path: root/tools
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authorRussell King <rmk+kernel@armlinux.org.uk>2019-12-09 11:17:30 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2019-12-11 14:34:26 +0100
commitc453312857ba41129db3558f5428405bbbb8f1a4 (patch)
tree10b7805bc7995c24515874aef85e65c7827c5cdc /tools
parentcxgb4: add support for high priority filters (diff)
ARM: net: bpf: Improve prologue code sequence
Improve the prologue code sequence to be able to take advantage of 64-bit stores, changing the code from: push {r4, r5, r6, r7, r8, r9, fp, lr} mov fp, sp sub ip, sp, #80 ; 0x50 sub sp, sp, #600 ; 0x258 str ip, [fp, #-100] ; 0xffffff9c mov r6, #0 str r6, [fp, #-96] ; 0xffffffa0 mov r4, #0 mov r3, r4 mov r2, r0 str r4, [fp, #-104] ; 0xffffff98 str r4, [fp, #-108] ; 0xffffff94 to the tighter: push {r4, r5, r6, r7, r8, r9, fp, lr} mov fp, sp mov r3, #0 sub r2, sp, #80 ; 0x50 sub sp, sp, #600 ; 0x258 strd r2, [fp, #-100] ; 0xffffff9c mov r2, #0 strd r2, [fp, #-108] ; 0xffffff94 mov r2, r0 resulting in a saving of three instructions. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/E1ieH2g-0004ih-Rb@rmk-PC.armlinux.org.uk
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