diff options
| author | Jakub Kicinski | 2018-04-25 06:22:39 +0200 |
|---|---|---|
| committer | Daniel Borkmann | 2018-04-25 09:56:10 +0200 |
| commit | 7bdc97be9075c074be0f0aa9c59a8d2238224743 (patch) | |
| tree | 16281ac7de8247d60c728a93b7db5bc92a1e74ca /drivers/net/ethernet/netronome/nfp/bpf/main.h | |
| parent | nfp: bpf: tabularize generations of compare operations (diff) | |
| download | kernel-qcow2-linux-7bdc97be9075c074be0f0aa9c59a8d2238224743.tar.gz kernel-qcow2-linux-7bdc97be9075c074be0f0aa9c59a8d2238224743.tar.xz kernel-qcow2-linux-7bdc97be9075c074be0f0aa9c59a8d2238224743.zip | |
nfp: bpf: optimize comparisons to negative constants
Comparison instruction requires a subtraction. If the constant
is negative we are more likely to fit it into a NFP instruction
directly if we change the sign and use addition.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/main.h')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/main.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/main.h b/drivers/net/ethernet/netronome/nfp/bpf/main.h index 4981c8944ca3..68b5d326483d 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/main.h +++ b/drivers/net/ethernet/netronome/nfp/bpf/main.h @@ -236,6 +236,7 @@ struct nfp_bpf_reg_state { * @xadd_over_16bit: 16bit immediate is not guaranteed * @xadd_maybe_16bit: 16bit immediate is possible * @jmp_dst: destination info for jump instructions + * @jump_neg_op: jump instruction has inverted immediate, use ADD instead of SUB * @func_id: function id for call instructions * @arg1: arg1 for call instructions * @arg2: arg2 for call instructions @@ -264,7 +265,10 @@ struct nfp_insn_meta { bool xadd_maybe_16bit; }; /* jump */ - struct nfp_insn_meta *jmp_dst; + struct { + struct nfp_insn_meta *jmp_dst; + bool jump_neg_op; + }; /* function calls */ struct { u32 func_id; |