From: Richard Henderson <rth@redhat.com>
To: "Paulo J. Matos" <pocmatos@gmail.com>
Cc: gcc@gcc.gnu.org
Subject: Re: splitting add instructions
Date: Tue, 19 Jul 2011 15:42:00 -0000 [thread overview]
Message-ID: <4E25A5C5.8020606@redhat.com> (raw)
In-Reply-To: <j03gde$gba$1@dough.gmane.org>
On 07/19/2011 01:48 AM, Paulo J. Matos wrote:
> I have been looking at the rx port. Seems to be very similar to mine
> in that it has an add and adc where both set the flags and no
> explicit hard register for cc. Mine is actually simpler in that there
> is only CCmode since we don't have floating point operations in the
> chip. Will use rx as a guide! :)
Note that while RX has one mode for floating-point, it has
two other modes to deal with instructions that fail to set
all of the flags (or fails to set the flags in a way that
is useful for the comparison).
Depending on how regular your instructions are, you may
find that CCmode is not enough to eliminate all comparisons.
It is, however, a good start.
r~
next prev parent reply other threads:[~2011-07-19 15:42 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-18 16:49 Paulo J. Matos
2011-07-18 16:59 ` Richard Henderson
2011-07-18 17:31 ` Paul Koning
2011-07-18 21:20 ` Richard Henderson
2011-07-19 8:27 ` Paulo J. Matos
2011-07-19 10:21 ` Paulo J. Matos
2011-07-19 15:42 ` Richard Henderson [this message]
2011-07-19 15:58 ` Paulo J. Matos
2011-07-19 16:08 ` Paulo J. Matos
2011-07-19 16:43 ` Richard Henderson
2011-07-19 12:57 ` Paul Koning
2011-07-19 8:30 ` Paulo J. Matos
2011-07-19 10:30 ` Paulo J. Matos
2011-07-19 10:52 ` Paulo J. Matos
2011-07-19 15:06 ` Paulo J. Matos
2011-07-19 15:09 ` DJ Delorie
2011-07-19 15:21 ` Paulo J. Matos
2011-07-19 15:42 ` Richard Henderson
2011-07-19 15:42 ` Paulo J. Matos
2011-07-18 17:29 ` Ian Lance Taylor
2011-07-19 8:49 ` Paulo J. Matos
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