From: Bernd Schmidt <bernds@codesourcery.com>
To: Mohamed Shafi <shafitvm@gmail.com>
Cc: GCC <gcc@gcc.gnu.org>
Subject: Re: Need help in deciding the instruction set for a new target.
Date: Mon, 23 Aug 2010 20:24:00 -0000 [thread overview]
Message-ID: <4C72C30F.4010003@codesourcery.com> (raw)
In-Reply-To: <AANLkTimKoa7xNV4dgqQdysJGB6bc2_O7bQrKruiMXhEL@mail.gmail.com>
On 08/23/2010 08:05 PM, Mohamed Shafi wrote:
> sub.s32 srcdstGP, #imm16 // signed 16-bit register to immediate subtract
> sub.u32 srcdstGP, #imm16 // unsigned 16-bit register to immediate subtract
If you're using a bit to decide between these two, a better encoding
would be to just support a single instruction with a signed 17bit immediate.
Bernd
next prev parent reply other threads:[~2010-08-23 18:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 18:25 Mohamed Shafi
2010-08-23 19:00 ` Ian Lance Taylor
2010-08-23 20:24 ` Bernd Schmidt [this message]
2010-08-23 22:20 ` Richard Henderson
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