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On further reading of ISA manual it appears gas should have been treating mftb and mftbu as extended mnemonics for mfspr, for ISA 2.03 and later. opcodes/ * ppc-opc.c (powerpc_opcodes): Make mftb* generate mfspr for power4 and later. gas/testsuite/ * gas/ppc/a2.d: Update for mftb change. * gas/ppc/476.d: Likewise.