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Youlin Feng c7ccbddf22 cmd/compile/internal/ssa: more aggressive on dead auto elim 
Propagate "unread" across OpMoves. If the addr of this auto is only used
by an OpMove as its source arg, and the OpMove's target arg is the addr
of another auto. If the 2nd auto can be eliminated, this one can also be
eliminated.

This CL eliminates unnecessary memory copies and makes the frame smaller
in the following code snippet:

func contains(m map[string][16]int, k string) bool {
        _, ok := m[k]
        return ok
}

These are the benchmark results followed by the benchmark code:

goos: linux
goarch: amd64
cpu: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
                │   old.txt   │              new.txt                │
                │   sec/op    │   sec/op     vs base                │
Map1Access2Ok-8   9.582n ± 2%   9.226n ± 0%   -3.72% (p=0.000 n=20)
Map2Access2Ok-8   13.79n ± 1%   10.24n ± 1%  -25.77% (p=0.000 n=20)
Map3Access2Ok-8   68.68n ± 1%   12.65n ± 1%  -81.58% (p=0.000 n=20)

package main_test

import "testing"

var (
        m1 = map[int]int{}
        m2 = map[int][16]int{}
        m3 = map[int][256]int{}
)

func init() {
        for i := range 1000 {
                m1[i] = i
                m2[i] = [16]int{15:i}
                m3[i] = [256]int{255:i}
        }
}

func BenchmarkMap1Access2Ok(b *testing.B) {
        for i := range b.N {
                _, ok := m1[i%1000]
                if !ok {
                        b.Errorf("%d not found", i)
                }
        }
}

func BenchmarkMap2Access2Ok(b *testing.B) {
        for i := range b.N {
                _, ok := m2[i%1000]
                if !ok {
                        b.Errorf("%d not found", i)
                }
        }
}

func BenchmarkMap3Access2Ok(b *testing.B) {
        for i := range b.N {
                _, ok := m3[i%1000]
                if !ok {
                        b.Errorf("%d not found", i)
                }
        }
}

