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Instructions lmw/stmw are interesting for functions that are rarely used and not in the cache, because only one instruction is to be copied into the instruction cache instead of 19. However those instruction are less performant than 19x raw lwz/stw as they require synchronisation plus one additional cycle. SAVE_NVGPRS / REST_NVGPRS are used in only a few places which are mostly in interrupts entries/exits and in task switch so they are likely already in the cache. Using standard lwz improves null_syscall selftest by: - 10 cycles on mpc832x. - 2 cycles on mpc8xx. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/316c543b8906712c108985c8463eec09c8db577b.1629732542.git.christophe.leroy@csgroup.eu |
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