https://sourceware.org/bugzilla/show_bug.cgi?id=20795
Alan Modra <amodra at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |amodra at gmail dot com
Resolution|--- |INVALID
--- Comment #1 from Alan Modra <amodra at gmail dot com> ---
The default disassembly dialect is currently power9 with PPC_OPCODE_ANY
enabled. So in cases where an opcode disassembles differently between power9
and some other cpu, the power9 variant is chosen, and when there is no power9
insn for a given opcode but there is a valid insn for some other cpu then that
other cpu insn is displayed. This means that people can often use objdump to
disassemble without specifying -M<the_right_cpu>.
Your code selects a fairly generic arch/mach combination and doesn't set
disInfo.disassembler_options, resulting in the default dialect. See
ppc-dis.c:powerpc_init_dialect.
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