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00263a8968
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David Chase 00263a8968 cmd/compile: reduce debugger-worsening line number churn 
Reuse block head or preceding instruction's line number for
register allocator's spill, fill, copy, rematerialization
instructionsl; and also for phi, and for no-src-pos
instructions.  Assembler creates same line number tables
for copy-predecessor-line and for no-src-pos,
but copy-predecessor produces better-looking assembly
language output with -S and with GOSSAFUNC, and does not
require changes to tests of existing assembly language.

Split "copyInto" into two cases, one for register allocation,
one for otherwise.  This caused the test score line change
count to increase by one, which may reflect legitimately
useful information preserved.  Without any special treatment
for copyInto, the change count increases by 21 more, from
51 to 72 (i.e., quite a lot).

There is a test; using two naive "scores" for line number
churn, the old numbering is 2x or 4x worse.

Fixes #18902.

Change-Id: I0a0a69659d30ee4e5d10116a0dd2b8c5df8457b1
Reviewed-on: https://go-review.googlesource.com/36207
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2017-05-10 17:16:44 +00:00
.github doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
api api: update next.txt 2017-05-02 19:34:49 +00:00
doc spec: clarify unsafe.Pointer conversions 2017-05-09 18:35:13 +00:00
lib/time *.bash: always use the same string equality operator 2017-03-14 21:46:31 +00:00
misc cmd/internal/obj, cmd/link: fix st_other field on PPC64 2017-05-09 23:36:51 +00:00
src cmd/compile: reduce debugger-worsening line number churn 2017-05-10 17:16:44 +00:00
test cmd/compile: reduce debugger-worsening line number churn 2017-05-10 17:16:44 +00:00
.gitattributes
.gitignore .gitignore: change path to zbootstrap.go 2017-04-19 02:13:58 +00:00
AUTHORS A+C: automated update 2016-12-21 03:22:22 +00:00
CONTRIBUTING.md doc: improve issue template and contribution guidelines 2017-02-11 20:42:06 +00:00
CONTRIBUTORS A+C: automated update 2016-12-21 03:22:22 +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.

Gopher image Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.

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Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.

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To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html

Note that the Go project does not use GitHub pull requests, and that we use the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.