diff options
Diffstat (limited to 'drivers/net/ethernet/netronome/nfp/bpf/jit.c')
| -rw-r--r-- | drivers/net/ethernet/netronome/nfp/bpf/jit.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/net/ethernet/netronome/nfp/bpf/jit.c b/drivers/net/ethernet/netronome/nfp/bpf/jit.c index aa3a2098a583..093b8ff80241 100644 --- a/drivers/net/ethernet/netronome/nfp/bpf/jit.c +++ b/drivers/net/ethernet/netronome/nfp/bpf/jit.c @@ -1967,6 +1967,9 @@ static int neg_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __shl_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst + 1), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, @@ -2079,6 +2082,9 @@ static int shl_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __shr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, shift_amt); @@ -2180,6 +2186,9 @@ static int shr_reg64(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) */ static int __ashr_imm64(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { + if (!shift_amt) + return 0; + if (shift_amt < 32) { emit_shf(nfp_prog, reg_both(dst), reg_a(dst + 1), SHF_OP_NONE, reg_b(dst), SHF_SC_R_DSHF, shift_amt); @@ -2388,10 +2397,13 @@ static int neg_reg(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) static int __ashr_imm(struct nfp_prog *nfp_prog, u8 dst, u8 shift_amt) { - /* Set signedness bit (MSB of result). */ - emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR, reg_imm(0)); - emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, reg_b(dst), - SHF_SC_R_SHF, shift_amt); + if (shift_amt) { + /* Set signedness bit (MSB of result). */ + emit_alu(nfp_prog, reg_none(), reg_a(dst), ALU_OP_OR, + reg_imm(0)); + emit_shf(nfp_prog, reg_both(dst), reg_none(), SHF_OP_ASHR, + reg_b(dst), SHF_SC_R_SHF, shift_amt); + } wrp_immed(nfp_prog, reg_both(dst + 1), 0); return 0; @@ -2433,12 +2445,10 @@ static int shl_imm(struct nfp_prog *nfp_prog, struct nfp_insn_meta *meta) { const struct bpf_insn *insn = &meta->insn; - if (!insn->imm) - return 1; /* TODO: zero shift means indirect */ - - emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), - reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), - SHF_SC_L_SHF, insn->imm); + if (insn->imm) + emit_shf(nfp_prog, reg_both(insn->dst_reg * 2), + reg_none(), SHF_OP_NONE, reg_b(insn->dst_reg * 2), + SHF_SC_L_SHF, insn->imm); wrp_immed(nfp_prog, reg_both(insn->dst_reg * 2 + 1), 0); return 0; |