Re: Alternative C compilers on x86_64 Linux?

On 02/09/2016 04:01, Aharon Robbins wrote:


> TinyCC is blindingly fast, and can compile gawk, but is broken in that
> it won't diagnose duplicate case statements inside switch. The developers
> don't consider this a problem. So I refuse to use it.
>
> In short, I'm looking for a faster compiler that actually works.


I'm quite impressed with Tiny CC. I'd considered it a toy compiler that
could only compile a small subset of the language until I actually tried it.


And yes, on my Win64 version, it does seem to ignore duplicate 'case'
labels.


But TCC does have problem with compiling switch statements; although the
code it generates isn't that great anyway, that for switches is slower.


I suspect it just compiles switch as an if-else chain. Which might
explain why duplicate case labels are ignored if that conversion is done
at at early stage.


(Because a duplicate condition in an if-else chain is fine. For a
jump-table of course, a duplicate label is ambiguous so can't be allowed.)


--
Bartc

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