[Bug target/48258] New: Add VSX support for float/double vector reductions & improve float insert/extract

[meissner at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48258



           Summary: Add VSX support for float/double vector reductions &

                    improve float insert/extract

           Product: gcc

           Version: 4.7.0

            Status: UNCONFIRMED

          Severity: enhancement

          Priority: P3

         Component: target

        AssignedTo: meiss...@gcc.gnu.org

        ReportedBy: meiss...@gcc.gnu.org

              Host: powerpc64-linux

            Target: powerpc64-linux

             Build: powerpc64-linux





Right now, the powerpc compiler does not do support for float and double vector

reductions.  For float in particular, the compiler does the code, and then

stores the vector in the stack to extract the bottom element.  With VSX it is

possible to do vector reductions in fewer instructions and to eliminate the

store.