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Full Discussion: Byte swap timing
Top Forums Programming Byte swap timing Post 302975301 by Corona688 on Friday 10th of June 2016 03:27:55 PM
Old 06-10-2016
Quote:
Originally Posted by migurus
(to Corona) newer compiler is better, I assume, but the timing of bswap suffered - how?
That bswap is slower then the macro does not mean bswap got worse, for all we know, the macro got optimized better, to a degree it exceeded the external bswap. Too many circumstances were changed to deduce anything from those numbers.

If you insist on a completely wild guess, I would wonder if bswap() in modern gcc is inline assembly, and the compiler is optimizing the macro into a bswap instruction. The compiler can do a better job optimizing instructions it makes than instructions you force it to use. But to get a definitive answer on what's going on you'll have to take a look at the assembly.
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sgen

Mono(sgen)																Mono(sgen)

NAME

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       Generates pre-compilable custom XML serializer classes for specific types.

OPTIONS

       --assembly[:filename] , -a
	      Specifies the assembly filename to process.

       --type[:typefullname] , -t
	      Explicitly specifies the runtime type to process.

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	      Specifies an assembly filename, which is referenced by the target assembly and thus required to process it.

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	      Indicates the compiler to keep generated temporary source files.

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AUTHOR

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COPYRIGHT

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MAILING LISTS

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WEB SITE

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SEE ALSO

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																	Mono(sgen)
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