• Vladimir Kuzmin's avatar
    cmd/compile: map delete should clear value always · b080abf6
    Vladimir Kuzmin authored
    Map delete must clear value every time because
    newly added map optimizations of compound-assignment
    operators (CL #91557) rely on this behavior of map delete.
    
    It slows down map delete operation for non-reference types:
    
    name                   old time/op    new time/op    delta
    MapDelete/Int32/100      23.9ns ± 2%    27.8ns ± 4%  +16.04%  (p=0.000 n=20+20)
    MapDelete/Int32/1000     21.5ns ± 2%    25.2ns ± 2%  +17.06%  (p=0.000 n=20+19)
    MapDelete/Int32/10000    24.2ns ± 6%    27.2ns ± 5%  +12.39%  (p=0.000 n=19+19)
    MapDelete/Int64/100      24.2ns ± 4%    27.7ns ± 2%  +14.55%  (p=0.000 n=20+20)
    MapDelete/Int64/1000     22.1ns ± 2%    24.8ns ± 2%  +12.36%  (p=0.000 n=10+20)
    
    Fixes #25936
    
    Change-Id: I8499b790cb5bb019938161b3e50f3243d9bbb79c
    Reviewed-on: https://go-review.googlesource.com/120255
    Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
    Reviewed-by: 's avatarKeith Randall <khr@golang.org>
    b080abf6
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