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Jakub Ciolek b7c9cdd53c cmd/compile: establish limits of bool to uint8 conversions 
Improves bound check elimination for:

func arrayLargeEnough(b bool, a [2]int64) int64 {
    c := byte(0)
    if b {
        c = 1
    }

    // this bound check gets elided
    return a[c]
}

We also detect never true branches like:

func cCanOnlyBe0or1(b bool) byte {
    var c byte
    if b {
        c = 1
    }
    // this statement can never be true so we can elide it
    if c == 2 {
        c = 3
    }

    return c
}

Hits a few times:

crypto/internal/sysrand
crypto/internal/sysrand.Read 357 -> 349  (-2.24%)

testing
testing.(*F).Fuzz.func1.1 837 -> 828  (-1.08%)

image/png
image/png.(*Encoder).Encode 1735 -> 1733  (-0.12%)

vendor/golang.org/x/crypto/cryptobyte
vendor/golang.org/x/crypto/cryptobyte.(*Builder).callContinuation 187 -> 185  (-1.07%)

crypto/internal/sysrand [cmd/compile]
crypto/internal/sysrand.Read 357 -> 349  (-2.24%)

go/parser
go/parser.(*parser).parseType 463 -> 457  (-1.30%)
go/parser.(*parser).embeddedElem 633 -> 626  (-1.11%)
go/parser.(*parser).parseFuncDecl 917 -> 914  (-0.33%)
go/parser.(*parser).parseDotsType 393 -> 391  (-0.51%)
go/parser.(*parser).error 1061 -> 1054  (-0.66%)
go/parser.(*parser).parseTypeName 537 -> 532  (-0.93%)
go/parser.(*parser).parseParamDecl 1478 -> 1451  (-1.83%)
go/parser.(*parser).parseFuncTypeOrLit 498 -> 495  (-0.60%)
go/parser.(*parser).parseValue 375 -> 371  (-1.07%)
go/parser.(*parser).parseElementList 594 -> 593  (-0.17%)
go/parser.(*parser).parseResult 593 -> 583  (-1.69%)
go/parser.(*parser).parseElement 506 -> 504  (-0.40%)
go/parser.(*parser).parseImportSpec 1110 -> 1108  (-0.18%)
go/parser.(*parser).parseStructType 741 -> 735  (-0.81%)
go/parser.(*parser).parseTypeSpec 1054 -> 1048  (-0.57%)
go/parser.(*parser).parseIdentList 625 -> 623  (-0.32%)
go/parser.(*parser).parseOperand 1221 -> 1199  (-1.80%)
go/parser.(*parser).parseIndexOrSliceOrInstance 2713 -> 2694  (-0.70%)
go/parser.(*parser).parseSwitchStmt 1458 -> 1447  (-0.75%)
go/parser.(*parser).parseArrayFieldOrTypeInstance 1865 -> 1861  (-0.21%)
go/parser.(*parser).parseExpr 307 -> 305  (-0.65%)
go/parser.(*parser).parseSelector 427 -> 425  (-0.47%)
go/parser.(*parser).parseTypeInstance 1433 -> 1420  (-0.91%)
go/parser.(*parser).parseCaseClause 629 -> 626  (-0.48%)
go/parser.(*parser).parseParameterList 4212 -> 4189  (-0.55%)
go/parser.(*parser).parsePointerType 393 -> 391  (-0.51%)
go/parser.(*parser).parseFuncType 465 -> 463  (-0.43%)
go/parser.(*parser).parseTypeAssertion 559 -> 557  (-0.36%)
go/parser.(*parser).parseSimpleStmt 2443 -> 2388  (-2.25%)
go/parser.(*parser).parseCallOrConversion 1093 -> 1087  (-0.55%)
go/parser.(*parser).parseForStmt 2168 -> 2159  (-0.42%)
go/parser.(*parser).embeddedTerm 657 -> 649  (-1.22%)
go/parser.(*parser).parseCommClause 1509 -> 1501  (-0.53%)

cmd/internal/objfile
cmd/internal/objfile.(*goobjFile).symbols 5299 -> 5274  (-0.47%)

net
net.initConfVal 378 -> 374  (-1.06%)
net.(*conf).hostLookupOrder 269 -> 267  (-0.74%)
net.(*conf).addrLookupOrder 261 -> 255  (-2.30%)

cmd/internal/obj/loong64
cmd/internal/obj/loong64.(*ctxt0).oplook 1829 -> 1813  (-0.87%)

