On Jan 4, 10:52*am, "srbli...@gmail .com" <srbli...@gmail .comwrote:
*Where we use Register data type varible
I don't think register (note all lower case) is a data type.
It's a modifier I think.
The usual answer on comp.lang.c is that register is a suggestion
to the compiler which it is at liberty to ignore. With modern
compilers register is unnecessary as the compiler does a better job
than a human. [this applies 99% occasionally judicious use of
register may beat the compiler. But you'd probably have to know
your compiler really well and you *must* measure your programs
performance with actual data]
in Device drivers?
ah. Well some embedded compilers may be less good. But the
same advice applies. Examine the assembler output with and
without register. Measure the performance with real data.
* *Before the .obj or .exe Generation where we use register data type
* *Declaration.
what? register to the best of my knowlege is a source level
thingy. I don't see what it has to do with obj and .exe files.
Anway obj and exe are compiler specific you need a compiler
specific or embedded group for these sort of details.
--
Nick Keighley
