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| author | Joe Perches <joe@perches.com> | 2014-12-04 15:00:48 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-12-09 14:56:41 -0500 |
| commit | d148134be51fe05271ec8d47fe8c815bdee2b8e7 (patch) | |
| tree | 213553d693669b3c9bbbc3b821e3680db9b33910 /mm/page_alloc.c | |
| parent | 57d743a3dec174b8f1fbf53e93ade2fea3d32bd7 (diff) | |
| download | op-kernel-dev-d148134be51fe05271ec8d47fe8c815bdee2b8e7.zip op-kernel-dev-d148134be51fe05271ec8d47fe8c815bdee2b8e7.tar.gz | |
x86: bpf_jit_comp: Reduce is_ereg() code size
Use the (1 << reg) & mask trick to reduce code size.
x86-64 size difference -O2 without profiling for various
gcc versions:
$ size arch/x86/net/bpf_jit_comp.o*
text data bss dec hex filename
9266 4 0 9270 2436 arch/x86/net/bpf_jit_comp.o.4.4.new
10042 4 0 10046 273e arch/x86/net/bpf_jit_comp.o.4.4.old
9109 4 0 9113 2399 arch/x86/net/bpf_jit_comp.o.4.6.new
9717 4 0 9721 25f9 arch/x86/net/bpf_jit_comp.o.4.6.old
8789 4 0 8793 2259 arch/x86/net/bpf_jit_comp.o.4.7.new
10245 4 0 10249 2809 arch/x86/net/bpf_jit_comp.o.4.7.old
9671 4 0 9675 25cb arch/x86/net/bpf_jit_comp.o.4.9.new
10679 4 0 10683 29bb arch/x86/net/bpf_jit_comp.o.4.9.old
Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/page_alloc.c')
0 files changed, 0 insertions, 0 deletions
