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nfp: bpf: don't do ld/shifts combination if shifts are jump destination 

If any of the shift insns in the ld/shift sequence is jump destination,
don't do combination.

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jiong Wang 2017-11-30 21:32:53 -08:00 committed by Daniel Borkmann
parent 1266f5d655
commit 29fe46efba
1 changed files with 4 additions and 0 deletions
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4
drivers/net/ethernet/netronome/nfp/bpf/jit.c
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@ -2181,6 +2181,10 @@ static void nfp_bpf_opt_ld_shift(struct nfp_prog *nfp_prog)
if (next1.imm != 0x20 || next2.imm != 0x20)
continue;
if (meta2->flags & FLAG_INSN_IS_JUMP_DST ||
meta3->flags & FLAG_INSN_IS_JUMP_DST)
continue;
meta2->skip = true;
meta3->skip = true;
}