cmd/internal/obj/mips
cmd/internal/obj/mips.(*ctxt0).oplook 1428 -> 1400  (-1.96%)

go/types
go/types.(*typeWriter).signature 605 -> 601  (-0.66%)
go/types.(*Checker).instantiateSignature 1469 -> 1467  (-0.14%)

go/parser [cmd/compile]
go/parser.(*parser).parseSwitchStmt 1458 -> 1447  (-0.75%)
go/parser.(*parser).parseDotsType 393 -> 391  (-0.51%)
go/parser.(*parser).embeddedElem 633 -> 626  (-1.11%)
go/parser.(*parser).parseTypeAssertion 559 -> 557  (-0.36%)
go/parser.(*parser).parseCommClause 1509 -> 1501  (-0.53%)
go/parser.(*parser).parseCaseClause 629 -> 626  (-0.48%)
go/parser.(*parser).parseImportSpec 1110 -> 1108  (-0.18%)
go/parser.(*parser).parseTypeSpec 1054 -> 1048  (-0.57%)
go/parser.(*parser).parseElementList 594 -> 593  (-0.17%)
go/parser.(*parser).parseParamDecl 1478 -> 1451  (-1.83%)
go/parser.(*parser).parseType 463 -> 457  (-1.30%)
go/parser.(*parser).parseSimpleStmt 2443 -> 2388  (-2.25%)
go/parser.(*parser).parseIdentList 625 -> 623  (-0.32%)
go/parser.(*parser).parseTypeInstance 1433 -> 1420  (-0.91%)
go/parser.(*parser).parseResult 593 -> 583  (-1.69%)
go/parser.(*parser).parseValue 375 -> 371  (-1.07%)
go/parser.(*parser).parseFuncDecl 917 -> 914  (-0.33%)
go/parser.(*parser).error 1061 -> 1054  (-0.66%)
go/parser.(*parser).parseElement 506 -> 504  (-0.40%)
go/parser.(*parser).parseFuncType 465 -> 463  (-0.43%)
go/parser.(*parser).parsePointerType 393 -> 391  (-0.51%)
go/parser.(*parser).parseTypeName 537 -> 532  (-0.93%)
go/parser.(*parser).parseExpr 307 -> 305  (-0.65%)
go/parser.(*parser).parseFuncTypeOrLit 498 -> 495  (-0.60%)
go/parser.(*parser).parseStructType 741 -> 735  (-0.81%)
go/parser.(*parser).parseOperand 1221 -> 1199  (-1.80%)
go/parser.(*parser).parseIndexOrSliceOrInstance 2713 -> 2694  (-0.70%)
go/parser.(*parser).parseForStmt 2168 -> 2159  (-0.42%)
go/parser.(*parser).parseParameterList 4212 -> 4189  (-0.55%)
go/parser.(*parser).parseArrayFieldOrTypeInstance 1865 -> 1861  (-0.21%)
go/parser.(*parser).parseSelector 427 -> 425  (-0.47%)
go/parser.(*parser).parseCallOrConversion 1093 -> 1087  (-0.55%)
go/parser.(*parser).embeddedTerm 657 -> 649  (-1.22%)

crypto/tls
crypto/tls.(*Conn).clientHandshake 3430 -> 3421  (-0.26%)

cmd/internal/obj/mips [cmd/compile]
cmd/internal/obj/mips.(*ctxt0).oplook 1428 -> 1400  (-1.96%)

cmd/internal/obj/loong64 [cmd/compile]
cmd/internal/obj/loong64.(*ctxt0).oplook 1829 -> 1813  (-0.87%)

cmd/compile/internal/types2
cmd/compile/internal/types2.(*typeWriter).signature 605 -> 601  (-0.66%)
cmd/compile/internal/types2.(*Checker).infer 10646 -> 10614  (-0.30%)
cmd/compile/internal/types2.(*Checker).instantiateSignature 1567 -> 1561  (-0.38%)

cmd/compile/internal/types2 [cmd/compile]
cmd/compile/internal/types2.(*Checker).instantiateSignature 1567 -> 1561  (-0.38%)
cmd/compile/internal/types2.(*typeWriter).signature 605 -> 601  (-0.66%)
cmd/compile/internal/types2.(*Checker).infer 10718 -> 10654  (-0.60%)

cmd/vendor/golang.org/x/arch/s390x/s390xasm
cmd/vendor/golang.org/x/arch/s390x/s390xasm.GoSyntax 36778 -> 36682  (-0.26%)

