[Bug target/79545] New: gcc[5/6]: RS6000, xvcvuxdsp and xvcvsxdsp RTL defines have wrong type

["carll at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79545

            Bug ID: 79545
           Summary: gcc[5/6]: RS6000, xvcvuxdsp and xvcvsxdsp RTL defines
                    have wrong type
           Product: gcc
           Version: 6.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: carll at gcc dot gnu.org
  Target Milestone: ---

The following issue was found in gcc 6.1.  It also exists in gcc5.4.

The source and return operand types for xvcvuxdsp and xvcvsxdsp instructions
do not match the instruction definitions from the Power ISA document.  The
current code expects a V2DF source and returns V4SI.  The two instructions
should take a V2DI source and return V4SF.

Additionally, there is a typo in the instruction generation for the xvcvuxdsp
instruction generates instruction xvcvuxwdp instead of xvcvuxdsp.  The issues
are in file gcc/config/rs6000/vsx.md for define_insn "vsx_xvcvsxdsp" and 
define_insn "vsx_xvcvuxdsp" RTL statements.