Re: [Sdcc-user] Q about PIC14 pcode optimizer? Scott?

[Robert B. <aut...@zo...>]

Scott Dattalo wrote:

>
> The only problem is understanding GCC's architecture. I certainly 
> couldn't grasp it when I start working on SDCC several years ago. 
> Since then, I've had an opportunity to learn about GCC's RTL code. It 
> certainly is quite impressive in what it is capable of doing. And it 
> *is* flexible enough to accomodate the PIC's bizarre architecture.
>
>
I know what you mean... there's a fun diagram in "Porting GCC for 
Dunces" (ftp://ftp.axis.se/pub/users/hp/pgccfd/) on page 61, which shows 
the phases of porting a processor to GCC:

1. Read the processor's Programmer's Reference (result: Oh!)
2. Read GCC's "Using and Porting GCC" (result: WTF?!)
3. Read it several more times (result: decreasing levels of WTF, but 
some remaining)
4. Read through lots of GCC machine-specific code (result: Oh!)
5. Write your code, test, test, test until exhausted.

Personally, I never got to step 4, remaining in WTF mode :(

--Rob