target-ppc: Implement bcdctn. instruction
bcdctn. converts from BCD to National numeric format. National format uses a byte to represent a digit where the most significant nibble is always 0x3 and the least sign. nibbles is the digit itself. Signed-off-by: NJose Ricardo Ziviani <joserz@linux.vnet.ibm.com> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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