net/http
net/http.(*Client).do 4202 -> 4170  (-0.76%)
net/http.(*http2clientStream).writeRequest 3692 -> 3686  (-0.16%)

cmd/vendor/github.com/ianlancetaylor/demangle
cmd/vendor/github.com/ianlancetaylor/demangle.(*rustState).genericArgs 466 -> 463  (-0.64%)

cmd/compile/internal/devirtualize
cmd/compile/internal/devirtualize.ProfileGuided.func1 1364 -> 1357  (-0.51%)

cmd/compile/internal/inline/interleaved
cmd/compile/internal/inline/interleaved.DevirtualizeAndInlinePackage.func2 533 -> 526  (-1.31%)

cmd/compile/internal/devirtualize [cmd/compile]
cmd/compile/internal/devirtualize.ProfileGuided.func1 1343 -> 1332  (-0.82%)

cmd/compile/internal/inline/interleaved [cmd/compile]
cmd/compile/internal/inline/interleaved.DevirtualizeAndInlinePackage.func2 533 -> 526  (-1.31%)

cmd/link/internal/ld
cmd/link/internal/ld.mustLinkExternal 2739 -> 2674  (-2.37%)

cmd/compile/internal/ssa
cmd/compile/internal/ssa.(*poset).Ordered 391 -> 389  (-0.51%)
cmd/compile/internal/ssa.(*poset).Equal 318 -> 313  (-1.57%)
cmd/compile/internal/ssa.(*poset).Undo 1842 -> 1832  (-0.54%)
cmd/compile/internal/ssa.(*expandState).decomposeAsNecessary 4587 -> 4555  (-0.70%)
cmd/compile/internal/ssa.(*poset).OrderedOrEqual 390 -> 389  (-0.26%)
cmd/compile/internal/ssa.(*poset).NonEqual 613 -> 606  (-1.14%)

cmd/compile/internal/ssa [cmd/compile]
cmd/compile/internal/ssa.(*poset).OrderedOrEqual 368 -> 365  (-0.82%)
cmd/compile/internal/ssa.(*poset).Equal 318 -> 313  (-1.57%)
cmd/compile/internal/ssa.(*expandState).decomposeAsNecessary 4952 -> 4938  (-0.28%)
cmd/compile/internal/ssa.(*poset).NonEqual 613 -> 606  (-1.14%)
cmd/compile/internal/ssa.(*poset).SetEqual 2533 -> 2505  (-1.11%)
cmd/compile/internal/ssa.(*poset).SetNonEqual 785 -> 777  (-1.02%)
cmd/compile/internal/ssa.(*poset).Ordered 370 -> 366  (-1.08%)

cmd/compile/internal/gc [cmd/compile]
cmd/compile/internal/gc.Main.DevirtualizeAndInlinePackage.func2 492 -> 489  (-0.61%)

file                                                    before   after    Δ       %
crypto/internal/sysrand.s                               1553     1545     -8      -0.515%
internal/zstd.s                                         49179    49190    +11     +0.022%
testing.s                                               115197   115188   -9      -0.008%
image/png.s                                             36109    36107    -2      -0.006%
vendor/golang.org/x/crypto/cryptobyte.s                 30980    30978    -2      -0.006%
crypto/internal/sysrand [cmd/compile].s                 1553     1545     -8      -0.515%
go/parser.s                                             112638   112354   -284    -0.252%
cmd/internal/objfile.s                                  49994    49969    -25     -0.050%
net.s                                                   299558   299546   -12     -0.004%
cmd/internal/obj/loong64.s                              71651    71635    -16     -0.022%
cmd/internal/obj/mips.s                                 59681    59653    -28     -0.047%
go/types.s                                              558839   558833   -6      -0.001%
cmd/compile/internal/types.s                            71305    71306    +1      +0.001%
go/parser [cmd/compile].s                               112749   112465   -284    -0.252%
crypto/tls.s                                            388859   388850   -9      -0.002%
cmd/internal/obj/mips [cmd/compile].s                   59792    59764    -28     -0.047%
cmd/internal/obj/loong64 [cmd/compile].s                71762    71746    -16     -0.022%
cmd/compile/internal/types2.s                           540608   540566   -42     -0.008%
cmd/compile/internal/types2 [cmd/compile].s             577428   577354   -74     -0.013%
cmd/vendor/golang.org/x/arch/s390x/s390xasm.s           267664   267568   -96     -0.036%
net/http.s                                              620704   620666   -38     -0.006%
cmd/vendor/github.com/ianlancetaylor/demangle.s         299991   299988   -3      -0.001%
cmd/compile/internal/devirtualize.s                     21452    21445    -7      -0.033%
cmd/compile/internal/inline/interleaved.s               8358     8351     -7      -0.084%
cmd/compile/internal/devirtualize [cmd/compile].s       20994    20983    -11     -0.052%
cmd/compile/internal/inline/interleaved [cmd/compile].s 8328     8321     -7      -0.084%
cmd/link/internal/ld.s                                  641802   641737   -65     -0.010%
cmd/compile/internal/ssa.s                              3552939  3552957  +18     +0.001%
cmd/compile/internal/ssa [cmd/compile].s                3752191  3752197  +6      +0.000%
cmd/compile/internal/ssagen.s                           405780   405786   +6      +0.001%
cmd/compile/internal/ssagen [cmd/compile].s             434472   434496   +24     +0.006%
cmd/compile/internal/gc [cmd/compile].s                 38499    38496    -3      -0.008%
total                                                   36185267 36184243 -1024   -0.003%

