From cadaecd2188b99d93de676150007f0e097223232 Mon Sep 17 00:00:00 2001 From: Denis Kirjanov Date: Mon, 17 Nov 2014 23:07:41 +0300 Subject: [PATCH] PPC: bpf_jit_comp: Unify BPF_MOD | BPF_X and BPF_DIV | BPF_X Reduce duplicated code by unifying BPF_ALU | BPF_MOD | BPF_X and BPF_ALU | BPF_DIV | BPF_X CC: Alexei Starovoitov CC: Daniel Borkmann CC: Philippe Bergheaud Signed-off-by: Denis Kirjanov Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- arch/powerpc/net/bpf_jit_comp.c | 27 ++++++++------------------- 1 file changed, 8 insertions(+), 19 deletions(-) diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index d3fa80d04e6b..1ca125b9c226 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -181,6 +181,7 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, } break; case BPF_ALU | BPF_MOD | BPF_X: /* A %= X; */ + case BPF_ALU | BPF_DIV | BPF_X: /* A /= X; */ ctx->seen |= SEEN_XREG; PPC_CMPWI(r_X, 0); if (ctx->pc_ret0 != -1) { @@ -190,9 +191,13 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, PPC_LI(r_ret, 0); PPC_JMP(exit_addr); } - PPC_DIVWU(r_scratch1, r_A, r_X); - PPC_MUL(r_scratch1, r_X, r_scratch1); - PPC_SUB(r_A, r_A, r_scratch1); + if (code == (BPF_ALU | BPF_MOD | BPF_X)) { + PPC_DIVWU(r_scratch1, r_A, r_X); + PPC_MUL(r_scratch1, r_X, r_scratch1); + PPC_SUB(r_A, r_A, r_scratch1); + } else { + PPC_DIVWU(r_A, r_A, r_X); + } break; case BPF_ALU | BPF_MOD | BPF_K: /* A %= K; */ PPC_LI32(r_scratch2, K); @@ -200,22 +205,6 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, PPC_MUL(r_scratch1, r_scratch2, r_scratch1); PPC_SUB(r_A, r_A, r_scratch1); break; - case BPF_ALU | BPF_DIV | BPF_X: /* A /= X; */ - ctx->seen |= SEEN_XREG; - PPC_CMPWI(r_X, 0); - if (ctx->pc_ret0 != -1) { - PPC_BCC(COND_EQ, addrs[ctx->pc_ret0]); - } else { - /* - * Exit, returning 0; first pass hits here - * (longer worst-case code size). - */ - PPC_BCC_SHORT(COND_NE, (ctx->idx*4)+12); - PPC_LI(r_ret, 0); - PPC_JMP(exit_addr); - } - PPC_DIVWU(r_A, r_A, r_X); - break; case BPF_ALU | BPF_DIV | BPF_K: /* A /= K */ if (K == 1) break; -- 2.20.1