Fixes #75398

Change-Id: If75e9caaa50d460efc31a94565b9ba28c8158771
Reviewed-on: https://go-review.googlesource.com/c/go/+/702875
Reviewed-by: Keith Randall <khr@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
2025-11-04 12:46:15 -08:00
..
abi
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
alias3.dir
[dev.typealias] cmd/compile: export/import test cases for type aliases
2017-01-20 05:55:53 +00:00
arenas
reflect: fix ArenaNew to match documentation
2023-06-16 17:08:43 +00:00
asmhdr.dir
cmd/compile: use exact constant in go_asm.h
2022-01-10 21:27:19 +00:00
chan
[dev.typeparams] cmd/compile/internal/types2: implement close(ch) where ch is of type parameter type
2021-07-14 23:33:46 +00:00
closure3.dir
cmd/compile: use very high budget for once-called closures
2024-11-22 02:04:41 +00:00
closure5.dir
test: use dot-relative imports where appropriate
2022-03-24 02:14:15 +00:00
codegen
cmd/compile/internal/ssa: more aggressive on dead auto elim
2025-11-04 12:46:15 -08:00
ddd2.dir
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
dwarf
…
fixedbugs
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
import2.dir
…
import4.dir
go/types, types2: use "and not used" instead of "but not used" in error messages
2022-09-27 21:10:19 +00:00
interface
go/types, types2: more systematic use of Checker.use und useLHS
2023-03-28 14:28:33 +00:00
internal/runtime/sys
runtime: move getcallersp to internal/runtime/sys
2024-09-17 17:01:20 +00:00
intrinsic.dir
runtime,internal: move runtime/internal/sys to internal/runtime/sys
2024-07-23 19:05:35 +00:00
ken
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
linkname.dir
test: compile source files as if from "test" module
2022-03-24 17:50:47 +00:00
linknameasm.dir
cmd/compile: generate args_stackmap for ABI0 assembly func regardless of linkname
2024-06-07 15:22:22 +00:00
method4.dir
…
retjmp.dir
cmd/internal/obj: fix tail call in non-zero frame leaf function on MIPS and S390X
2021-12-13 22:42:08 +00:00
stress
test/stress: fix typo in comment
2024-03-25 19:21:35 +00:00
syntax
cmd/compile: better error message when offending/missing token is a keyword
2024-11-14 02:14:13 +00:00
typeparam
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
uintptrescapes.dir
…
wasmmemsize.dir
internal/buildcfg: enable greenteagc experiment by default
2025-10-06 16:01:40 -07:00
64bit.go
cmd/gc: Error out on division by constant zero.
2013-01-30 20:21:08 +01:00
235.go
…
alg.go
test: add test that required algs get generated
2016-04-24 21:36:52 +00:00
alias1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
alias2.go
go/types, types2: qualify named types in error messages with type kind
2024-10-23 04:43:01 +00:00
alias3.go
[dev.typealias] cmd/compile: export/import test cases for type aliases
2017-01-20 05:55:53 +00:00
alias.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
align.go
test: check that unaligned load-add opcodes work.
2018-04-09 18:57:37 +00:00
append1.go
cmd/compile: use "cannot use %s as %s value in %s: %s" error message
2022-09-28 22:28:39 +00:00
append.go
cmd/compile: optimize append(x, make([]T, y)...) slice extension
2018-05-06 04:28:23 +00:00
args.go
test: run some more tests by default
2012-11-08 09:04:27 -08:00
armimm.go
…
asmhdr.go
cmd/compile: emit sensible go_asm.h consts for big ints
2021-10-30 18:30:05 +00:00
assign1.go
…
assign.go
sync: add explicit noCopy fields to Map, Mutex, and Once
2024-11-18 18:52:54 +00:00
atomicload.go
cmd/compile: keep value use counts in SSA
2016-03-17 04:20:02 +00:00
bigalg.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
bigmap.go
runtime: handle and test large map values
2012-05-24 22:41:07 -04:00
blank1.go
[dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams'
2020-12-14 12:13:36 -08:00
blank.go
test: revert changes made for Go SSA interpreter test.
2013-10-08 14:36:20 -04:00
bom.go
gc: initial BOM is legal.
2012-09-10 13:03:07 -07:00
bombad.go
…
bounds.go
cmd/compile: defer lowering OANDNOT until SSA
2020-10-27 03:11:45 +00:00
cannotassign.go
[dev.typeparams] test: add scaffolding to run.go to check compiler with -G flag
2020-12-01 21:49:31 +00:00
chancap.go
[dev.regabi] cmd/compile: remove toolstash scaffolding
2021-01-05 21:44:30 +00:00
chanlinear.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
char_lit1.go
cmd/compile: do not report error for invalid constant
2021-03-05 18:46:43 +00:00
char_lit.go
test: [a-c]: add introductory comments to tests
