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Michael Munday fcc036f03b cmd/compile: optimise float <-> int register moves on riscv64 
Use the FMV* instructions to move values between the floating point and
integer register files.

Note: I'm unsure why there is a slowdown in the Float32bits benchmark,
I've checked and an FMVXS instruction is being used as expected. There
are multiple loads and other instructions in the main loop.

goos: linux
goarch: riscv64
pkg: math
cpu: Spacemit(R) X60
                    │ fmv-before.txt │            fmv-after.txt            │
                    │     sec/op     │   sec/op     vs base                │
Acos                     122.7n ± 0%   122.7n ± 0%        ~ (p=1.000 n=10)
Acosh                    197.2n ± 0%   191.5n ± 0%   -2.89% (p=0.000 n=10)
Asin                     122.7n ± 0%   122.7n ± 0%        ~ (p=0.474 n=10)
Asinh                    231.0n ± 0%   224.1n ± 0%   -2.99% (p=0.000 n=10)
Atan                     91.39n ± 0%   91.41n ± 0%        ~ (p=0.465 n=10)
Atanh                    210.3n ± 0%   203.4n ± 0%   -3.26% (p=0.000 n=10)
Atan2                    149.6n ± 0%   149.6n ± 0%        ~ (p=0.721 n=10)
Cbrt                     176.5n ± 0%   165.9n ± 0%   -6.01% (p=0.000 n=10)
Ceil                     25.67n ± 0%   24.42n ± 0%   -4.87% (p=0.000 n=10)
Copysign                 3.756n ± 0%   3.756n ± 0%        ~ (p=0.149 n=10)
Cos                      95.15n ± 0%   95.15n ± 0%        ~ (p=0.374 n=10)
Cosh                     228.6n ± 0%   224.7n ± 0%   -1.71% (p=0.000 n=10)
Erf                      115.2n ± 0%   115.2n ± 0%        ~ (p=0.474 n=10)
Erfc                     116.4n ± 0%   116.4n ± 0%        ~ (p=0.628 n=10)
Erfinv                   133.3n ± 0%   133.3n ± 0%        ~ (p=1.000 n=10)
Erfcinv                  133.3n ± 0%   133.3n ± 0%        ~ (p=1.000 n=10)
Exp                      194.1n ± 0%   190.3n ± 0%   -1.93% (p=0.000 n=10)
ExpGo                    204.7n ± 0%   200.3n ± 0%   -2.15% (p=0.000 n=10)
Expm1                    137.7n ± 0%   135.2n ± 0%   -1.82% (p=0.000 n=10)
Exp2                     173.4n ± 0%   169.0n ± 0%   -2.54% (p=0.000 n=10)
Exp2Go                   182.8n ± 0%   178.4n ± 0%   -2.41% (p=0.000 n=10)
Abs                      3.756n ± 0%   3.756n ± 0%        ~ (p=0.157 n=10)
Dim                      12.52n ± 0%   12.52n ± 0%        ~ (p=0.737 n=10)
Floor                    25.67n ± 0%   24.42n ± 0%   -4.87% (p=0.000 n=10)
Max                      21.29n ± 0%   20.03n ± 0%   -5.92% (p=0.000 n=10)
Min                      21.28n ± 0%   20.04n ± 0%   -5.85% (p=0.000 n=10)
Mod                      344.9n ± 0%   319.2n ± 0%   -7.45% (p=0.000 n=10)
Frexp                    55.71n ± 0%   48.85n ± 0%  -12.30% (p=0.000 n=10)
Gamma                    165.9n ± 0%   167.8n ± 0%   +1.15% (p=0.000 n=10)
Hypot                    73.24n ± 0%   70.74n ± 0%   -3.41% (p=0.000 n=10)
HypotGo                  84.50n ± 0%   82.63n ± 0%   -2.21% (p=0.000 n=10)
Ilogb                    49.45n ± 0%   45.70n ± 0%   -7.59% (p=0.000 n=10)
J0                       556.5n ± 0%   544.0n ± 0%   -2.25% (p=0.000 n=10)
J1                       555.3n ± 0%   542.8n ± 0%   -2.24% (p=0.000 n=10)
