gnu.org, gdb-patches@sourceware.org, dj@redhat.com
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On Fri, Jul 24, 2009 at 3:49 PM, Ian Lance Taylor<iant@google.com> wrote:
> Some upcoming work in gold (by Sriraman Tallam) requires a CRC function.
> I could add a CRC function to gold, but I think it makes sense to add it
> to libiberty instead. =A0This CRC function is a copy of the one in gdb,
> except that the table of constants is precomputed. =A0The gdb maintainers
> may want to consider switching to this version--I don't think 1K of
> read-only data space is all that much these days.
>
> I am running a bootstrap on x86_64-unknown-linux-gnu and plan to commit
> this shortly.
>
> Ian
>
>
> include/ChangeLog:
>
> 2009-07-24 =A0Ian Lance Taylor =A0<iant@google.com>
>
> =A0 =A0 =A0 =A0* libiberty.h (crc32): Declare.
>
> libiberty/ChangeLog:
>
> 2009-07-24 =A0Ian Lance Taylor =A0<iant@google.com>
>
> =A0 =A0 =A0 =A0* crc32.c: New file.
> =A0 =A0 =A0 =A0* Makefile.in: Rebuild dependencies.
> =A0 =A0 =A0 =A0(CFILES): Add crc32.c.
> =A0 =A0 =A0 =A0(REQUIRED_OFILES): Add ./crc32.o.
> =A0 =A0 =A0 =A0* functions.texi: Rebuild.

Is that possible to use a compatible polynomia so that hardware
crc32 in SSE4.2 can be used if available?

Thanks.


--=20
H.J.