[vorbis-dev] SIMD instructions
mpxplay at freemail.hu
Thu Jan 30 16:36:37 PST 2003
Hello, just some comments:
SSE2 uses 64-bit floats, Vorbis uses 32-bit...
If we use 64-bit precision instead of 32, the result will be different.
I've made an encoder/decoder with 64-bit precision
(I've changed float(s) to double(s) almost everywhere),
but the sound-result has changed, the tone was a little
different (not correct).
The new (v1.0) huffman/codebook decoding is not
really good if we want to make a fast assembly code (normal x86).
It's easier to omptimize the older (RC3) routines...
(ie: we can do nothing with the bitreverse() function in asm)
<p><p><p>--- >8 ----
List archives: http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this list, send a message to 'vorbis-dev-request at xiph.org'
containing only the word 'unsubscribe' in the body. No subject is needed.
Unsubscribe messages sent to the list will be ignored/filtered.
More information about the Vorbis-dev