Re: GCC optimizes integer overflow: bug or feature?

[Robert Dewar]

Brooks Moses wrote:

> Now, if your argument is that following the LIA-1 standard will prevent 
> optimizations that could otherwise be made if one followed only the C 
> standard, that's a reasonable argument, but it should not be couched as 
> if it implies that preventing the optimizations would not be following 
> the C standard.

I continue to suspect that the gains from this optimization are minimal
to non-existent in practice. Given the requirements in LIA-1, I would
think that taking advantage of overflow being undefined is only 
acceptable if there is very clear quantitative data showing that this
indeed is a significant optimization.