[Flac-dev] [PATCH] AltiVec Patch Updated for 1.1.1

Chris Csanady
Sat, 09 Oct 2004 06:18:15 -0000

Included is an updated patch against Flac 1.1.1.  Although I can not be
certain, I believe that
it will function under Linux as well as Darwin.  By default, the asm
versions of the functions
are disabled.  However, if you are on a Darwin system, you may enable
them with:

	CFLAGS=-DUSE_ASM_ALTIVEC_RESTORE ./configure

I have also included support to detect AltiVec and also PPC64
availability, which should work
with Linux as well.  Since the restore function is mostly serial, the
scalar code may be faster on
the ppc970 in many cases.  The same may be true for some of the 32 bit
functions.  The PPC64
check should allow these to be tuned as necessary.

Beware that these patches contain optimizations to several of the
encoder functions, so please
use this for testing purposes only.  They need to be thoroughly
examined and tested before
being used for real encodes.

Any feedback would be greatly appreciated.

-chris


PS Don't forget to run autogen.sh before configuring...

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