From: zlim.lnx@gmail.com (Zi Shen Lim)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH net-next v2 3/4] arm64: bpf: optimize JMP_CALL
Date: Mon, 6 Jun 2016 22:22:58 -0700 [thread overview]
Message-ID: <1465276979-10147-4-git-send-email-zlim.lnx@gmail.com> (raw)
In-Reply-To: <1465276979-10147-1-git-send-email-zlim.lnx@gmail.com>
Remove superfluous stack frame, saving us 3 instructions for
every JMP_CALL.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
---
arch/arm64/net/bpf_jit_comp.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 51abc97..7ae304e 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -578,11 +578,8 @@ emit_cond_jmp:
const u64 func = (u64)__bpf_call_base + imm;
emit_a64_mov_i64(tmp, func, ctx);
- emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx);
- emit(A64_MOV(1, A64_FP, A64_SP), ctx);
emit(A64_BLR(tmp), ctx);
emit(A64_MOV(1, r0, A64_R(0)), ctx);
- emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx);
break;
}
/* tail call */
--
1.9.1
next prev parent reply other threads:[~2016-06-07 5:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 5:22 [PATCH net-next v2 0/4] arm64 BPF JIT updates Zi Shen Lim
2016-06-07 5:22 ` [PATCH net-next v2 1/4] bpf: fix missing header inclusion Zi Shen Lim
2016-06-07 5:22 ` Zi Shen Lim [this message]
2016-06-07 5:22 ` [PATCH net-next v2 4/4] arm64: bpf: optimize LD_ABS, LD_IND Zi Shen Lim
2016-06-08 7:30 ` [PATCH net-next v2 0/4] arm64 BPF JIT updates David Miller
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