------- Additional Comments From hjl dot tools at gmail dot com 2008-10-12 12:44 ------- (In reply to comment #6) > Created an attachment (id=2997) --> (http://sourceware.org/bugzilla/attachment.cgi?id=2997&action=view) > binutils-cvs-fix2-i386-nop.patch > > 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.
For assembler, PROCESSOR_UNKNOWN means CPU will take any instructions, including those new NOPs. If you want to limit NOPs to certain ISA, XXX, you need to use -match=XXX/-mtune=XXX. I checked in a patch http://sourceware.org/ml/binutils/2008-10/msg00124.html Now you can use the .arch directive to limit NOPs to XXX. -- http://sourceware.org/bugzilla/show_bug.cgi?id=6957 ------- You are receiving this mail because: ------- You are on the CC list for the bug, or are watching someone who is. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-binutils
