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Re: [PATCH] Fix regression parts of PR58742


On Mon, Oct 21, 2013 at 01:30:37PM +0200, Richard Biener wrote:
> This fixes a regression introduced in GCC 4.2 after which we no
> longer fold (unsigned) (X /[ex] 4) * 4 to (unsigned) X.
> 
> Bootstrapped and tested on x86_64-unknown-linux-gnu, applied to trunk.

Don't we want to do the same optimization on GIMPLE?
I mean, if the testcase is
int *
fx (int *b, int *e)
{
  ptrdiff_t p = e - b;
  return b + p;
}

(or s/ptrdiff_t/long long/, etc.)?

	Jakub


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