Am 23.01.2014 02:38, schrieb Nikolay Nikolov: > On 01/22/2014 11:25 PM, Florian Klämpfl wrote: >> Am 22.01.2014 02:17, schrieb Nikolay Nikolov: >>> On 01/21/2014 11:20 PM, Florian Klämpfl wrote: >>>> It is still on my todo list though to update the peephole optimizer and >>>> make a common one for i386 and x86_64 ... >>> And don't forget i8086 :) >>> >> I think there is little to share that's why I didn't mention it :) > Well, x86 is x86 is x86. Most of the x86 code generator is already > shared in x86/cgx86.pas and that code is common for i8086, i386 and > x86_64.
Well, with "some" defines :) > IMHO, most of the peephole optimizations can be shared across > all x86. Only the 'lea'-related stuff wouldn't work on i8086 (because of > the register restrictions of 16-bit references) and there are some > optimizations, which are specific to i8086 (like converting certain > sequences of movs to lds/les). Everything involving addresses must be handled very carefully. A lot is movz/s, shifting or setxx related. So fear overlap is maybe 50% > Of course, I could be wrong, but that was > my opinion from looking at popt386.pas. It just looked to me that most > optimizations done there apply equally well to i8086 as well as x86_64 > and it was in my TODO list to eventually cleanup and unify the peephole > optimizer across all x86 Which is also on my todo list :) _______________________________________________ fpc-devel maillist - [email protected] http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
