]> git.baikalelectronics.ru Git - kernel.git/commit
projects / kernel.git / commit
? search:
summary | shortlog | log | commit | commitdiff | tree
(parent: f076b36) | patch
bpf, x64: save several bytes when mul dest is r0/r3 anyway
authorDaniel Borkmann <daniel@iogearbox.net>
Sat, 24 Feb 2018 00:08:00 +0000 (01:08 +0100)
committerAlexei Starovoitov <ast@kernel.org>
Sat, 24 Feb 2018 06:50:00 +0000 (22:50 -0800)
commit6e1eef2a7d8c76d67469e5fdb5d007eca61f3993
tree3d168b1decd203600c39c67ba730eabb7178e829tree | snapshot
parentf076b36677cdfa3628cc4491f041975b7d7c5b60commit | diff
bpf, x64: save several bytes when mul dest is r0/r3 anyway

Instead of unconditionally performing push/pop on rax/rdx
in case of multiplication, we can save a few bytes in case
of dest register being either BPF r0 (rax) or r3 (rdx)
since the result is written in there anyway.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
arch/x86/net/bpf_jit_comp.c diff | blob | history
Linux Kernel Source Tree.