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Date: Wed, 13 Aug 2014 08:52:30 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Alexei Starovoitov' <ast@...mgrid.com>, "David S. Miller" <davem@...emloft.net> CC: Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Steven Rostedt <rostedt@...dmis.org>, Daniel Borkmann <dborkman@...hat.com>, Chema Gonzalez <chema@...gle.com>, Eric Dumazet <edumazet@...gle.com>, "Peter Zijlstra" <a.p.zijlstra@...llo.nl>, "H. Peter Anvin" <hpa@...or.com>, "Andrew Morton" <akpm@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: RE: [PATCH RFC v4 net-next 00/26] BPF syscall, maps, verifier, samples, llvm From: Of Alexei Starovoitov > one more RFC... > > Major difference vs previous set is a new 'load 64-bit immediate' eBPF insn. > Which is first 16-byte instruction. It shows how eBPF ISA can be extended > while maintaining backward compatibility, but mainly it cleans up eBPF > program access to maps and improves run-time performance. Wouldn't it be more sensible to follow the scheme used by a lot of cpus and add a 'load high' instruction (follow with 'add' or 'or'). It still takes 16 bytes to load a 64bit immediate value, but the instruction size remains constant. There is nothing to stop any JIT software detecting the instruction pair. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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