target-xtensa: implement LSCX and LSCI groups
These are load/store instructions for FP registers with immediate or register index and optional base post-update. See ISA, 4.3.10 for more details. Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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