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go/test
Jorropo bac4e2f241 cmd/compile: try to rewrite loops to count down
Fixes #61629

This reduce the pressure on regalloc because then the loop only keep alive
one value (the iterator) instead of the iterator and the upper bound since
the comparison now acts against an immediate, often zero which can be skipped.

This optimize things like:
  for i := 0; i < n; i++ {
Or a range over a slice where the index is not used:
  for _, v := range someSlice {
Or the new range over int from #61405:
  for range n {

It is hit in 975 unique places while doing ./make.bash.

Change-Id: I5facff8b267a0b60ea3c1b9a58c4d74cdb38f03f
Reviewed-on: https://go-review.googlesource.com/c/go/+/512935
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Jorropo <jorropo.pgm@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@golang.org>
2023-07-31 18:33:29 +00:00
..
abi
alias3.dir
arenas reflect: fix ArenaNew to match documentation 2023-06-16 17:08:43 +00:00
asmhdr.dir
chan
closure3.dir cmd/compile: incorporate inlined function names into closure naming 2023-05-22 22:47:15 +00:00
closure5.dir
codegen cmd/compile: try to rewrite loops to count down 2023-07-31 18:33:29 +00:00
ddd2.dir
dwarf
fixedbugs cmd/internal/obj: print relocation type by name in -S output 2023-07-20 19:42:11 +00:00
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
intrinsic.dir runtime: replace all uses of CtzXX with TrailingZerosXX 2022-10-18 18:06:27 +00:00
ken
linkname.dir
method4.dir
retjmp.dir
runtime
stress
syntax go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
typeparam go/types, types2: don't infer type argument for unused parameter in interfaces 2023-05-25 21:37:01 +00:00
uintptrescapes.dir
64bit.go
235.go
alg.go
alias1.go
alias2.go cmd/compile: use "cannot use %s as %s value in %s: %s" error message 2022-09-28 22:28:39 +00:00
alias3.go
alias.go
align.go
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
args.go
armimm.go
asmhdr.go
assign1.go
assign.go
atomicload.go
bigalg.go
bigmap.go
blank1.go
blank.go
bom.go
bombad.go
bounds.go
cannotassign.go
chancap.go
chanlinear.go
char_lit1.go
char_lit.go
checkbce.go Revert "cmd/compile: sparse conditional constant propagation" 2023-05-24 14:39:34 +00:00
clear.go cmd/compile: add clear(x) builtin 2023-01-31 19:43:07 +00:00
clearfat.go
closedchan.go
closure1.go
closure2.go cmd/compile: experimental loop iterator capture semantics change 2023-03-06 18:34:24 +00:00
closure3.go
closure4.go
closure5.go
closure6.go
closure7.go
closure.go
cmp6.go
cmp.go
cmplx.go
cmplxdivide1.go
cmplxdivide.c
cmplxdivide.go
complit1.go
complit.go
compos.go
const1.go
const2.go
const3.go
const4.go
const5.go
const6.go
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
convert1.go
convert2.go go/types, types2: implement slice-to-array conversions 2022-09-08 15:55:44 +00:00
convert3.go
convert4.go cmd/compile: implement slice-to-array conversions 2022-09-19 18:58:26 +00:00
convert.go
convinline.go cmd/compile: handle integer conversions in static init inliner 2022-11-17 13:46:05 +00:00
convlit1.go
convlit.go
convT2X.go
copy1.go
copy.go
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
ddd.go
decl.go
declbad.go
defer.go
defererrcheck.go
deferfin.go
defernil.go
deferprint.go
deferprint.out
devirt.go
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
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
eof1.go
eof.go
escape2.go
escape2n.go
escape3.go
escape4.go test: enable inlining tests for functions with local type 2023-01-31 20:36:55 +00:00
escape5.go
escape_array.go
escape_calls.go
escape_closure.go
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_param.go
escape_reflect.go test: add escape test for reflect.Value operations 2023-05-12 23:13:19 +00:00
escape_runtime_atomic.go
escape_selfassign.go
escape_slice.go cmd/compile: implement slice-to-array conversions 2022-09-19 18:58:26 +00:00
escape_struct_param1.go
escape_struct_param2.go
escape_struct_return.go
escape_sync_atomic.go
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
finprofiled.go
float_lit2.go
float_lit3.go
float_lit.go
floatcmp.go
for.go test: add test cases for index value with range array clear 2023-07-10 16:36:41 +00:00
func1.go
func2.go
func3.go
func4.go
func5.go
func6.go
func7.go
func8.go
func.go
funcdup2.go
funcdup.go
fuse.go
gc1.go
gc2.go
gc.go
gcgort.go
gcstring.go
goprint.go
goprint.out
goto.go
heapsampling.go test/heapsampling.go: slow down allocation rate and reduce iterations 2022-05-27 21:36:06 +00:00
helloworld.go
helloworld.out
if.go
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
import4.go
