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Paul Mackerras 9e8fb293ed FPU: Implement floating convert from integer instructions

This implements fcfid, fcfidu, fcfids and fcfidus, which convert
64-bit integer values in an FPR into a floating-point value.
This brings in a lot of the datapath that will be needed in
future, including the shifter, adder, mask generator and
count-leading-zeroes logic, along with the machinery for rounding
to single-precision or double-precision, detecting inexact results,
signalling inexact-result exceptions, and updating result flags
in the FPSCR.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

2020-09-03 17:44:41 +10:00

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 test 01:PASS
 test 02:PASS
 test 03:PASS
 test 04:PASS
 test 05:PASS
 test 06:PASS
 test 07:PASS