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2017-12-18target/xtensa: import libisa sourceMax Filippov1-0/+231
The canonical way of dealing with Xtensa instructions decoding and encoding is through the libisa. Libisa is a configuration-independent library with a stable interface plus generated configuration-specific xtensa-modules.c file with implementations of decoding and encoding functions. Libisa is MIT-licensed and originally disributed xtensa-modules.c files are also MIT-licensed and are available as a part of xtensa configuration overlay. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>