2012-02-19 13:19:43 +11:00
checkbce.go
cmd/compile: make prove understand div, mod better
2025-10-29 18:49:40 -07:00
clear.go
cmd/compile: add clear(x) builtin
2023-01-31 19:43:07 +00:00
clearfat.go
…
closedchan.go
test: use testlib (first 100)
2012-02-16 23:48:57 -05:00
closure1.go
cmd/gc: capture variables by value
2015-01-29 13:07:30 +00:00
closure2.go
cmd/compile: experimental loop iterator capture semantics change
2023-03-06 18:34:24 +00:00
closure3.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
closure4.go
…
closure5.go
[dev.regabi] cmd/compile: exporting, importing, and inlining functions with OCLOSURE
2021-01-20 22:53:32 +00:00
closure6.go
[dev.regabi] cmd/compile: fix escape analysis problem with closures
2021-01-23 02:15:24 +00:00
closure7.go
[dev.regabi] test: add a test for inlining closures
2021-02-01 18:28:05 +00:00
closure.go
test: enforce 1 proc in the test
2012-07-01 21:59:50 +04:00
cmp6.go
[dev.typeparams] test: add scaffolding to run.go to check compiler with -G flag
2020-12-01 21:49:31 +00:00
cmp.go
Fix several out of date references to 4g/5g/6g/8g/9g.
2015-06-26 03:38:21 +00:00
cmplx.go
cmd/compile: rewrite f(g()) for multi-value g() during typecheck
2019-03-14 21:00:20 +00:00
cmplxdivide1.go
runtime: make complex division c99 compatible
2017-03-15 22:45:17 +00:00
cmplxdivide.c
runtime: make complex division c99 compatible
2017-03-15 22:45:17 +00:00
cmplxdivide.go
runtime: make complex division c99 compatible
2017-03-15 22:45:17 +00:00
complit1.go
go/types, types2: report better error messages for slice expressions
2025-03-11 05:44:15 -07:00
complit.go
test: [a-c]: add introductory comments to tests
2012-02-19 13:19:43 +11:00
compos.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
const1.go
[dev.typeparams] test: add scaffolding to run.go to check compiler with -G flag
2020-12-01 21:49:31 +00:00
const2.go
[dev.typeparams] test: add scaffolding to run.go to check compiler with -G flag
2020-12-01 21:49:31 +00:00
const3.go
test: [a-c]: add introductory comments to tests
2012-02-19 13:19:43 +11:00
const4.go
all: link to https instead of http
2015-07-11 14:36:33 +00:00
const5.go
all: link to https instead of http
2015-07-11 14:36:33 +00:00
const6.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
const7.go
all: add wasip1 support
2023-04-11 20:56:32 +00:00
const8.go
test: add more tests for const decls with ommitted RHS expressions
2022-06-28 18:11:31 +00:00
const.go
cmd/compile: apply constant folding to ORUNESTR
2019-09-26 23:54:29 +00:00
convert1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
convert2.go
go/types, types2: implement slice-to-array conversions
2022-09-08 15:55:44 +00:00
convert3.go
test: [a-c]: add introductory comments to tests
2012-02-19 13:19:43 +11:00
convert4.go
cmd/compile: implement slice-to-array conversions
2022-09-19 18:58:26 +00:00
convert5.go
cmd/compile: disable use of new saturating float-to-int conversions
2025-10-14 15:09:35 -07:00
convert5.out
cmd/compile: modify float-to-[u]int so that amd64 and arm64 match
2025-10-09 08:23:21 -07:00
convert.go
test: [a-c]: add introductory comments to tests
2012-02-19 13:19:43 +11:00
convinline.go
cmd/compile: handle integer conversions in static init inliner
2022-11-17 13:46:05 +00:00
convlit1.go
…
convlit.go
cmd/compile/internal/types2: refactor untyped conversions
2021-03-23 05:11:09 +00:00
convT2X.go
…
copy1.go
go/types, types2: better error messages for copy built-in
2025-03-10 21:30:51 -07:00
copy.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
crlf.go
…
ddd1.go
cmd/compile: use "cannot use %s as %s value in %s: %s" error message
2022-09-28 22:28:39 +00:00
ddd2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
ddd.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
decl.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
declbad.go
cmd/compile: rewrite a, b = f() to use temporaries when type not identical
2021-06-14 07:12:37 +00:00
defer.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
defererrcheck.go
test: add open-coded defer tests for too many exits path
2024-07-29 14:30:07 +00:00
deferfin.go
[dev.regabi] test: enable finalizer tests on !amd64
2021-01-05 21:11:31 +00:00
defernil.go
cmd/compile: on Wasm and AIX, let deferred nil function panic at invocation
2019-10-16 00:05:37 +00:00
deferprint.go
…
deferprint.out
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
devirt.go
[dev.typeparams] cmd/compile: simplify interface conversions
