strcat+strcat+strcat == baaad
david at l8s.co.uk
Mon Dec 2 13:15:09 CST 2002
> > It is as if the code from your program is executing far
> > slower than anything from libc!
> That is very well possible if he has the right libc. Take a look at the
> optimizations in the string functions in glibc, and you'll have an idea
> why. Unless you are a assembler programming Guru for a certain
> architecture, you'll have a hard time beating them.
I'm a fairly good assembler programmer....
Actually I don't have glibc - I'm running netbsd not linux.
Netbsd might benefit from faster strxxx routines.
OTOH the times are very dependant on the cpu model!
My slotA athlon 700 executes my str_add() faster the
way I coded it - I tried the other order and it sucked.
Similarly escaping with: lim[-1] = 0; return lim;
Of course you can use the same tricks as glibc does to speed
up your own variant of the copy routine.
David Laight: david at l8s.co.uk
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