import5.go
import6.go
import.go
index0.go
index1.go
index2.go
index.go
indirect1.go
indirect.go
init1.go
init.go
initcomma.go
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
initloop.go
inline_big.go cmd/compile: flag 'large' functions when -m=2+ in effect 2023-01-24 13:28:54 +00:00
inline_caller.go
inline_callers.go
inline_endian.go cmd/compile: make encoding/binary appends cheaper to inline 2022-09-15 21:05:02 +00:00
inline_literal.go
inline_math_bits_rotate.go
inline_sync.go reflect: do not escape Value.Type 2023-05-12 21:11:51 +00:00
inline_variadic.go
inline.go test: remove *_unified.go variants 2023-05-23 17:16:35 +00:00
int_lit.go
intcvt.go
intrinsic_atomic.go misc, test: fix test error for loong64 2022-05-20 16:16:37 +00:00
intrinsic.go
iota.go
label1.go
label.go
linkmain_run.go all: add wasip1 support 2023-04-11 20:56:32 +00:00
linkmain.go
linkname3.go
linkname.go
linkobj.go all: add wasip1 support 2023-04-11 20:56:32 +00:00
linkx_run.go all: add wasip1 support 2023-04-11 20:56:32 +00:00
linkx.go
literal2.go
literal.go
live1.go
live2.go
live_regabi.go test: test that we schedule OpArgIntReg early 2023-01-21 21:08:30 +00:00
live_uintptrkeepalive.go all: add wasip1 support 2023-04-11 20:56:32 +00:00
live.go cmd/compile: sort liveness variable reports 2023-01-21 21:08:00 +00:00
loopbce.go Revert "cmd/compile: sparse conditional constant propagation" 2023-05-24 14:39:34 +00:00
mainsig.go
makechan.go
makemap.go
makenew.go
makeslice.go
mallocfin.go
map1.go
map.go
mapclear.go
maplinear.go
maymorestack.go
mergemul.go
method1.go cmd/compile: use "method T.m already declared" for method redeclaration errors 2022-09-27 21:59:19 +00:00
method2.go
method3.go
method4.go
method5.go
method6.go
method7.go
method.go
named1.go
named.go
nil.go
nilcheck.go [dev.unified] test: tweak nilcheck test 2022-06-30 18:41:59 +00:00
nilptr2.go
nilptr3.go cmd/compile: casts from slices to array pointers are known to be non-nil 2023-03-29 21:55:11 +00:00
nilptr4.go
nilptr5_aix.go
nilptr5_wasm.go
nilptr5.go cmd/compile: handle partially overlapping assignments 2022-08-23 19:56:32 +00:00
nilptr_aix.go
nilptr.go
noinit.go cmd/compile: reenable inline static init 2023-04-14 17:57:36 +00:00
nosplit.go runtime, cmd: rationalize StackLimit and StackGuard 2023-04-21 19:28:56 +00:00
nowritebarrier.go
nul1.go
opt_branchlikely.go
parentype.go
peano.go
phiopt.go
print.go
print.out
printbig.go
printbig.out
prove_constant_folding.go cmd/compile: fold constants found by prove 2022-05-04 20:30:17 +00:00
prove_invert_loop_with_unused_iterators.go cmd/compile: try to rewrite loops to count down 2023-07-31 18:33:29 +00:00
prove.go cmd/compile: teach prove about bitwise OR operation 2023-04-10 17:13:41 +00:00
range.go
README.md internal/testdir: move to cmd/internal/testdir 2023-05-12 17:18:08 +00:00
recover1.go
recover2.go
recover3.go
recover4.go
recover5.go
recover.go
reflectmethod1.go
reflectmethod2.go
reflectmethod3.go
reflectmethod4.go
reflectmethod5.go
reflectmethod6.go
reflectmethod7.go
reflectmethod8.go
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
reorder.go
retjmp.go
return.go
rotate0.go
rotate1.go
rotate2.go
rotate3.go
rotate.go
rune.go
runtime.go
shift1.go
shift2.go
shift3.go cmd/compile: adjust types2 shift check to match go/types (cleanup) 2022-04-07 17:19:55 +00:00
sieve.go
sigchld.go all: add wasip1 support 2023-04-11 20:56:32 +00:00
sigchld.out
simassign.go
sizeof.go
slice3.go
slice3err.go
slicecap.go
sliceopt.go
solitaire.go
stack.go
stackobj2.go
stackobj3.go
stackobj.go
strcopy.go
strength.go
string_lit.go
stringrange.go
struct0.go
switch2.go go/parser: adjustments to error messages 2022-09-01 22:37:04 +00:00
switch3.go
switch4.go
switch5.go
switch6.go cmd/compile: use "missing method m" instead of "missing m method" 2022-09-24 17:04:15 +00:00
switch7.go
switch.go [dev.unified] test: add switch test case for tricky nil handling 2022-07-19 23:30:49 +00:00
tighten.go cmd/compile: enhance tighten pass for memory values 2023-05-16 01:01:38 +00:00
tinyfin.go
torture.go
turing.go
typecheck.go
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
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
typeswitch.go
uintptrescapes2.go
uintptrescapes3.go
uintptrescapes.go
uintptrkeepalive.go cmd/compile: add //go:uintptrkeepalive 2022-04-21 18:06:38 +00:00
undef.go
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
utf.go
varerr.go
varinit.go
winbatch.go
writebarrier.go
zerodivide.go
zerosize.go cmd/link: put zero-sized data symbols at same address as runtime.zerobase 2023-04-28 18:35:43 +00:00

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.