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author | Jakub Kicinski <jakub.kicinski@netronome.com> | 2017-10-23 11:58:14 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2017-10-24 17:38:37 +0900 |
commit | 9f16c8abcd79fc31a74d3af64f085a009c9d4b5a (patch) | |
tree | d022dc299e72425908879b4373be6fde515f471f /fs/isofs/zisofs.h | |
parent | b14157eeed4eff2b293e0ca7738f6a3dbfff51cc (diff) | |
download | op-kernel-dev-9f16c8abcd79fc31a74d3af64f085a009c9d4b5a.zip op-kernel-dev-9f16c8abcd79fc31a74d3af64f085a009c9d4b5a.tar.gz |
nfp: bpf: optimize mov64 a little
Loading 64bit constants require up to 4 load immediates, since
we can only load 16 bits at a time. If the 32bit halves of
the 64bit constant are the same, however, we can save a cycle
by doing a register move instead of two loads of 16 bits.
Note that we don't optimize the normal ALU64 load because even
though it's a 64 bit load the upper half of the register is
a coming from sign extension so we can load it in one cycle
anyway.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'fs/isofs/zisofs.h')
0 files changed, 0 insertions, 0 deletions