2021-08-09 16:10:20 +00:00
devirtualization_nil_panics.go
cmd/compile/internal/devirtualize: improve concrete type analysis
2025-10-08 14:09:22 -07:00
devirtualization_with_type_assertions_interleaved.go
cmd/compile/internal/devirtualize: improve concrete type analysis
2025-10-08 14:09:22 -07:00
devirtualization.go
cmd/compile/internal/devirtualize: fix OCONVNOP assertion
2025-10-14 09:33:37 -07:00
directive2.go
cmd/compile: restrict //go:notinheap to runtime/internal/sys
2022-09-02 06:22:23 +00:00
directive.go
cmd/compile: restrict //go:notinheap to runtime/internal/sys
2022-09-02 06:22:23 +00:00
divide.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
divmod.go
…
embedfunc.go
cmd/compile: require 'go 1.16' go.mod line for //go:embed
2021-01-19 20:07:52 +00:00
embedvers.go
cmd/compile: require 'go 1.16' go.mod line for //go:embed
2021-01-19 20:07:52 +00:00
empty.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
env.go
test,internal/testdir: don't set GOOS/GOARCH
2023-05-12 12:34:59 +00:00
eof1.go
…
eof.go
…
escape2.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
escape2n.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
escape3.go
…
escape4.go
cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure"
2024-07-22 21:27:37 +00:00
escape5.go
cmd/compile/internal/escape: propagate constants to interface conversions to avoid allocs
2025-05-21 12:02:43 -07:00
escape6.go
cmd/compile: allow pointer-containing elements in stack allocations
2025-04-04 15:04:34 -07:00
escape_array.go
cmd/compile: determine static values of len and cap in make() calls
2025-02-19 13:38:58 -08:00
escape_calls.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
escape_closure.go
cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure"
2024-07-22 21:27:37 +00:00
escape_field.go
cmd/compile: use clearer error message for stuct literal
2020-09-12 08:31:49 +00:00
escape_goto.go
[dev.typeparams] test: rename blank functions
2021-07-28 21:41:07 +00:00
escape_hash_maphash.go
hash/maphash: mark call into runtime hash function as not escaping
2019-11-16 20:31:45 +00:00
escape_iface_data.go
cmd/compile/internal/walk: use global zeroVal in interface conversions for zero values
2025-05-21 12:24:22 -07:00
escape_iface.go
cmd/compile/internal/escape: propagate constants to interface conversions to avoid allocs
2025-05-21 12:02:43 -07:00
escape_indir.go
cmd/compile: use clearer error message for stuct literal
2020-09-12 08:31:49 +00:00
escape_level.go
cmd/compile: silence esc diagnostics about directiface OCONVIFACEs
2019-09-03 17:52:06 +00:00
escape_make_non_const.go
cmd/compile: propagate len([]T{}) to make builtin to allow stack allocation
2025-10-02 11:02:07 -07:00
escape_map.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
escape_mutations.go
cmd/compile: restore zero-copy string->[]byte optimization
2023-08-18 11:58:37 +00:00
escape_param.go
[dev.typeparams] cmd/compile: simplify ~r/~b naming
2021-05-26 23:50:32 +00:00
escape_reflect.go
reflect: remove calling mapiterkey, mapiterelem
2024-09-18 20:57:20 +00:00
escape_runtime_atomic.go
runtime: migrate internal/atomic to internal/runtime
2024-03-25 19:53:03 +00:00
escape_selfassign.go
test: add regress test cases for self-assignment
2019-04-17 16:36:56 +00:00
escape_slice.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
escape_struct_param1.go
cmd/compile: use clearer error message for stuct literal
2020-09-12 08:31:49 +00:00
escape_struct_param2.go
cmd/compile: use clearer error message for stuct literal
2020-09-12 08:31:49 +00:00
escape_struct_return.go
[dev.typeparams] cmd/compile: simplify ~r/~b naming
2021-05-26 23:50:32 +00:00
escape_sync_atomic.go
runtime/internal/atomic: remove bad go:noescape annotations on Loadp
2019-04-17 19:09:15 +00:00
escape_unique.go
cmd/compile, unique: model data flow of non-string pointers
2025-05-21 20:07:36 -07:00
escape_unsafe.go
test: fix typo in escape_unsafe.go
2022-09-07 17:25:59 +00:00
escape.go
cmd/compile: experimental loop iterator capture semantics change
2023-03-06 18:34:24 +00:00
fibo.go
Fix whitespace (use blanks consistently).
2014-12-08 22:22:58 +00:00
finprofiled.go
test: ignore MemProfileRecords with no live objects in finprofiled.go
2023-11-16 05:48:00 +00:00
float_lit2.go
test/float_lit2: fix expressions in comment
2016-09-14 16:39:47 +00:00
float_lit3.go
test: re-enable a bunch of tests with types2
2021-12-03 16:24:32 +00:00
