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Re: [PATCH] Fix PR15791



On Jan 27, 2005, at 9:57 AM, Richard Guenther wrote:


Hi!

This patch adds the capability to fold comparisons of the form
&a[i] OP &a[j] (or plain a) as in PR15791.  It does not handle
&x.a[i] OP &x.a[j] currently, as these are presented in a
different lowered form to fold.

Bootstrapped and tested on i686-pc-linux-gnu.  Ok?
(if yes, please apply)

Richard.

I don't think it handles the following C testcase (which should return true)
as the size of the struct is zero (this is unlike C++):


struct a{};

int f()
{
  struct a b[2];
  return &b[0] == &b[1];
}

-- Pinski


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