according to www.linux-foundation.org/spec/refspecs/elf/x86_64-SysV-psABI.pdf
the registers should be in the order rax, rbx, rcx, rdx, gcc puts them in rax,
rdx, rcx, rbx.


-- 
           Summary: config/i386/i386.h  rbx and rdx dwarf register numbers
                    are switched.
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: npremji at redhat dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32982

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