float_lit.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
floatcmp.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
for.go
test: add test cases for index value with range array clear
2023-07-10 16:36:41 +00:00
func1.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
func2.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
func3.go
go/parser, syntax: better error message for parameter missing type
2024-09-30 22:04:40 +00:00
func4.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
func5.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
func6.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
func7.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
func8.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
func.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
funcdup2.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
funcdup.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
fuse.go
cmd/compile: handle boolean and pointer relations
2024-08-07 16:07:55 +00:00
gc1.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
gc2.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
gc.go
test: explanatory comments [c-g]*
2012-02-19 14:28:53 +11:00
gcgort.go
…
gcstring.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
goprint.go
test: adjust a test to work with js/wasm's background goroutine
2019-10-10 19:38:06 +00:00
goprint.out
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
goto.go
cmd/compile: report block start for gotos jumping into blocks
2017-04-19 02:27:58 +00:00
heapsampling.go
cmd/compile: call generated size-specialized malloc functions directly
2025-10-09 14:59:40 -07:00
helloworld.go
test: remove rundircmpout and cmpout actions
2018-05-31 17:36:45 +00:00
helloworld.out
test: split golden.out into expected output per test
2012-01-18 16:12:24 -08:00
if.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
import1.go
go/types, types2: use "and not used" instead of "but not used" in error messages
2022-09-27 21:10:19 +00:00
import2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
import4.go
test: convert more tests to rundir/compiledir conventions
2012-10-07 23:22:01 +02:00
import5.go
cmd/compile: be slightly more tolerant in case of certain syntax errors
2017-03-24 20:07:15 +00:00
import6.go
test: re-enable most go/tests that were disabled because of types2 differences
2022-01-11 02:26:58 +00:00
import.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
index0.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
index1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
index2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
index.go
all: fix typos
2019-09-08 17:28:20 +00:00
indirect1.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
indirect.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
init1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
init.go
[dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams'
2020-12-14 12:13:36 -08:00
initcomma.go
test/initcomma.go: restore what it's supposed to be testing
2012-02-20 07:44:24 +11:00
initexp.go
cmd/compile: use "init... cycle" instead of "init... loop" in error messages
2022-09-23 20:27:09 +00:00
initialize.go
cmd/compile: handle simple inlined calls in staticinit
2022-11-16 04:04:52 +00:00
initializerr.go
test: re-enable most go/tests that were disabled because of types2 differences
2022-01-11 02:26:58 +00:00
initloop.go
go/types: improve recursive type error message
2024-10-22 22:20:29 +00:00
inline_big.go
cmd/compile: restore zero-copy string->[]byte optimization
2023-08-18 11:58:37 +00:00
inline_caller.go
runtime: make FuncForPC return the innermost inlined frame
2019-01-08 21:54:04 +00:00
inline_callers.go
runtime: make FuncForPC return the innermost inlined frame
2019-01-08 21:54:04 +00:00
inline_endian.go
cmd/compile: allocate backing store for append on the stack
2025-05-19 16:14:53 -07:00
inline_literal.go
cmd/compile: copy literals when inlining
2017-03-03 21:29:32 +00:00
inline_math_bits_rotate.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
inline_sync.go
sync: use atomic.Bool for Once.done
2025-04-22 08:28:13 -07:00
inline_testingbloop.go
testing: detect a stopped timer in B.Loop
2025-03-24 11:41:09 -07:00
inline_variadic.go
[dev.typeparams] cmd/compile: simplify inlining variadic calls
2021-05-26 23:50:45 +00:00
inline.go
cmd/compile: remove no-longer-necessary recursive inlining checks
2025-03-06 10:07:17 -08:00
