[Bug inline-asm/56148] [4.8 Regression] inline asm matching constraint with different mode

[vmakarov at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56148

Vladimir Makarov <vmakarov at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |vmakarov at redhat dot com

--- Comment #12 from Vladimir Makarov <vmakarov at redhat dot com> 2013-02-12 18:52:05 UTC ---
(In reply to comment #10)
> Vlad, could you please explain a bit how you figured out this issue
> so quickly? (I mean, apart from experience, of course.)

Actually I worked on this for 2.5 days.  The patch affects very sensitive LRA
code.  I think there is very small probability that the patch affects other
targets (so I am going to do a merge trunk into lra branch at the end of week).

The problem was in using the same pseudo for two input operands only one of
which is matching the same pseudo which is an earlyclobber.