Jn                       1.181µ ± 0%   1.156µ ± 0%   -2.12% (p=0.000 n=10)
Ldexp                    59.47n ± 0%   53.84n ± 0%   -9.47% (p=0.000 n=10)
Lgamma                   167.2n ± 0%   154.6n ± 0%   -7.51% (p=0.000 n=10)
Log                      160.9n ± 0%   154.6n ± 0%   -3.92% (p=0.000 n=10)
Logb                     49.45n ± 0%   45.70n ± 0%   -7.58% (p=0.000 n=10)
Log1p                    147.1n ± 0%   137.1n ± 0%   -6.80% (p=0.000 n=10)
Log10                    162.1n ± 1%   154.6n ± 0%   -4.63% (p=0.000 n=10)
Log2                     66.99n ± 0%   60.72n ± 0%   -9.36% (p=0.000 n=10)
Modf                     29.42n ± 0%   26.29n ± 0%  -10.64% (p=0.000 n=10)
Nextafter32              41.95n ± 0%   37.88n ± 0%   -9.70% (p=0.000 n=10)
Nextafter64              38.82n ± 0%   33.49n ± 0%  -13.73% (p=0.000 n=10)
PowInt                   252.3n ± 0%   237.3n ± 0%   -5.95% (p=0.000 n=10)
PowFrac                  615.5n ± 0%   589.7n ± 0%   -4.19% (p=0.000 n=10)
Pow10Pos                 10.64n ± 0%   10.64n ± 0%        ~ (p=1.000 n=10)
Pow10Neg                 24.42n ± 0%   15.02n ± 0%  -38.49% (p=0.000 n=10)
Round                    21.91n ± 0%   18.16n ± 0%  -17.12% (p=0.000 n=10)
RoundToEven              24.42n ± 0%   21.29n ± 0%  -12.84% (p=0.000 n=10)
Remainder                308.0n ± 0%   291.2n ± 0%   -5.44% (p=0.000 n=10)
Signbit                  10.02n ± 0%   10.02n ± 0%        ~ (p=1.000 n=10)
Sin                      102.7n ± 0%   102.7n ± 0%        ~ (p=0.211 n=10)
Sincos                   124.0n ± 1%   123.3n ± 0%   -0.56% (p=0.002 n=10)
Sinh                     239.1n ± 0%   234.7n ± 0%   -1.84% (p=0.000 n=10)
SqrtIndirect             2.504n ± 0%   2.504n ± 0%        ~ (p=0.303 n=10)
SqrtLatency              15.03n ± 0%   15.02n ± 0%        ~ (p=0.598 n=10)
SqrtIndirectLatency      15.02n ± 0%   15.02n ± 0%        ~ (p=0.907 n=10)
SqrtGoLatency            165.3n ± 0%   157.2n ± 0%   -4.90% (p=0.000 n=10)
SqrtPrime                3.801µ ± 0%   3.802µ ± 0%        ~ (p=1.000 n=10)
Tan                      125.2n ± 0%   125.2n ± 0%        ~ (p=0.458 n=10)
Tanh                     244.2n ± 0%   239.9n ± 0%   -1.76% (p=0.000 n=10)
Trunc                    25.67n ± 0%   24.42n ± 0%   -4.87% (p=0.000 n=10)
Y0                       550.2n ± 0%   538.1n ± 0%   -2.21% (p=0.000 n=10)
Y1                       552.8n ± 0%   540.6n ± 0%   -2.21% (p=0.000 n=10)
Yn                       1.168µ ± 0%   1.143µ ± 0%   -2.14% (p=0.000 n=10)
Float64bits              8.139n ± 0%   4.385n ± 0%  -46.13% (p=0.000 n=10)
Float64frombits          7.512n ± 0%   3.759n ± 0%  -49.96% (p=0.000 n=10)
Float32bits              8.138n ± 0%   9.393n ± 0%  +15.42% (p=0.000 n=10)
Float32frombits          7.513n ± 0%   3.757n ± 0%  -49.98% (p=0.000 n=10)
FMA                      3.756n ± 0%   3.756n ± 0%        ~ (p=0.246 n=10)
geomean                  77.43n        72.42n        -6.47%

Change-Id: I8dac69b1d17cb3d2af78d1c844d2b5d80000d667
Reviewed-on: https://go-review.googlesource.com/c/go/+/599235
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Munday <mikemndy@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@golang.org>
2025-08-05 08:27:15 -07:00
..
