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Re: Not pulling out obvious non-aliasing global from the loop

From: Daniel Berlin <dberlin at dberlin dot org>
To: Andrew Pinski <pinskia at physics dot uc dot edu>
Cc: "gcc at gcc dot gnu dot org List" <gcc at gcc dot gnu dot org>
Date: Wed, 25 Aug 2004 23:36:56 -0400
Subject: Re: Not pulling out obvious non-aliasing global from the loop
References: <A4945A7C-F710-11D8-A009-00039351ED8A@physics.uc.edu>

On Aug 25, 2004, at 11:33 PM, Andrew Pinski wrote:

While working on a loop pass, I noticed that we were not pulling out the load from a global variable from a loop where it obviously cannot alias anything in the loop. This seems like it would hurt the vectorizer also.
This example comes from bzip2:
unsigned short *q;
#define NOSB 10
void h1(int last)
{
  int i;
  for (i=0;i<last+NOSB;i++)
    q[i] = 0;
}
Tree a

Kenny is working on this, I believe.

References:
- Not pulling out obvious non-aliasing global from the loop
  - From: Andrew Pinski

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