int_lit.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
intcvt.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
intrinsic_atomic.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
intrinsic.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
iota.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
label1.go
test: match gofrontend error messages
2020-11-28 02:31:54 +00:00
label.go
test: match gofrontend error messages
2020-11-28 02:31:54 +00:00
linkmain_run.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
linkmain.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
linkname3.go
cmd/compile: disallow linkname referring to instantiations
2024-05-15 19:27:25 +00:00
linkname.go
test: remove -newescape from regress tests
2019-08-28 19:27:20 +00:00
linknameasm.go
cmd/compile: generate args_stackmap for ABI0 assembly func regardless of linkname
2024-06-07 15:22:22 +00:00
linkobj.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
linkx_run.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
linkx.go
[dev.link] all: clean up some TODOs
2019-11-01 20:13:05 +00:00
literal2.go
cmd/compile: accept 'i' suffix orthogonally on all numbers
2019-02-19 22:45:09 +00:00
literal.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
live1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
live2.go
all: remove GOEXPERIMENT=swissmap
2025-07-30 11:47:14 -07:00
live_regabi.go
cmd/compile: call generated size-specialized malloc functions directly
2025-10-09 14:59:40 -07:00
live_uintptrkeepalive.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
live.go
cmd/compile: call generated size-specialized malloc functions directly
2025-10-09 14:59:40 -07:00
loopbce.go
cmd/compile: improve slicemask removal
2025-10-03 12:31:36 -07:00
mainsig.go
[dev.regabi] cmd/compile: cleanup for concrete types - noder
2020-12-17 04:43:46 +00:00
makechan.go
all: fix some comments
2024-04-04 14:29:45 +00:00
makemap.go
cmd/compile/internal/types2: add unsafe.Add and unsafe.Slice
2021-04-23 00:41:01 +00:00
makenew.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
makeslice.go
cmd/compile: optimize make+copy pattern to avoid memclr
2020-05-07 17:50:24 +00:00
mallocfin.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
map1.go
[dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams'
2020-12-14 12:13:36 -08:00
map.go
test/mapnan.go: add regression test for non-empty interfaces.
2014-08-06 17:02:55 -04:00
mapclear.go
cmd/compile: optimize map-clearing range idiom
2018-05-08 21:15:16 +00:00
maplinear.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
maymorestack.go
cmd/{asm,compile,internal/obj}: add "maymorestack" support
2021-11-05 00:52:06 +00:00
mergemul.go
cmd/compile: combine x*n - y*n into (x-y)*n
2017-09-03 14:29:38 +00:00
method1.go
cmd/compile: use "method T.m already declared" for method redeclaration errors
2022-09-27 21:59:19 +00:00
method2.go
go/types, types2: better error message when using *interface instead of interface
2022-01-10 22:48:40 +00:00
method3.go
test: commentary for [h-m]*.go
2012-02-23 18:47:26 +11:00
method4.go
test: convert more tests to rundir/compiledir conventions
2012-10-07 23:22:01 +02:00
method5.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
method6.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
method7.go
[dev.typeparams] cmd/compile: fix MethodExpr handling with embedded fields
2021-01-26 17:05:06 +00:00
method.go
test: a number of fixes.
2013-02-11 18:20:52 -05:00
named1.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
named.go
…
newexpr.go
cmd/compile: fix ICE with new(<untyped expr>)
2025-09-26 10:10:03 -07:00
newinline.go
cmd/compile: remove no-longer-necessary recursive inlining checks
2025-03-06 10:07:17 -08:00
nil.go
test: ensure all failing tests exit nonzero.
2013-02-12 13:17:49 -05:00
nilcheck.go
[dev.unified] test: tweak nilcheck test
2022-06-30 18:41:59 +00:00
nilptr2.go
test: use a real use function in nilptr2.go
2019-05-11 03:02:33 +00:00
nilptr3.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
nilptr4.go
…
nilptr5_aix.go
cmd/compile: duplicate nil check to two branches of write barrier
2025-09-19 07:13:32 -07:00
nilptr5_wasm.go
cmd/compile: duplicate nil check to two branches of write barrier
2025-09-19 07:13:32 -07:00
nilptr5.go
cmd/compile: duplicate nil check to two branches of write barrier
2025-09-19 07:13:32 -07:00
nilptr_aix.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
nilptr.go
