nfp: bpf: optimize codegen for JSET with a constant

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The top word of the constant can only have bits set if sign
extension set it to all-1, therefore we don't really have to
mask the top half of the register.  We can just OR it into
the result as is.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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Jakub Kicinski 2018-12-19 22:13:08 -08:00 • committed by Daniel Borkmann

parent 6e774845b3

commit 4987eaccd2

1 changed files with 10 additions and 12 deletions

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drivers/net/ethernet/netronome/nfp/bpf/jit.c

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