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powerpc64/bpf: Store temp registers' bpf to ppc mapping
In bpf_jit_build_body(), the mapping of TMP_REG_1 and TMP_REG_2's bpf register to ppc register is evalulated at every use despite not changing. Instead, determine the ppc register once and store the result. This will be more useful when a later patch introduces a more complex mapping from bpf registers to ppc registers. Signed-off-by: Jordan Niethe <jniethe5@gmail.com>
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