Messages in this thread | | | From | (Eric W. Biederman) | Subject | Re: Re : Re : Re : Re : [PATCH] Compressed ia32 ELF file generation for loading by Gujin 1/3 | Date | Tue, 06 Feb 2007 19:48:43 -0700 |
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"H. Peter Anvin" <hpa@zytor.com> writes:
> Etienne Lorrain wrote: >> H. Peter Anvin wrote: >>> I've long wished that someone would do a proper 16-bit x86 port of gcc; >> >>> however, the .code16gcc is usually good enough, although it produces code >>> which is a lot bigger than it needs to be. >> >> It is only that much bigger if you compare to 16 bits integer compilers, >> but once you deal with 32 bits integers in real mode you have one extra byte >> out of the two - which is still better than dealing with dx:ax. >> >> Last time I compiled (long time ago) some piece of code with and without >> .code16gcc it was approx 15% bigger - approx what you get when optimising. >> > > That's not a valid comparison, because you're using 32-bit registers to hold > 16-bit pointers, and then sticking 67 prefixes on completely unnecessarily.
Regardless if the size is good enough we can use it :)
For romcc I had a 3x code bloat over had crafted assembler, because I had no memory and had to inline every single function call because I didn't have someplace to put a return register. So I have the scenario with the most code bloat. I win!
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