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: optimise float <-> int register moves on riscv64 2025-08-05 08:27:15 -07:00
ddd2.dir all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
dwarf test: make rundir match compiledir/errorcheckdir. 2013-01-11 22:00:48 +01:00
fixedbugs cmd/compile: enforce that locals are always accessed with SP base register 2025-08-01 08:57:29 -07:00
import2.dir all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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 test/ken/slicearray.go: correct type width in comment 2021-12-05 12:50:44 +00:00
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 cmd/gc: do not omit wrapper for expression (interface{...}).F 2014-01-07 13:26:48 +01:00
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 cmd/compile: export/import materialized aliases 2024-04-05 16:29:58 +00:00
uintptrescapes.dir cmd/compile, syscall: add //go:uintptrescapes comment, and use it 2016-07-06 20:48:41 +00:00
wasmmemsize.dir test: add a test for wasm memory usage 2024-10-28 13:27:58 +00:00
64bit.go cmd/gc: Error out on division by constant zero. 2013-01-30 20:21:08 +01:00
235.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
alg.go test: add test that required algs get generated 2016-04-24 21:36:52 +00:00
alias.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +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
align.go test: check that unaligned load-add opcodes work. 2018-04-09 18:57:37 +00:00
append.go cmd/compile: optimize append(x, make([]T, y)...) slice extension 2018-05-06 04:28:23 +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
args.go test: run some more tests by default 2012-11-08 09:04:27 -08:00
armimm.go cmd/internal/obj: continue to optimize ARM's constant pool 2017-05-11 13:53:54 +00:00
asmhdr.go cmd/compile: emit sensible go_asm.h consts for big ints 2021-10-30 18:30:05 +00:00
assign.go sync: add explicit noCopy fields to Map, Mutex, and Once 2024-11-18 18:52:54 +00:00
assign1.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
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
blank.go test: revert changes made for Go SSA interpreter test. 2013-10-08 14:36:20 -04:00
blank1.go [dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams' 2020-12-14 12:13:36 -08:00
bom.go gc: initial BOM is legal. 2012-09-10 13:03:07 -07:00
bombad.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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_lit.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
char_lit1.go cmd/compile: do not report error for invalid constant 2021-03-05 18:46:43 +00:00
checkbce.go cmd/compile: rewrite the constant parts of the prove pass 2024-08-07 16:07:33 +00:00
clear.go cmd/compile: add clear(x) builtin 2023-01-31 19:43:07 +00:00
clearfat.go [dev.power64] 9g: fix under-zeroing in clearfat 2014-10-31 11:08:27 -04:00
closedchan.go test: use testlib (first 100) 2012-02-16 23:48:57 -05:00
closure.go test: enforce 1 proc in the test 2012-07-01 21:59:50 +04:00
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 cmd/compile/internal/gc: add nil check for closure call on wasm 2018-08-14 09:19:38 +00:00
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
cmp.go Fix several out of date references to 4g/5g/6g/8g/9g. 2015-06-26 03:38:21 +00:00
cmp6.go [dev.typeparams] test: add scaffolding to run.go to check compiler with -G flag 2020-12-01 21:49:31 +00:00
cmplx.go cmd/compile: rewrite f(g()) for multi-value g() during typecheck 2019-03-14 21:00:20 +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
cmplxdivide1.go runtime: make complex division c99 compatible 2017-03-15 22:45:17 +00:00
complit.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
complit1.go go/types, types2: report better error messages for slice expressions 2025-03-11 05:44:15 -07:00
compos.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
const.go cmd/compile: apply constant folding to ORUNESTR 2019-09-26 23:54:29 +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
convert.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
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
convinline.go cmd/compile: handle integer conversions in static init inliner 2022-11-17 13:46:05 +00:00
convlit.go cmd/compile/internal/types2: refactor untyped conversions 2021-03-23 05:11:09 +00:00
convlit1.go test: [a-c]: add introductory comments to tests 2012-02-19 13:19:43 +11:00
convT2X.go cmd/gc: cache itab lookup in convT2I. 2012-07-03 09:09:05 +10:00
copy.go test: ensure all failing tests exit nonzero. 2013-02-12 13:17:49 -05:00
copy1.go go/types, types2: better error messages for copy built-in 2025-03-10 21:30:51 -07:00
crlf.go test: use testlib in a few more cases (part 2) 2012-04-20 23:45:43 +08:00
ddd.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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
