[Bug tree-optimization/18065] usual arithmetic conversion not applying correctly

[jsm at polyomino dot org dot uk]

------- Additional Comments From jsm at polyomino dot org dot uk  2004-10-20 22:41 -------
Subject: Re:  usual arithmetic conversion not applying correctly

On Wed, 20 Oct 2004, schlie at comcast dot net wrote:

>  It's a pretty major screw-up to presume
>  all target machines are large, and then to encode that presumption into
>  C's front end; not to mention it seems pretty stupid to do, and then

This is not a GCC presumption, it is a property of the C language that 
there are certain promotions that may not be optimally efficient for 8-bit 
targets.  If there is a "major screw-up", it is either in the choice to 
use a language designed for systems that are at least 16-bit on an 8-bit 
target, or in the language design if you think 8-bit targets should have 
been given greater importance when the language was being standardised in 
the 1980s; it is nothing to do with the front end.  The AVR target has a 
-mint8 option which puts the compiler in a nonconforming mode with 8-bit 
int, which might however give you better code than you can get with 
standard C on an 8-bit target.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18065