This is the mail archive of the
binutils@sourceware.org
mailing list for the binutils project.
Re: gas feature: support for larger bit immediates in bt
- From: "H.J. Lu" <hjl at lucon dot org>
- To: Andi Kleen <ak at suse dot de>
- Cc: binutils at sources dot redhat dot com
- Date: Wed, 19 Sep 2007 06:41:21 -0700
- Subject: Re: gas feature: support for larger bit immediates in bt
- References: <200709191412.39698.ak@suse.de>
On Wed, Sep 19, 2007 at 02:12:39PM +0200, Andi Kleen wrote:
>
> One feature that gas is currently missing and what would be sometimes nice
> to have is to support offsets >31 in the bt etc. family of instructions
> by folding the value/32 into an byte memory offset.
>
> e.g. bt $64,(%rax) can be converted to bt $0,8(%rax)
>
> The IA32 instruction reference manual even mentions that some assemblers
> support this.
Please open a binutils bug report at
http://www.sourceware.org/bugzilla/
H.J.