From: Richard Henderson <rth@redhat.com>
To: Mohamed Shafi <shafitvm@gmail.com>
Cc: GCC <gcc@gcc.gnu.org>
Subject: Re: Supporting FP cmp lib routines
Date: Mon, 14 Sep 2009 14:49:00 -0000 [thread overview]
Message-ID: <4AAE580A.4080109@redhat.com> (raw)
In-Reply-To: <ba0bd44d0909140659u84447c2x32705cd72ce9d73a@mail.gmail.com>
On 09/14/2009 06:59 AM, Mohamed Shafi wrote:
> Is there a way to let GCC know that the result for FP compare
> are stored in the Status Register so that GCC generates directly a
> jump operation? How can i implement this?
There is no way to do this via the standard libcall sequence.
In order to implement this, you'll want to build the function
calls yourself, directly from the cbranch expanders. Have a
look at alpha_emit_xfloating_libcall for ideas.
You'll want to make sure that that your status register is set
up as the return value of the call pattern, i.e.
(set (reg:CC status-reg)
(call:CC (mem (symbol_ref "fp-compare-routine"))))
That should be about all you need to get things working.
r~
next prev parent reply other threads:[~2009-09-14 14:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-14 13:59 Mohamed Shafi
2009-09-14 14:49 ` Richard Henderson [this message]
2009-09-14 16:03 ` Richard Henderson
2009-10-23 14:32 ` Mohamed Shafi
2009-10-23 14:40 ` Joern Rennecke
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