Change-Id: I867222b0f907b29d32b2676e55c6b5789ec56511
Reviewed-on: https://go-review.googlesource.com/c/go/+/642716
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
 		2025-02-05 09:04:25 -08:00
..
abi test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
alias3.dir
…
arenas reflect: fix ArenaNew to match documentation 2023-06-16 17:08:43 +00:00
asmhdr.dir
…
chan
…
closure3.dir cmd/compile: use very high budget for once-called closures 2024-11-22 02:04:41 +00:00
closure5.dir
…
codegen cmd/compile: do not treat OpLocalAddr as load in DSE 2025-02-04 12:52:01 -08:00
ddd2.dir
…
dwarf
…
fixedbugs test/issue71226: add cast to avoid clang error 2025-02-03 10:14:38 -08:00
import2.dir
…
import4.dir
…
interface
…
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
…
linkname.dir
…
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
…
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 cmd/compile: export/import materialized aliases 2024-04-05 16:29:58 +00:00
uintptrescapes.dir
…
wasmmemsize.dir test: add a test for wasm memory usage 2024-10-28 13:27:58 +00:00
64bit.go
…
235.go
…
README.md internal/testdir: move to cmd/internal/testdir 2023-05-12 17:18:08 +00:00
alg.go
…
alias.go
…
alias1.go
…
alias2.go go/types, types2: qualify named types in error messages with type kind 2024-10-23 04:43:01 +00:00
alias3.go
…
align.go
…
append.go
…
append1.go
…
args.go
…
armimm.go
…
asmhdr.go
…
assign.go sync: add explicit noCopy fields to Map, Mutex, and Once 2024-11-18 18:52:54 +00:00
assign1.go
…
atomicload.go
…
bigalg.go
…
bigmap.go
…
blank.go
…
blank1.go
…
bom.go
…
bombad.go
…
bounds.go
…
cannotassign.go
…
chancap.go
…
chanlinear.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
char_lit.go
…
char_lit1.go
…
checkbce.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
clear.go
…
clearfat.go
…
closedchan.go
…
closure.go
…
closure1.go
…
closure2.go
…
closure3.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
closure4.go
…
closure5.go
…
closure6.go
…
closure7.go
…
cmp.go
…
cmp6.go
…
cmplx.go
…
cmplxdivide.c
…
cmplxdivide.go
…
cmplxdivide1.go
…
complit.go
…
complit1.go
…
compos.go
…
const.go
…
const1.go
…
const2.go
…
const3.go
…
const4.go
…
const5.go
…
const6.go
…
const7.go
…
const8.go
…
convT2X.go
…
convert.go
…
convert1.go
…
convert2.go
…
convert3.go
…
convert4.go
…
convinline.go
…
convlit.go
…
convlit1.go
…
copy.go
…
copy1.go
…
crlf.go
…
ddd.go
…
ddd1.go
…
ddd2.go
…
decl.go
…
declbad.go
…
defer.go
…
defererrcheck.go test: add open-coded defer tests for too many exits path 2024-07-29 14:30:07 +00:00
deferfin.go
…
defernil.go
…
deferprint.go
…
deferprint.out
…
devirt.go
…
directive.go
…
directive2.go
…
divide.go
…
divmod.go
…
embedfunc.go
…
embedvers.go
…
empty.go
…
env.go test,internal/testdir: don't set GOOS/GOARCH 2023-05-12 12:34:59 +00:00
eof.go
…
eof1.go
…
escape.go
…
escape2.go all: remove newline characters after return statements 2023-12-14 17:22:18 +00:00
escape2n.go all: remove newline characters after return statements 2023-12-14 17:22:18 +00:00
escape3.go
…
escape4.go cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure" 2024-07-22 21:27:37 +00:00
escape5.go cmd/compile/internal/noder: stop preserving original const strings 2023-09-08 18:50:24 +00:00
escape_array.go
…
escape_calls.go cmd/compile: fix escape analysis of string min/max 2023-12-05 22:06:07 +00:00
escape_closure.go cmd/compile: retire "IsHiddenClosure" and "IsDeadcodeClosure" 2024-07-22 21:27:37 +00:00
escape_field.go
…
escape_goto.go
…
escape_hash_maphash.go
…
escape_iface.go test: remove *_unified.go variants 2023-05-23 17:16:35 +00:00
escape_indir.go
…
escape_level.go
…
escape_map.go
…
escape_mutations.go cmd/compile: restore zero-copy string->[]byte optimization 2023-08-18 11:58:37 +00:00
escape_param.go
…
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
…
escape_slice.go cmd/compile/internal/noder: stop preserving original const strings 2023-09-08 18:50:24 +00:00
escape_struct_param1.go
…
escape_struct_param2.go
…
escape_struct_return.go
…
escape_sync_atomic.go
…
escape_unsafe.go
…
fibo.go
…
finprofiled.go test: ignore MemProfileRecords with no live objects in finprofiled.go 2023-11-16 05:48:00 +00:00
float_lit.go
…
float_lit2.go
…
float_lit3.go
…
floatcmp.go
…
for.go test: add test cases for index value with range array clear 2023-07-10 16:36:41 +00:00
func.go
…
func1.go
…
func2.go
…
func3.go go/parser, syntax: better error message for parameter missing type 2024-09-30 22:04:40 +00:00
func4.go
…
func5.go
…
func6.go
…
func7.go
…
func8.go
…
funcdup.go
…
funcdup2.go
…
fuse.go cmd/compile: handle boolean and pointer relations 2024-08-07 16:07:55 +00:00
gc.go
…
gc1.go
…
gc2.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
gcgort.go
…
gcstring.go
…
goprint.go
…
goprint.out
…
goto.go
…
heapsampling.go
…
helloworld.go
…
helloworld.out
…
if.go
…
import.go
…
import1.go
…
import2.go
…
import4.go
…
import5.go
…
import6.go
…
index.go
…
index0.go
…
index1.go
…
index2.go
…
indirect.go
…
indirect1.go
…
init.go
…
init1.go
…
initcomma.go
…
initexp.go
…
initialize.go
…