cmd/link: use >4GB base address for 64-bit PE binaries
2025-05-12 11:05:28 -07:00
noinit.go
cmd/compile: reenable inline static init
2023-04-14 17:57:36 +00:00
nosplit.go
Revert "cmd/compile: redo arm64 LR/FP save and restore"
2025-10-07 08:21:14 -07:00
nowritebarrier.go
cmd/compile: redo IsRuntimePkg/IsReflectPkg predicate
2023-08-22 19:18:21 +00:00
nul1.go
cmd/compile/internal/gc: enable new parser by default
2016-10-25 22:28:40 +00:00
opt_branchlikely.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
parentype.go
test/[n-r]*.go: add documentation
2012-02-24 10:30:39 +11:00
peano.go
all: skip unsupported tests for js/wasm
2018-04-30 19:39:18 +00:00
phiopt.go
cmd/compile: add 2 phiopt cases
2025-05-08 10:18:37 -07:00
print.go
…
print.out
runtime: use internal/strconv
2025-10-29 11:00:23 -07:00
printbig.go
…
printbig.out
…
prove_constant_folding.go
cmd/compile/internal/ssa: model right shift more precisely
2025-10-30 09:17:59 -07:00
prove_invert_loop_with_unused_iterators.go
cmd/compile: make prove understand div, mod better
2025-10-29 18:49:40 -07:00
prove_popcount.go
cmd/compile: compute bits.OnesCount's limits from argument's limits
2025-03-11 20:17:36 -07:00
prove.go
cmd/compile/internal/ssa: model right shift more precisely
2025-10-30 09:17:59 -07:00
range2.go
internal/goexperiment: delete RangeFunc goexperiment
2025-07-29 12:44:58 -07:00
range3.go
cmd/compile: fix typecheck range over rune literal
2023-12-01 17:20:08 +00:00
range4.go
internal/goexperiment: delete RangeFunc goexperiment
2025-07-29 12:44:58 -07:00
range.go
cmd/compile: improve single blank variable handling in walkrange
2017-09-12 05:50:54 +00:00
rangegen.go
internal/goexperiment: delete RangeFunc goexperiment
2025-07-29 12:44:58 -07:00
README.md
internal/testdir: move to cmd/internal/testdir
2023-05-12 17:18:08 +00:00
recover1.go
…
recover2.go
cmd/compile,runtime: generate hash functions only for types which are map keys
2019-09-03 20:41:29 +00:00
recover3.go
…
recover4.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
recover5.go
…
recover.go
…
reflectmethod1.go
cmd/compile: track reflect.Type.Method in deadcode
2016-03-11 21:19:20 +00:00
reflectmethod2.go
cmd/compile: track reflect.Type.Method in deadcode
2016-03-11 21:19:20 +00:00
reflectmethod3.go
cmd/compile: track reflect.Type.Method in deadcode
2016-03-11 21:19:20 +00:00
reflectmethod4.go
cmd/link: treat reflect.Value.Method like Call
2016-03-11 22:07:02 +00:00
reflectmethod5.go
cmd/compile: when marking REFLECTMETHOD, check for reflect package itself
2020-04-19 03:12:32 +00:00
reflectmethod6.go
cmd/compile: when marking REFLECTMETHOD, check for reflect package itself
2020-04-19 03:12:32 +00:00
reflectmethod7.go
all: use reflect.{Pointer,PointerTo}
2021-10-26 14:24:17 +00:00
reflectmethod8.go
[dev.typeparams] cmd/compile: fix missing condition in usemethod
2021-07-22 17:48:41 +00:00
rename1.go
cmd/compile/internal/types2: only mark variables as used if they are
2023-04-19 14:07:00 +00:00
rename.go
…
reorder2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
reorder.go
[dev.regabi] cmd/compile: cleanup OAS2FUNC ordering
2021-01-16 23:19:26 +00:00
retjmp.go
…
return.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rotate0.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rotate1.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rotate2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rotate3.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rotate.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
rune.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
runtime.go
[dev.typeparams] cmd/compile/internal/types2: adjusted qualified identifier error message for compiler
2020-12-09 23:56:19 +00:00
shift1.go
test: re-enable a bunch of tests with types2
2021-12-03 16:24:32 +00:00
shift2.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
shift3.go
cmd/compile: adjust types2 shift check to match go/types (cleanup)
2022-04-07 17:19:55 +00:00
sieve.go
test/[n-z]*.go: add documentation
2012-02-24 11:48:19 +11:00
sigchld.go
test: migrate remaining files to go:build syntax
2023-10-19 23:33:25 +00:00
sigchld.out
…
simassign.go
…
sizeof.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
slice3.go
…
slice3err.go
[dev.typeparams] test: finish triaging all outstanding failing tests
2020-12-14 21:28:48 +00:00
slicecap.go
…
sliceopt.go
cmd/compile: make prove pass use unsatisfiability
2018-03-08 22:25:25 +00:00
solitaire.go
