* avoid some more "movq %xmm0, %xmm0" instructions by setting the subreg

of function results to R_SUBMMWHOLE (default was R_SUBMMNONE, which didn't
    match registers allocated later)

git-svn-id: trunk@15384 -

compiler/x86_64/cpupara.pas

@@ -912,7 +912,10 @@ unit cpupara;
                             paraloc^.size:=OS_F64;
                           end;
                         else
-                          paraloc^.size:=OS_M64;
+                          begin
+                            setsubreg(paraloc^.register,R_SUBMMWHOLE);
+                            paraloc^.size:=OS_M64;
+                          end;
                       end;
                       inc(mmretregidx);
                     end;