initializerr.go
…
initloop.go go/types: improve recursive type error message 2024-10-22 22:20:29 +00:00
inline.go cmd/compile: add "deadlocals" pass to remove unused locals 2024-07-30 15:46:27 +00:00
inline_big.go cmd/compile: restore zero-copy string->[]byte optimization 2023-08-18 11:58:37 +00:00
inline_caller.go
…
inline_callers.go
…
inline_endian.go
…
inline_literal.go
…
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.Uint32 in Once 2023-10-06 21:01:50 +00:00
inline_testingbloop.go cmd/compile,testing: implement one-time rampup logic for testing.B.Loop 2024-11-20 23:19:48 +00:00
inline_variadic.go
…
int_lit.go
…
intcvt.go
…
intrinsic.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
intrinsic_atomic.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
iota.go
…
label.go
…
label1.go
…
linkmain.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
linkmain_run.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
linkname.go
…
linkname3.go cmd/compile: disallow linkname referring to instantiations 2024-05-15 19:27:25 +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.go
…
linkx_run.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
literal.go
…
literal2.go
…
live.go runtime: rename mapiterinit and mapiternext 2025-01-28 10:54:43 -08:00
live1.go
…
live2.go cmd/compile,internal/runtime/maps: add extendible hashing 2024-10-21 14:16:20 +00:00
live_regabi.go runtime: rename mapiterinit and mapiternext 2025-01-28 10:54:43 -08:00
live_uintptrkeepalive.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
loopbce.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
mainsig.go
…
makechan.go all: fix some comments 2024-04-04 14:29:45 +00:00
makemap.go
…
makenew.go
…
makeslice.go
…
mallocfin.go
…
map.go
…
map1.go
…
mapclear.go
…
maplinear.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
maymorestack.go
…
mergemul.go
…
method.go
…
method1.go
…
method2.go
…
method3.go
…
method4.go
…
method5.go
…
method6.go
…
method7.go
…
named.go
…
named1.go
…
newinline.go cmd/compile: add "deadlocals" pass to remove unused locals 2024-07-30 15:46:27 +00:00
nil.go
…
nilcheck.go
…
nilptr.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr2.go
…
nilptr3.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr4.go
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nilptr5.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr5_aix.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr5_wasm.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
nilptr_aix.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
noinit.go cmd/compile: reenable inline static init 2023-04-14 17:57:36 +00:00
nosplit.go cmd/internal/objabi, internal/runtime: increase nosplit limit on OpenBSD 2024-12-06 00:35:41 +00:00
nowritebarrier.go cmd/compile: redo IsRuntimePkg/IsReflectPkg predicate 2023-08-22 19:18:21 +00:00
nul1.go
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opt_branchlikely.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
parentype.go
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peano.go
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phiopt.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
print.go
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print.out
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printbig.go
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printbig.out
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prove.go cmd/compile: establish limits of bool to uint8 conversions 2025-02-05 09:04:25 -08:00
prove_constant_folding.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
prove_invert_loop_with_unused_iterators.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
range.go
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range2.go all: rename GOEXPERIMENT=range to rangefunc 2023-11-08 15:32:14 +00:00
range3.go cmd/compile: fix typecheck range over rune literal 2023-12-01 17:20:08 +00:00
range4.go cmd/compile: handle defined iter func type correctly 2024-01-08 16:00:53 +00:00
rangegen.go test: skip rangegen.go on 32-bit platforms 2023-12-18 23:35:19 +00:00
recover.go
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recover1.go
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recover2.go
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recover3.go
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recover4.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
recover5.go
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reflectmethod1.go
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reflectmethod2.go
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reflectmethod3.go
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reflectmethod4.go
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reflectmethod5.go
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reflectmethod6.go
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reflectmethod7.go
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reflectmethod8.go
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rename.go
