From: Joe Perches <[email protected]> Date: Thu, 04 Dec 2014 15:00:48 -0800
> 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 <[email protected]> Applied. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
