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test/codegen: mention -all_codegen in the README

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For performance reasons (avoiding costly cross-compilations) CL 177577
changed the codegen test harness to only run the tests for the
machine's GOARCH by default.

This change updates the codegen README accordingly, explaining what
all.bash does run by default and how to perform the tests for all
architectures.

Fixes #33924

Change-Id: I43328d878c3e449ebfda46f7e69963a44a511d40
Reviewed-on: https://go-review.googlesource.com/c/go/+/192619
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
This commit is contained in:
Alberto Donizetti 2019-09-01 17:30:56 +02:00 committed by Daniel Martí
parent c51909e3a5
commit e6d2544d20
1 changed files with 12 additions and 8 deletions
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20
test/codegen/README
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@ -9,17 +9,20 @@ compiler.
- Introduction - Introduction
The test harness compiles Go code inside files in this directory and The test harness compiles Go code inside files in this directory and
then matches the generated assembly (the output of `go tool compile -S`) matches the generated assembly (the output of `go tool compile -S`)
against a set of regexps specified in comments that follow a special against a set of regexps to be specified in comments that follow a
syntax (described below). The test driver is implemented as a step of special syntax (described below). The test driver is implemented as a
the top-level test/run.go suite, called "asmcheck". step of the top-level test/run.go suite, called "asmcheck".
The codegen tests run during all.bash, but can also be run in The codegen harness is part of the all.bash test suite, but for
isolation by using performance reasons only the codegen tests for the host machine's
GOARCH are enabled by default. To perform comprehensive tests for all
the supported architectures, one can run the following command
$ ../bin/go run run.go -v codegen $ ../bin/go run run.go -all_codegen -v codegen
in the top-level test directory. in the top-level test directory. This is recommended after any change
that affect the compiler's code.
The test harness compiles the tests with the same go toolchain that is The test harness compiles the tests with the same go toolchain that is
used to run run.go. After writing tests for a newly added codegen used to run run.go. After writing tests for a newly added codegen
@ -94,6 +97,7 @@ For example:
verifies that NO memmove call is present in the assembly generated for verifies that NO memmove call is present in the assembly generated for
the copy() line. the copy() line.
- Architecture specifiers - Architecture specifiers
There are three different ways to specify on which architecture a test There are three different ways to specify on which architecture a test