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[Bug gas/6957] i386 NOPs must be derived from march not mtune

From: swanson at ukfsn dot org
Subject: [Bug gas/6957] i386 NOPs must be derived from march not mtune
Date: 12 Oct 2008 10:20:08 -0000

------- Additional Comments From swanson at ukfsn dot org  2008-10-12 10:20 
Created an attachment (id=2997)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2997&action=view)

Add bitfield checking back to patch for .arch settings.

First point, do you not first agree that choosing instructions based on mtune
is seriously broken?

The other point here is about compatibility. Yes, these CPUs are missing this
one instruction but since most builds these days are i686 by default this will
break on these systems for users. It's only been fortunate that GCC strips out
mtune options to gas. The optimisation lost is minor.

I'm obviously an unknown person but the link given shows Linus Torvalds opinion
on this which may or not mean much to you. 

           What    |Removed                     |Added
Attachment #2995 is|0                           |1
           obsolete|                            |


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