diff options
| author |   Russell King <rmk+kernel@armlinux.org.uk> | 2018-07-11 10:32:17 +0100 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-07-12 20:45:23 +0200 |
| commit | 2b6958ef1151452cb2160fde75a5c5382b512c34 (patch) | |
| tree | 42ca3eed1a541f1ae1eb283f7cd36d6e122524e1 /arch/arm/net/bpf_jit_32.h | |
| parent | ARM: net: bpf: use immediate forms of instructions where possible (diff) | |
| download | linux-dev-2b6958ef1151452cb2160fde75a5c5382b512c34.tar.xz linux-dev-2b6958ef1151452cb2160fde75a5c5382b512c34.zip | |
ARM: net: bpf: use ldr instructions with shifted rm register
Rather than pre-shifting the rm register for the ldr in the tail call,
shift it in the load instruction. This eliminates one unnecessary
instruction.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to '')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/net/bpf_jit_32.h b/arch/arm/net/bpf_jit_32.h index dee8a76fb0bc..e541a7a6139a 100644 --- a/arch/arm/net/bpf_jit_32.h +++ b/arch/arm/net/bpf_jit_32.h @@ -188,6 +188,10 @@ #define ARM_LDR_R(rt, rn, rm) (ARM_INST_LDR_R | ARM_INST_LDST__U \ | (rt) << 12 | (rn) << 16 \ | (rm)) +#define ARM_LDR_R_SI(rt, rn, rm, type, imm) \ + (ARM_INST_LDR_R | ARM_INST_LDST__U \ + | (rt) << 12 | (rn) << 16 \ + | (imm) << 7 | (type) << 5 | (rm)) #define ARM_LDRB_R(rt, rn, rm) (ARM_INST_LDRB_R | ARM_INST_LDST__U \ | (rt) << 12 | (rn) << 16 \ | (rm)) |