Michael Munday 6ec4c71eef cmd/compile: add SSA rules for s390x compare-and-branch instructions
This commit adds SSA rules for the s390x combined compare-and-branch
instructions. These have a shorter encoding than separate compare
and branch instructions and they also don't clobber the condition
code (a.k.a. flag register) reducing pressure on the flag allocator.

I have deleted the 'loop_test.go' file and replaced it with a new
codegen test which performs a wider range of checks.

Object sizes from compilebench:

name                      old object-bytes  new object-bytes  delta
Template                        562kB ± 0%        561kB ± 0%   -0.28%  (p=0.000 n=10+10)
Unicode                         217kB ± 0%        217kB ± 0%   -0.17%  (p=0.000 n=10+10)
GoTypes                        2.03MB ± 0%       2.02MB ± 0%   -0.59%  (p=0.000 n=10+10)
Compiler                       8.16MB ± 0%       8.11MB ± 0%   -0.62%  (p=0.000 n=10+10)
SSA                            27.4MB ± 0%       27.0MB ± 0%   -1.45%  (p=0.000 n=10+10)
Flate                           356kB ± 0%        356kB ± 0%   -0.12%  (p=0.000 n=10+10)
GoParser                        438kB ± 0%        436kB ± 0%   -0.51%  (p=0.000 n=10+10)
Reflect                        1.37MB ± 0%       1.37MB ± 0%   -0.42%  (p=0.000 n=10+10)
Tar                             485kB ± 0%        483kB ± 0%   -0.39%  (p=0.000 n=10+10)
XML                             630kB ± 0%        621kB ± 0%   -1.45%  (p=0.000 n=10+10)
[Geo mean]                     1.14MB            1.13MB        -0.60%

name                      old text-bytes    new text-bytes    delta
HelloSize                       763kB ± 0%        754kB ± 0%   -1.30%  (p=0.000 n=10+10)
CmdGoSize                      10.7MB ± 0%       10.6MB ± 0%   -0.91%  (p=0.000 n=10+10)
[Geo mean]                     2.86MB            2.82MB        -1.10%

Change-Id: Ibca55d9c0aa1254aee69433731ab5d26a43a7c18
Reviewed-on: https://go-review.googlesource.com/c/go/+/198037
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
2019-10-08 10:03:04 +00:00
..
2019-03-06 18:53:12 +00:00
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The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go run run.go

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.