Re: Which part of optimization is most important in a compiler?

> > I haven't taken the compiler course at college. Because my job is
> > to optimize code on DSP, I hope to understand compiler deep and begin
> > to read a compiler textbook. There are a lot of materials in a book,
> > but the overview of advanced compiling is not given in the book. ...


I have written many assembly codes for DSPs. Most time I try to use
SIMD instructions. Instruction scheduling is used to hide latency of
multi-cycle instructions, but almost every instruction is single cycle
instruction. Now only computation-intensive routines need to be
rewritten in assembly codes. So in my opinion, trying to use SIMD and
special instructions, which is hard to express in c language, is the
right way to improve performance.


Register allocation tries to reduce spill code, but in most curreent
DSPs stack is in cache or L1 SRAM, of which access latency is 1 cycle.


Best Regards
Jogging

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