At present, decode2 does some formatting of the input data for the
multiply unit - truncation to 32 bits for 32-bit operations and then
sign or zero extension to 65 bits. This is going to prevent forwarding
of results within the execute pipeline in future, so we move the
formatting to the first cycle of the multiply pipeline.
It turns out that we have a wasted cycle at the front of the multiply
pipe, because decode2 has a register at its output and multiply has
a register at its input. For now we use this cycle to do the data
formatting.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
