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    • Keith Randall's avatar
      runtime: amd64, use 4-byte ops for memmove of 4 bytes · a96e117a
      Keith Randall authored
      memmove used to use 2 2-byte load/store pairs to move 4 bytes.
      When the result is loaded with a single 4-byte load, it caused
      a store to load fowarding stall.  To avoid the stall,
      special case memmove to use 4 byte ops for the 4 byte copy case.
      
      We already have a special case for 8-byte copies.
      386 already specializes 4-byte copies.
      I'll do 2-byte copies also, but not for 1.8.
      
      benchmark                 old ns/op     new ns/op     delta
      BenchmarkIssue18740-8     7567          4799          -36.58%
      
      3-byte copies get a bit slower.  Other copies are unchanged.
      name         old time/op   new time/op   delta
      Memmove/3-8   4.76ns ± 5%   5.26ns ± 3%  +10.50%  (p=0.000 n=10+10)
      
      Fixes #18740
      
      Change-Id: Iec82cbac0ecfee80fa3c8fc83828f9a1819c3c74
      Reviewed-on: https://go-review.googlesource.com/35567
      Run-TryBot: Keith Randall <khr@golang.org>
      TryBot-Result: Gobot Gobot <gobot@golang.org>
      Reviewed-by: default avatarDavid Chase <drchase@google.com>
      a96e117a
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