[Bug target/48227] New: "rep ret" generated for -march=core2

[zuxy.meng at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48227

           Summary: "rep ret" generated for -march=core2
           Product: gcc
           Version: 4.5.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zuxy.meng@gmail.com


gcc 4.5 will use "rep; ret" for K8, Athlon, AMDFam10, Core2, and
generic.  Looking into the change history, we can see that gcc has padded
returns for Core2 ever since Core2 support was added here:
http://gcc.gnu.org/ml/gcc-patches/2006-11/msg00860.html

It is suspected
that Vlad just copied the generic tunings for Core2, and didn't notice
that there was no particular reason to pad returns for Core2.