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 test: remove rundircmpout and cmpout actions 2018-05-31 17:36:45 +00:00
deferprint.out test: split golden.out into expected output per test 2012-01-18 16:12:24 -08:00
devirt.go [dev.typeparams] cmd/compile: simplify interface conversions 2021-08-09 16:10:20 +00:00
directive.go cmd/compile: restrict //go:notinheap to runtime/internal/sys 2022-09-02 06:22:23 +00:00
directive2.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 all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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
eof.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
eof1.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
escape.go cmd/compile: experimental loop iterator capture semantics change 2023-03-06 18:34:24 +00:00
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 all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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.go cmd/compile/internal/escape: propagate constants to interface conversions to avoid allocs 2025-05-21 12:02:43 -07:00
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_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: stack allocate variable-sized makeslice 2025-04-04 10:36:58 -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
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_lit.go test: ensure all failing tests exit nonzero. 2013-02-12 13:17:49 -05:00
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
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
func.go test: explanatory comments [c-g]* 2012-02-19 14:28:53 +11:00
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
funcdup.go [dev.typeparams] test: enable some more errorcheck tests 2020-12-04 21:22:23 +00:00
funcdup2.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
gc.go test: explanatory comments [c-g]* 2012-02-19 14:28:53 +11:00
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
gcgort.go test: fast GC+concurrency+types verification 2018-05-08 21:15:48 +00:00
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 test: split golden.out into expected output per test 2012-01-18 16:12:24 -08:00
goto.go cmd/compile: report block start for gotos jumping into blocks 2017-04-19 02:27:58 +00:00
heapsampling.go test/heapsampling.go: slow down allocation rate and reduce iterations 2022-05-27 21:36:06 +00:00
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
import.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
index.go all: fix typos 2019-09-08 17:28:20 +00:00
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
indirect.go test: commentary for [h-m]*.go 2012-02-23 18:47:26 +11:00
indirect1.go test: commentary for [h-m]*.go 2012-02-23 18:47:26 +11:00
init.go [dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams' 2020-12-14 12:13:36 -08:00
init1.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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.go cmd/compile: remove no-longer-necessary recursive inlining checks 2025-03-06 10:07:17 -08:00
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
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.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 test: commentary for [h-m]*.go 2012-02-23 18:47:26 +11:00
label.go test: match gofrontend error messages 2020-11-28 02:31:54 +00:00
label1.go test: match gofrontend error messages 2020-11-28 02:31:54 +00:00
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 test: remove -newescape from regress tests 2019-08-28 19:27:20 +00:00
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 [dev.link] all: clean up some TODOs 2019-11-01 20:13:05 +00:00
linkx_run.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
literal.go test: ensure all failing tests exit nonzero. 2013-02-12 13:17:49 -05:00
literal2.go cmd/compile: accept 'i' suffix orthogonally on all numbers 2019-02-19 22:45:09 +00:00
live.go all: remove GOEXPERIMENT=swissmap 2025-07-30 11:47:14 -07:00
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 all: remove GOEXPERIMENT=swissmap 2025-07-30 11:47:14 -07:00
live_uintptrkeepalive.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
loopbce.go cmd/compile: remove no-longer-necessary recursive inlining checks 2025-03-06 10:07:17 -08:00
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
map.go test/mapnan.go: add regression test for non-empty interfaces. 2014-08-06 17:02:55 -04:00
map1.go [dev.typeparams] merge: merge branch 'dev.regabi' into 'dev.typeparams' 2020-12-14 12:13:36 -08:00
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
method.go test: a number of fixes. 2013-02-11 18:20:52 -05:00
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
named.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
named1.go [dev.typeparams] test: enable some more errorcheck tests 2020-12-04 21:22:23 +00:00
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
