Mail Archives: djgpp/1993/07/07/20:09:40
Just out of curiosity, does anybody know what the -m486 switch
does? I have never found it to speed up anything, but I have found it
can slow things down. (Yes, I have a 486.)
It will replace some of the complex 386 instructions by an inline
collection of 486 code which will speed up the program on the 486.
For example :
i386 :
jcxz some_label ; 5 clock cycles
i486 :
or cx,cx ; 1 clock cycle
jz short some_label ; 1 clock cycle
and so on...
Regards,
Rami
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