Add a new file (dfp_helper.c) to the PowerPC implementation for Decimal Floating
Point (DFP) emulation. This first version of the file declares a structure that
will be used by DFP helpers. It also implements utilities that will initialize
such a structure for either a long (64 bit) DFP instruction or an extended (128
bit, aka "quad") instruction.
Some utility functions are annotated with the unused attribute in order to preserve
build bisection.
Signed-off-by: Tom Musta <tommusta@gmail.com>
[agraf: Add never reached assert on dfp_prepare_rounding_mode()]
Signed-off-by: Alexander Graf <agraf@suse.de>
