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target/ppc: optimise ppcemb_tlb_t flushing
Filter TLB flushing by PID and mmuidx. Zoltan reports that, together with the previous TLB flush changes, performance of a sam460ex machine running 'lame' to convert a wav to mp3 is improved nearly 10%: CPU time TLB partial flushes TLB elided flushes Before 37s 508238 7680722 After 34s 73 1143 Tested-by: BALATON Zoltan <balaton@eik.bme.hu> Acked-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
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