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Re: Writing Bits object to disk [message #47940 is a reply to message #47939]

Tue, 25 April 2017 13:35

crydev is currently offline

crydev
Messages: 151
Registered: October 2012
Location: Netherlands

Experienced Member

Thanks for your replies Mirek! I fixed my testcases, I realized I had a wrong check in my loop. The results now are:

index.php?t=getfile&id=5247&private=0

index.php?t=getfile&id=5247&private=0

Then, I applied your optimizations, and Bits became a little faster. However, It still is not as fast as Vector<bool>.

index.php?t=getfile&id=5248&private=0

index.php?t=getfile&id=5248&private=0

Quote:

Any ideas about the proper "raw data" interface?

I thought about making a constructor that allows construction of Bits from an existing buffer.

I also thought about vectorizing Bits set method. In theory, we could gather 16 bools, invert the bits in this bool, such that the most significant bit is 1 if the bool value is true, and 0 if it is false. Then, the _mm_movemask_epi8 intrinsic will generate an instruction that directly converts these 16 bools to a bitmask. We can also assume that 0x80 is true, for our inverted bool. Smile

Smile

crydev

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[Updated on: Tue, 25 April 2017 13:43]

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[Message index]

		Writing Bits object to disk By: crydev on Wed, 11 January 2017 17:07
		Re: Writing Bits object to disk By: mr_ped on Thu, 12 January 2017 01:20
		Re: Writing Bits object to disk By: crydev on Thu, 12 January 2017 09:03
		Re: Writing Bits object to disk By: mirek on Fri, 13 January 2017 08:39
		Re: Writing Bits object to disk By: crydev on Wed, 18 January 2017 08:51
		Re: Writing Bits object to disk By: crydev on Mon, 24 April 2017 19:19
		Re: Writing Bits object to disk By: mirek on Mon, 24 April 2017 21:08
		Re: Writing Bits object to disk By: crydev on Tue, 25 April 2017 09:36
		Re: Writing Bits object to disk By: dolik.rce on Tue, 25 April 2017 09:48
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 10:31
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 10:34
		Re: Writing Bits object to disk By: crydev on Tue, 25 April 2017 11:37
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 11:59
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 12:38
		Re: Writing Bits object to disk By: crydev on Tue, 25 April 2017 13:35
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 13:39
		Re: Writing Bits object to disk By: crydev on Tue, 25 April 2017 14:03
		Re: Writing Bits object to disk By: mirek on Tue, 25 April 2017 16:40
		Re: Writing Bits object to disk By: crydev on Wed, 26 April 2017 08:27
		Re: Writing Bits object to disk By: crydev on Wed, 26 April 2017 08:50
		Re: Writing Bits object to disk By: mirek on Wed, 26 April 2017 13:38
		Re: Writing Bits object to disk By: crydev on Thu, 27 April 2017 10:31
		Re: Writing Bits object to disk By: mirek on Thu, 27 April 2017 23:50
		Re: Writing Bits object to disk By: crydev on Fri, 28 April 2017 19:04
		Re: Writing Bits object to disk By: mirek on Sat, 29 April 2017 09:05
		Re: Writing Bits object to disk By: omari on Fri, 28 April 2017 19:31
		Re: Writing Bits object to disk By: mirek on Sat, 29 April 2017 09:53
		Re: Writing Bits object to disk By: crydev on Tue, 02 May 2017 22:54
		Re: Writing Bits object to disk By: mirek on Tue, 02 May 2017 23:55
		Re: Writing Bits object to disk By: crydev on Wed, 03 May 2017 09:00
		Re: Writing Bits object to disk By: mirek on Wed, 03 May 2017 09:53
		Re: Writing Bits object to disk By: crydev on Wed, 03 May 2017 11:12
		Re: Writing Bits object to disk By: mirek on Wed, 03 May 2017 11:27
		Re: Writing Bits object to disk By: crydev on Wed, 03 May 2017 12:24
		Re: Writing Bits object to disk By: mirek on Wed, 03 May 2017 12:37
		Re: Writing Bits object to disk By: crydev on Wed, 03 May 2017 18:33
		Re: Writing Bits object to disk By: crydev on Sat, 06 May 2017 10:28
		Re: Writing Bits object to disk By: crydev on Tue, 16 May 2017 09:12
		Re: Writing Bits object to disk By: mirek on Tue, 16 May 2017 10:39
		Re: Writing Bits object to disk By: mirek on Tue, 16 May 2017 13:12
		Re: Writing Bits object to disk By: crydev on Tue, 16 May 2017 20:17

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