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Josh Bleecher Snyder 4ad643d208 cmd/compile: remove loop in shortcircuit 
shortcircuitBlock contained a loop to handle blocks like

b: <- p q
  v = Phi true false
If v -> t u

in a single execution.
This change makes shortcircuitBlock do it in two instead,
one for each constant phi arg.

Motivation: Upcoming changes will expand the range of
blocks that the shortcircuit pass can handle.
Those changes need to understand what the CFG
will look like after the rewrite in shortcircuitBlock.
Making shortcircuitBlock do only a single CFG
modification at a time significantly simplifies that code.

In theory, this is less efficient, but not measurably so.
There is minor, unimportant churn in the generated code.

Updates #37608

Change-Id: Ia6dce7011e3e19b546ed1e176bd407575a0ab837
Reviewed-on: https://go-review.googlesource.com/c/go/+/222918
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2020-03-13 19:42:14 +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/go1.14: document that unparsable URL in net/url.Error is now quoted 2020-03-06 14:41:22 +00:00
lib/time lib/time: update tz data to 2019c 2019-11-26 12:03:08 +00:00
misc misc/spectre: add spectre index test 2020-03-13 19:06:00 +00:00
src cmd/compile: remove loop in shortcircuit 2020-03-13 19:42:14 +00:00
test cmd/asm, cmd/compile, runtime: add -spectre=ret mode 2020-03-13 19:05:54 +00:00
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.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
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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