nilptr.go cmd/link: use >4GB base address for 64-bit PE binaries 2025-05-12 11:05:28 -07:00
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 all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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 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 test: remove rundircmpout and cmpout actions 2018-05-31 17:36:45 +00:00
print.out cmd/compile: fix print/println when input is uint 2017-09-26 04:08:38 +00:00
printbig.go test: remove rundircmpout and cmpout actions 2018-05-31 17:36:45 +00:00
printbig.out test: split golden.out into expected output per test 2012-01-18 16:12:24 -08:00
prove.go cmd/compile: check domination of loop return in both controls 2025-07-30 07:31:18 -07:00
prove_constant_folding.go cmd/compile: learn transitive proofs for safe positive signed adds 2025-07-24 13:48:59 -07:00
prove_invert_loop_with_unused_iterators.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
prove_popcount.go cmd/compile: compute bits.OnesCount's limits from argument's limits 2025-03-11 20:17:36 -07:00
range.go cmd/compile: improve single blank variable handling in walkrange 2017-09-12 05:50:54 +00:00
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
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
recover.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
recover1.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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 all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
recover4.go test: migrate remaining files to go:build syntax 2023-10-19 23:33:25 +00:00
recover5.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
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
rename.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
rename1.go cmd/compile/internal/types2: only mark variables as used if they are 2023-04-19 14:07:00 +00:00
reorder.go [dev.regabi] cmd/compile: cleanup OAS2FUNC ordering 2021-01-16 23:19:26 +00:00
reorder2.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
retjmp.go cmd/asm: fix assembling return jump 2018-03-01 21:11:16 +00:00
return.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
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
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 test: split golden.out into expected output per test 2012-01-18 16:12:24 -08:00
simassign.go test/[n-z]*.go: add documentation 2012-02-24 11:48:19 +11:00
sizeof.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
slice3.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
slice3err.go [dev.typeparams] test: finish triaging all outstanding failing tests 2020-12-14 21:28:48 +00:00
slicecap.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
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 test/[n-z]*.go: add documentation 2012-02-24 11:48:19 +11:00
stackobj.go cmd/compile,runtime: remove ambiguously live logic 2018-10-03 19:54:16 +00:00
stackobj2.go test: stress test for stack objects 2018-10-03 19:54:29 +00:00
stackobj3.go cmd/compile,runtime: remove ambiguously live logic 2018-10-03 19:54:16 +00:00
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 test: add []rune case to string_lit.go 2013-12-12 17:17:02 -08:00
stringrange.go all: make Unicode surrogate halves illegal as UTF-8 2012-08-08 14:01:23 -07:00
struct0.go all: make copyright headers consistent with one space after period 2016-05-02 13:43:18 +00:00
switch.go [dev.unified] test: add switch test case for tricky nil handling 2022-07-19 23:30:49 +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 cmd/gc: disallow fallthrough in final case of switch 2013-03-15 00:35:09 -04:00
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
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 cmd/8g: don't allocate a register early for cap(CHAN). 2014-07-01 09:20:51 +02:00
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
typeswitch.go test/[n-z]*.go: add documentation 2012-02-24 11:48:19 +11:00
typeswitch1.go test/[n-z]*.go: add documentation 2012-02-24 11:48:19 +11:00
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
uintptrescapes.go cmd/compile, syscall: add //go:uintptrescapes comment, and use it 2016-07-06 20:48:41 +00:00
uintptrescapes2.go [dev.typeparams] cmd/compile: skip escape analysis diagnostics for wrappers 2021-06-24 18:24:24 +00:00
uintptrescapes3.go cmd/compile: fix //go:uintptrescapes for basic method calls 2019-11-05 00:26:30 +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.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
unsafebuiltins.go cmd/compile: add support for unsafe.{String,StringData,SliceData} 2022-08-31 17:15:15 +00:00
used.go [dev.typeparams] all: merge dev.regabi (07569da) into dev.typeparams 2020-12-28 00:39:17 -08:00
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
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
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.