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| H A D | head_32.h | diff 2c59e5104821c5720e88bafa9e522f8bea9ce8fa Mon Feb 08 09:10:23 CST 2021 Christophe Leroy <christophe.leroy@csgroup.eu> powerpc/32: Reorder instructions to avoid using CTR in syscall entry
Now that we are using rfi instead of mtmsr to reactivate MMU, it is
possible to reorder instructions and avoid the need to use CTR for
stashing SRR0.
null_syscall on 8xx is reduced by 3 cycles (283 => 280 cycles).
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8fa13a59f73647e058c95fc7e1c7a98f316bd20a.1612796617.git.christophe.leroy@csgroup.eu
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