Re: [rfc] PR tree-optimization/52633 - ICE due to vectorizer pattern detection collision

[Jakub Jelinek <jakub at redhat dot com>]

On Wed, Apr 25, 2012 at 10:29:36AM +0200, Richard Guenther wrote:
> > Does this look reasonable?  Any comments or suggestions appreciated!
> 
> Yes, getting rid of this fragile interaction by doing more work in
> vect_recog_widen_shift_pattern sounds like the correct thing to do.

Or give up when seeing already pattern recognized stmts when detecting
different pattern, unless the current pattern recognizer is prepared to
handle them (and in that case tweak everything as necessary).

E.g. several pattern recognizers already start with
  if (STMT_VINFO_IN_PATTERN_P (stmt_vinfo))
    return NULL;

	Jakub