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Re: Socket Communication 101 [message #38262 is a reply to message #38236]

Sat, 08 December 2012 15:37

lectus
Messages: 329
Registered: September 2006
Location: Brazil

Senior Member

Yes, there's some optimization at CPU level when you compare a char with \0.

In ASM code a comparison happens like this:

CMP AX, ','
JZ FOUND_COMMA
.
.
.
FOUND_COMMA:
; Do something...

When you compare to zero it happens like this:

CMP AX, 0
JZ FOUND_ZERO
.
.
.
FOUND_ZERO:
; Do something...

The same with some instruction optimization:

XOR AX, AX
JZ FOUND_ZERO
.
.
.
FOUND_ZERO:
; Do something...

XOR instruction is a few bytes smaller than CMP, but XOR raises a CPU flag and so it works to compare to zero.
This saves a few CPU cycles. But with a good compiler and modern CPUs it becomes irrelevant.

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[Message index]

		Socket Communication 101 By: nejnadusho on Fri, 07 December 2012 18:02
		Re: Socket Communication 101 By: nlneilson on Fri, 07 December 2012 18:20
		Re: Socket Communication 101 By: nejnadusho on Fri, 07 December 2012 18:52
		Re: Socket Communication 101 By: lectus on Fri, 07 December 2012 19:29
		Re: Socket Communication 101 By: nlneilson on Fri, 07 December 2012 19:45
		Re: Socket Communication 101 By: mirek on Fri, 07 December 2012 20:14
		Re: Socket Communication 101 By: nlneilson on Fri, 07 December 2012 20:53
		Re: Socket Communication 101 By: lectus on Fri, 07 December 2012 20:57
		Re: Socket Communication 101 By: nlneilson on Fri, 07 December 2012 22:08
		Re: Socket Communication 101 By: nlneilson on Fri, 14 December 2012 10:07
		Re: Socket Communication 101 By: nlneilson on Sat, 15 December 2012 16:37
		Re: Socket Communication 101 By: nlneilson on Tue, 16 April 2013 03:54
		Re: Socket Communication 101 By: mirek on Tue, 16 April 2013 08:22
		Re: Socket Communication 101 By: nlneilson on Tue, 16 April 2013 19:51
		Re: Socket Communication 101 By: mirek on Tue, 16 April 2013 20:06
		Re: Socket Communication 101 By: nlneilson on Tue, 16 April 2013 22:43
		Re: Socket Communication 101 By: mirek on Wed, 17 April 2013 08:03
		Re: Socket Communication 101 By: nlneilson on Sun, 05 May 2013 02:45
		Re: Socket Communication 101 By: lectus on Fri, 07 December 2012 20:41
		Re: Socket Communication 101 By: lectus on Sat, 08 December 2012 00:42
		Re: Socket Communication 101 By: nlneilson on Sat, 08 December 2012 02:36
		Re: Socket Communication 101 By: lectus on Sat, 08 December 2012 15:37
		Re: Socket Communication 101 By: nlneilson on Sat, 08 December 2012 16:48
		Re: Socket Communication 101 By: nejnadusho on Sun, 09 December 2012 05:11

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