test/[n-z]*.go: add documentation
2012-02-24 11:48:19 +11:00
stack.go
…
stackobj2.go
…
stackobj3.go
…
stackobj.go
…
strcopy.go
test: add test to verify that string copies don't get optimized away
2018-06-12 19:10:34 +00:00
strength.go
all: fix typos
2019-09-08 17:28:20 +00:00
string_lit.go
…
stringrange.go
…
struct0.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
switch2.go
cmd/compile: better error message when offending/missing token is a keyword
2024-11-14 02:14:13 +00:00
switch3.go
[dev.typeparams] cmd/compile/internal/types2: report error for invalid (but empty) expr switch
2020-12-15 19:43:32 +00:00
switch4.go
…
switch5.go
[dev.typeparams] test: finish triaging all outstanding failing tests
2020-12-14 21:28:48 +00:00
switch6.go
cmd/compile: use "missing method m" instead of "missing m method"
2022-09-24 17:04:15 +00:00
switch7.go
[dev.typeparams] test: finish triaging all outstanding failing tests
2020-12-14 21:28:48 +00:00
switch.go
[dev.unified] test: add switch test case for tricky nil handling
2022-07-19 23:30:49 +00:00
tailcall.go
Revert "cmd/compile: Enable inlining of tail calls"
2025-06-04 08:27:44 -07:00
tighten.go
cmd/compile: pair loads and stores on arm64
2025-02-13 14:07:47 -08:00
tinyfin.go
runtime: fix finalization and profiling of tiny allocations
2015-11-03 18:57:18 +00:00
torture.go
…
turing.go
test/[n-z]*.go: add documentation
2012-02-24 11:48:19 +11:00
typecheck.go
test: re-enable most go/tests that were disabled because of types2 differences
2022-01-11 02:26:58 +00:00
typecheckloop.go
cmd/compile: use "init... cycle" instead of "init... loop" in error messages
2022-09-23 20:27:09 +00:00
typeswitch1.go
…
typeswitch2.go
cmd/compile: move duplicate type-case checking into typecheck
2019-09-11 23:33:11 +00:00
typeswitch2b.go
go/types, types2: use "and not used" instead of "but not used" in error messages
2022-09-27 21:10:19 +00:00
typeswitch3.go
cmd/compile/internal/types2: better error for type assertion/switch on type parameter value
2021-11-12 22:20:51 +00:00
typeswitch.go
…
uintptrescapes2.go
cmd/compile: call generated size-specialized malloc functions directly
2025-10-09 14:59:40 -07:00
uintptrescapes3.go
cmd/compile: fix //go:uintptrescapes for basic method calls
2019-11-05 00:26:30 +00:00
uintptrescapes.go
cmd/compile, syscall: add //go:uintptrescapes comment, and use it
2016-07-06 20:48:41 +00:00
uintptrkeepalive.go
cmd/compile: add //go:uintptrkeepalive
2022-04-21 18:06:38 +00:00
undef.go
all: make copyright headers consistent with one space after period
2016-05-02 13:43:18 +00:00
unsafe_slice_data.go
cmd/compile: add support for unsafe.{String,StringData,SliceData}
2022-08-31 17:15:15 +00:00
unsafe_string_data.go
cmd/compile: add support for unsafe.{String,StringData,SliceData}
2022-08-31 17:15:15 +00:00
unsafe_string.go
cmd/compile: add support for unsafe.{String,StringData,SliceData}
2022-08-31 17:15:15 +00:00
unsafebuiltins.go
cmd/compile: add support for unsafe.{String,StringData,SliceData}
2022-08-31 17:15:15 +00:00
used.go
cmd/compile/internal: support new(expr)
2025-09-23 13:12:12 -07:00
utf.go
test/[n-z]*.go: add documentation
2012-02-24 11:48:19 +11:00
varerr.go
[dev.typeparams] test: enable some more errorcheck tests
2020-12-04 21:22:23 +00:00
varinit.go
test/[n-z]*.go: add documentation
2012-02-24 11:48:19 +11:00
wasmexport2.go
cmd/compile: allow more types for wasmimport/wasmexport parameters and results
2024-11-11 17:11:50 +00:00
wasmexport.go
cmd/compile: add basic wasmexport support
2024-08-09 20:07:54 +00:00
wasmmemsize.go
test: add a test for wasm memory usage
2024-10-28 13:27:58 +00:00
weak.go
weak: prevent unsafe conversions using weak pointers
2025-02-06 13:16:59 -08:00
winbatch.go
all: update to use filepath.WalkDir instead of filepath.Walk
2020-12-02 16:33:57 +00:00
writebarrier.go
cmd/compile: don't emit write barriers for offsets of global addresses
2021-08-23 19:46:36 +00:00
zerodivide.go
all: use bytes.Cut, strings.Cut
2021-10-06 15:53:04 +00:00
zerosize.go
cmd/link: put zero-sized data symbols at same address as runtime.zerobase
2023-04-28 18:35:43 +00:00

README.md

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 test cmd/internal/testdir

To run just tests from specified files in this directory, execute:

../bin/go test cmd/internal/testdir -run='Test/(file1.go|file2.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.
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