Assembler in Lex/Yacc

Hi there,

I was working on an assembler for X64 architecture. I was wondering
what are the tradeoffs in designing an assembler using lex or re2c and
yacc? Why is that handwritten assemblers are more popular than those
developed using lex/yacc? Developing a grammar is the toughest part,
but once you have a grammar ready, I think the rest of the routines are
pretty strightforward? Is it that code generated by Lex/Yacc is not as
efficient?
YASM does get close, but again it resorts to hand written code at some
places.

Is it that Lex/Yacc is an overkill or is that Lex/Yacc are not the
right tools? I'm new to compiler and assembler design, and would be
helpful if anyone can guide.

Thanks!

.

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