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b080abf656
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Vladimir Kuzmin b080abf656 cmd/compile: map delete should clear value always 
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: Keith Randall <khr@golang.org>
2018-06-26 01:57:01 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api os: have UserCacheDir return an error on failure 2018-06-25 18:59:39 +00:00
doc doc/go1.11: add note about package versioning 2018-06-25 18:17:49 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc syscall.js: add Value.InstanceOf 2018-06-25 17:03:20 +00:00
src cmd/compile: map delete should clear value always 2018-06-26 01:57:01 +00:00
test cmd/compile: avoid remainder in loopbce when increment=0 2018-06-25 20:36:42 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
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LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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