From: jeroen dobbelaere <jeroen.dobbelaere@acunia.com>
To: Alexandre Oliva <aoliva@redhat.com>
Cc: gcc <gcc@gcc.gnu.org>
Subject: Re: define_insn : order of matching patterns
Date: Tue, 04 Dec 2001 07:52:00 -0000 [thread overview]
Message-ID: <3C0CF0C5.6040904@acunia.com> (raw)
In-Reply-To: <orn10z5926.fsf@free.redhat.lsd.ic.unicamp.br>
Alexandre Oliva wrote:
> On Dec 4, 2001, jeroen dobbelaere <jeroen.dobbelaere@acunia.com> wrote:
>
>
>>1. Why doesn't the original pattern ('*mulhisi3addsi_left') get a match ?
>>
>
> Read about pattern canonicalization in the GCC manual.
>
>
Ok. Found it there :
<http://gcc.gnu.org/onlinedocs/gcc_21.html#SEC246>
* For commutative and comparison operators, [..]
if only one operand is a neg, not, mult, plus, or minus expression, it will be the first operand.
Thanks !
--
Jeroen Dobbelaere
Embedded Software Engineer
ACUNIA Embedded Solutions
http://www.acunia.com
prev parent reply other threads:[~2001-12-04 15:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-04 5:46 jeroen dobbelaere
2001-12-04 6:55 ` Alexandre Oliva
2001-12-04 7:52 ` jeroen dobbelaere [this message]
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