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rename1.go cmd/compile/internal/types2: only mark variables as used if they are 2023-04-19 14:07:00 +00:00
reorder.go
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reorder2.go
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retjmp.go
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return.go
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rotate.go
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rotate0.go
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rotate1.go
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rotate2.go
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rotate3.go
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rune.go
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runtime.go
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shift1.go
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shift2.go
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shift3.go
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sieve.go
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sigchld.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
sigchld.out
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simassign.go
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sizeof.go
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slice3.go
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slice3err.go
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slicecap.go
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sliceopt.go
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solitaire.go
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stack.go
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stackobj.go
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stackobj2.go
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stackobj3.go
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strcopy.go
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strength.go
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string_lit.go
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stringrange.go
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struct0.go
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switch.go
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switch2.go cmd/compile: better error message when offending/missing token is a keyword 2024-11-14 02:14:13 +00:00
switch3.go
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switch4.go
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switch5.go
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switch6.go
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switch7.go
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tailcall.go cmd/compile: emit tail call wrappers when possible 2024-09-09 20:20:10 +00:00
tighten.go cmd/compile: enhance tighten pass for memory values 2023-05-16 01:01:38 +00:00
tinyfin.go
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torture.go
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turing.go
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typecheck.go
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typecheckloop.go
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typeswitch.go
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typeswitch1.go
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typeswitch2.go
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typeswitch2b.go
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typeswitch3.go
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uintptrescapes.go
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uintptrescapes2.go
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uintptrescapes3.go
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uintptrkeepalive.go
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undef.go
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unsafe_slice_data.go
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unsafe_string.go
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unsafe_string_data.go
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unsafebuiltins.go
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used.go
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utf.go
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varerr.go
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varinit.go
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wasmexport.go cmd/compile: add basic wasmexport support 2024-08-09 20:07:54 +00:00
wasmexport2.go cmd/compile: allow more types for wasmimport/wasmexport parameters and results 2024-11-11 17:11:50 +00:00
wasmmemsize.go test: add a test for wasm memory usage 2024-10-28 13:27:58 +00:00
winbatch.go
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writebarrier.go
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zerodivide.go
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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.