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Re: What does SSE2 usage enhance? [message #39694 is a reply to message #39691]

Thu, 18 April 2013 06:34

mirek is currently offline

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

crydev wrote on Wed, 17 April 2013 16:04

mirek wrote on Wed, 17 April 2013 11:20

crydev wrote on Wed, 17 April 2013 04:54

p.s. My situation is copying blocks of 1~8 bytes very fast and very frequently in a loop. I have a chunk of memory which I loop though. Say my loop index currently is in the middle of my memory chunk, than it copies 4 bytes from the current index.

BTW, you might have a look at SVO_MEMCPY.

Thanks Mirek for your suggestion. I tried it but that one is actually a lot slower than the conventional memcpy. I stepped through the ASM though and it seems that the default memcpy is already partially optimzed for SSE2.

Are you really copying just 1-8 bytes? For such small amounts and unaligned data, SSE2 is IMO meaningless.

Mirek

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[Message index]

		What does SSE2 usage enhance? By: crydev on Wed, 10 April 2013 13:31
		Re: What does SSE2 usage enhance? By: mirek on Mon, 15 April 2013 18:34
		Re: What does SSE2 usage enhance? By: crydev on Wed, 17 April 2013 10:54
		Re: What does SSE2 usage enhance? By: mirek on Wed, 17 April 2013 11:17
		Re: What does SSE2 usage enhance? By: mirek on Wed, 17 April 2013 11:20
		Re: What does SSE2 usage enhance? By: crydev on Wed, 17 April 2013 22:04
		Re: What does SSE2 usage enhance? By: mirek on Thu, 18 April 2013 06:34
		Re: What does SSE2 usage enhance? By: crydev on Thu, 18 April 2013 08:33
		Re: What does SSE2 usage enhance? By: mirek on Thu, 18 April 2013 10:38
		Re: What does SSE2 usage enhance? By: crydev on Thu, 18 April 2013 11:43
		Re: What does SSE2 usage enhance? By: mirek on Thu, 18 April 2013 11:58

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