[patch tree-optimization]: Try to sink type-casts for binary and/or/xor operations

Kai Tietz ktietz@redhat.com
Mon Jun 27 17:09:00 GMT 2011


Hi,

so I modified patch to use int_fits_type_p() for integer CST checking.  Well, this approach is - as discussed on IRC suboptimal - as my intial approach was for and-operations with precision type > precision type-x and unsigned type-x for constant values bigger then (type-x)~0.
But well, those we miss now by int_fits_type_p() approach, too. And also we miss now the cases for that type is signed and type-x is unsigned with same precision.

Anyway ... here is the updated patch

Regards,
Kai

----- Original Message -----
From: "Richard Guenther" <richard.guenther@gmail.com>
To: "Kai Tietz" <ktietz@redhat.com>
Cc: gcc-patches@gcc.gnu.org
Sent: Monday, June 27, 2011 4:08:41 PM
Subject: Re: [patch tree-optimization]: Try to sink type-casts for binary and/or/xor operations

On Mon, Jun 27, 2011 at 3:46 PM, Kai Tietz <ktietz@redhat.com> wrote:
> Hello,
>
> this patch sink type conversions in forward-propagate for the following patterns:
> - ((type) X) op ((type) Y): If X and Y have compatible types.
> - ((type) X) op CST: If the conversion of (type) ((type-x) CST) == CST and X has integral type.
> - CST op ((type) X): If the conversion of (type) ((type-x) CST) == CST and X has integral type.

See IRC comments.

> Additionally it fixes another issue shown by this type-sinking in bswap detection. The bswap pattern matching algorithm goes for the first hit, and not tries to seek for best hit.  So we search here two times. First for di case (if present) and then for si mode case.

Please split this piece out.  I suppose either walking over stmts backwards
or simply handling __builtin_bswap in find_bswap_1 would be a better
fix than yours.

Richard.

> ChangeLog
>
> 2011-06-27  Kai Tietz  <ktietz@redhat.com>
>
>        * tree-ssa-forwprop.c (simplify_bitwise_binary): Improve
>        type sinking.
>        * tree-ssa-math-opts.c (execute_optimize_bswap): Separate
>        search for di/si mode patterns for finding widest match.
>
> Bootstrapped and regression tested for x86_64-pc-linux-gnu.  Ok for apply?
>
> Regards,
> Kai
>
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