Re: GCC SUN-4 code speed

In article <1016@soleil.UUCP> gendel@soleil.UUCP (Gary Gendel) writes:
>SUN (cc -O2)
>GCC 1.37.1 (gcc -O) 12% slower, same size executable
>GCC 1.37.1 (gcc -O -fstrength-reduce -finline-functions -fforce-mem)
> 6% slower, 50% larger executable.


If you look at gcc and compare it with the Dragon book's description of a
code generator generator, you will find aut that gcc has just about
everything a code geneator generator needs to have. Specification of
code to be matched, semantic attributes, constraints for operands, the
ability to simply emit a constant pattern or to use a piece of code to
find the exact instruction...


Note that if you look at gcc as a code generator generator, it is doing very
well indeed. Most generators cannot boast getting roughly equivalent
(or in some cases even better) performance than an equivalent hand-coded
program.
bye,
mike


Michael K. Gschwind mike@vlsivie.at
Technical University, Vienna mike@vlsivie.uucp
Voice: (++43).1.58801 8144 e182202@awituw01.bitnet
Fax: (++43).1.569697
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