initial vectorization functionality now in mainline

[Dorit Naishlos]

> The patch is ok.

thanks. tested on powerpc-apple-darwin7.0.0 and i686-pc-linux-gnu, and
committed.

New tests results:
on ppc-darwin:
# of expected passes            148
# of expected failures          38
on i686:
# of expected passes            132
# of expected failures          54

Comments:
1) Most of the xfails on i*86 and x86_64 are due to the new restriction I
added that considers STACK_BOUNDARY. Can something better be done for these
platforms? (should I check against PREFERRED_STACK_BOUNDARY instead?)

2) The current vectorization functionality in mainline is _very_ limited.
It will be significantly improved with the following patches for mainline
that are coming up:
- support for loops with unknown loop bound (or loop bound that doesn't
divide by the vectorization factor)
- support for misaligned accesses
- peeling to force alignment of accesses
- support for vectorization of conditional operations
- support for additional forms of data-references (including
multidimensional arrays)

Description of the vectorizer and it's current status can be found here:
http://gcc.gnu.org/projects/tree-ssa/vectorization.html
(last updated 4 weeks ago - I'll submit an update shortly)

dorit



                                                                                                                          
                      Richard Henderson                                                                                   
                      <rth@redhat.com>         To:       Dorit Naishlos/Haifa/IBM@IBMIL                                   
                                               cc:       gcc-patches@gcc.gnu.org, mitchell@mail.codesourcery.com          
                      17/08/2004 00:31         Subject:  Re: [patch] lno branch merge -- vectorizer patch #1              
                                                                                                                          




The patch is ok.


r~