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Josh Bleecher Snyder a2bff7c296 cmd/compile: make pre-elimination of rulegen bounds checks more precise
In cases in which we had a named value whose args were all _,
like this rule from ARM.rules:

(MOVBUreg x:(MOVBUload _ _)) -> (MOVWreg x)

We previously inserted

_ = x.Args[1]

even though it is unnecessary.
This change eliminates this pointless bounds check.
And in other cases, we now check bounds just as far as strictly necessary.

No significant movement on any compiler metrics.
Just nicer (and less) code.

Passes toolstash-check -all.

Change-Id: I075dfe9f926cc561cdc705e9ddaab563164bed3a
Reviewed-on: https://go-review.googlesource.com/c/go/+/221781
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-03-02 17:40:11 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api sync: add new Map method LoadAndDelete 2020-02-25 14:31:55 +00:00
doc doc: race condition in unsynchronized send/close 2020-03-02 08:42:10 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc misc/wasm: avoid implicit boolean to number conversion 2020-02-25 21:08:47 +00:00
src cmd/compile: make pre-elimination of rulegen bounds checks more precise 2020-03-02 17:40:11 +00:00
test test: re-enable open-coded defer test on riscv64 2020-02-26 16:54:17 +00:00
.gitattributes
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS CONTRIBUTORS: second round of updates for Go 1.14 2020-02-21 19:59:34 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
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SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

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