ff51353c38
The nanotime wrappers in runtime introduce a bunch of unnecessary code onto hot paths, e.g.: 0000000000449d70 <time.runtimeNano>: 449d70: 64 48 8b 0c 25 f8 ff mov %fs:0xfffffffffffffff8,%rcx 449d77: ff ff 449d79: 48 3b 61 10 cmp 0x10(%rcx),%rsp 449d7d: 76 26 jbe 449da5 <time.runtimeNano+0x35> 449d7f: 48 83 ec 10 sub $0x10,%rsp 449d83: 48 89 6c 24 08 mov %rbp,0x8(%rsp) 449d88: 48 8d 6c 24 08 lea 0x8(%rsp),%rbp 449d8d: e8 ae 18 01 00 callq 45b640 <runtime.nanotime> 449d92: 48 8b 04 24 mov (%rsp),%rax 449d96: 48 89 44 24 18 mov %rax,0x18(%rsp) 449d9b: 48 8b 6c 24 08 mov 0x8(%rsp),%rbp 449da0: 48 83 c4 10 add $0x10,%rsp 449da4: c3 retq 449da5: e8 56 e0 00 00 callq 457e00 <runtime.morestack_noctxt> 449daa: eb c4 jmp 449d70 <time.runtimeNano> Move them to the corresponding packages which eliminates all of this. name old time/op new time/op delta TCP4OneShotTimeout-6 17.1µs ± 1% 17.0µs ± 0% -0.66% (p=0.032 n=5+5) SetReadDeadline-6 234ns ± 1% 232ns ± 0% -0.77% (p=0.016 n=5+4) Update #25729 Change-Id: Iee05027adcdc289ba895c5f5a37f154e451bc862 Reviewed-on: https://go-review.googlesource.com/c/146342 Run-TryBot: Dmitry Vyukov <dvyukov@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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