----- Reply to message ----- Subject: Re: [fpc-devel] Successful implementation of inline support for pure assembler routines on x86 Date: 2019. gada 17. marts 19:38:03 From: Florian Klämpfl <flor...@freepascal.org> To: <fpc-devel@lists.freepascal.org> > Am 15.03.19 um 11:32 schrieb J. Gareth Moreton: > * using inline assembler is always the worst > solution to do something, > it normally means either: > - the compiler misses a certain feature
Question is about, who is going to implement every imaginable feature in reasonable time frame? For example intrinsics for BMI. > - the compiler is generating bad code Generated code for x86_64 instruction set is pretty good, if pascal code is tuned to take advantaged of optimization currently done by compiler (LLVM target does not do any better). But assembler still give 10-20% boost. So there is still space for improvements. > * intrinsics provide a much better way to achieve > exactly what this > approach aims at: > - they enable the use of all registers as the > compiler does register > allocation sadly it does not apply to bsf > Is there any advantage over intrinsics, I missed > so far? To take advantage of flags changed by instruction. I looking forward for assembler inline functionality to be accepted. I would benefit of it. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
