llvm dev - Jun 2013 - [LLVMdev] Error in the example of sext instruction in reference manual

Thanks for the reply. Just for a little more clarity, is i16, i32...
signed, unsigned, or just a bit pattern?



On Thu, Jun 20, 2013 at 9:17 PM, Chris Lattner <clattner at apple.com>
wrote:
>
> On Jun 20, 2013, at 4:39 PM, Bin Tzeng <bintzeng at gmail.com> wrote:
>
> > Hi all,
> >
> > There might be a simple error in the LLVM reference manual. The
example
> for sext instruction:
> >
> > %X = sext i8 -1 to i16     ; yields i16    :65535
> >
> > %X should yield i16: -1, as opposed to 65535.
> > Here is the simple patch (also attached):
>
> These are the same value.
>
> -Chris
>
> >
> > Index: docs/LangRef.rst
> > ==================================================================>
> --- docs/LangRef.rst    (revision 184496)
> > +++ docs/LangRef.rst    (working copy)
> > @@ -5236,7 +5236,7 @@
> >
> >  .. code-block:: llvm
> >
> > -      %X = sext i8  -1 to i16              ; yields i16   :65535
> > +      %X = sext i8  -1 to i16              ; yields i16:-1
> >        %Y = sext i1 true to i32             ; yields i32:-1
> >        %Z = sext <2 x i16> <i16 8, i16 7> to <2 x
i32> ; yields <i32 8,
> i32 7>
> >
> >
> > Thanks!
> > Bin
> >
<sextExample.diff>_______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
>
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> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu] On Behalf Of Bin Tzeng
> Subject: Re: [LLVMdev] Error in the example of sext instruction in
reference manual
> Just for a little more clarity, is i16, i32... signed, unsigned, or 
> just a bit pattern?
It's just a bit pattern.  The operations performed on it can treat it as
signed, unsigned, or whatever, as appropriate.

 - Chuck


THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
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Thanks for the clarification!


On Fri, Jun 21, 2013 at 9:04 AM, Caldarale, Charles R <
Chuck.Caldarale at unisys.com> wrote:
> > From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
> On Behalf Of Bin Tzeng
> > Subject: Re: [LLVMdev] Error in the example of sext instruction in
> reference manual
>
> > Just for a little more clarity, is i16, i32... signed, unsigned, or
> > just a bit pattern?
>
> It's just a bit pattern.  The operations performed on it can treat it
as
> signed, unsigned, or whatever, as appropriate.
>
>  - Chuck
>
>
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is thus for use only by the intended recipient. If you
> received this in error, please contact the sender and delete the e-mail and
> its attachments from all computers.
>
>
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