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Martin Möhrmann 743117a85e cmd/compile: simplify slice/array range loops for some element sizes 
In range loops over slices and arrays besides a variable to track the
index an extra variable containing the address of the current element
is used. To compute a pointer to the next element the elements size is
added to the address.

On 386 and amd64 an element of size 1, 2, 4 or 8 bytes can by copied
from an array using a MOV instruction with suitable addressing mode
that uses the start address of the array, the index of the element and
element size as scaling factor. Thereby, for arrays and slices with
suitable element size we can avoid keeping and incrementing an extra
variable to compute the next elements address.

Shrinks cmd/go by 4 kilobytes.

AMD64:
name                   old time/op    new time/op    delta
BinaryTree17              2.66s ± 7%     2.54s ± 0%  -4.53%  (p=0.000 n=10+8)
Fannkuch11                3.02s ± 1%     3.02s ± 1%    ~     (p=0.579 n=10+10)
FmtFprintfEmpty          45.6ns ± 1%    42.2ns ± 1%  -7.46%  (p=0.000 n=10+10)
FmtFprintfString         69.8ns ± 1%    70.4ns ± 1%  +0.84%  (p=0.041 n=10+10)
FmtFprintfInt            80.1ns ± 1%    79.0ns ± 1%  -1.35%  (p=0.000 n=10+10)
FmtFprintfIntInt          127ns ± 1%     125ns ± 1%  -1.00%  (p=0.007 n=10+9)
FmtFprintfPrefixedInt     158ns ± 2%     152ns ± 1%  -4.11%  (p=0.000 n=10+10)
FmtFprintfFloat           218ns ± 1%     214ns ± 1%  -1.61%  (p=0.000 n=10+10)
FmtManyArgs               508ns ± 1%     504ns ± 1%  -0.93%  (p=0.001 n=9+10)
GobDecode                6.76ms ± 1%    6.78ms ± 1%    ~     (p=0.353 n=10+10)
GobEncode                5.84ms ± 1%    5.77ms ± 1%  -1.31%  (p=0.000 n=10+9)
Gzip                      223ms ± 1%     218ms ± 1%  -2.39%  (p=0.000 n=10+10)
Gunzip                   40.3ms ± 1%    40.4ms ± 3%    ~     (p=0.796 n=10+10)
HTTPClientServer         73.5µs ± 0%    73.3µs ± 0%  -0.28%  (p=0.000 n=10+9)
JSONEncode               12.7ms ± 1%    12.6ms ± 8%    ~     (p=0.173 n=8+10)
JSONDecode               57.5ms ± 1%    56.1ms ± 2%  -2.40%  (p=0.000 n=10+10)
Mandelbrot200            3.80ms ± 1%    3.86ms ± 6%    ~     (p=0.579 n=10+10)
GoParse                  3.25ms ± 1%    3.23ms ± 1%    ~     (p=0.052 n=10+10)
RegexpMatchEasy0_32      74.4ns ± 1%    76.9ns ± 1%  +3.39%  (p=0.000 n=10+10)
RegexpMatchEasy0_1K       243ns ± 2%     248ns ± 1%  +1.86%  (p=0.000 n=10+8)
RegexpMatchEasy1_32      71.0ns ± 2%    72.8ns ± 1%  +2.55%  (p=0.000 n=10+10)
RegexpMatchEasy1_1K       370ns ± 1%     383ns ± 0%  +3.39%  (p=0.000 n=10+9)
RegexpMatchMedium_32      107ns ± 0%     113ns ± 1%  +5.33%  (p=0.000 n=6+10)
RegexpMatchMedium_1K     35.0µs ± 1%    36.0µs ± 1%  +3.13%  (p=0.000 n=10+10)
RegexpMatchHard_32       1.65µs ± 1%    1.69µs ± 1%  +2.23%  (p=0.000 n=10+9)
RegexpMatchHard_1K       49.8µs ± 1%    50.6µs ± 1%  +1.59%  (p=0.000 n=10+10)
Revcomp                   398ms ± 1%     396ms ± 1%  -0.51%  (p=0.043 n=10+10)
Template                 63.4ms ± 1%    60.8ms ± 0%  -4.11%  (p=0.000 n=10+9)
TimeParse                 318ns ± 1%     322ns ± 1%  +1.10%  (p=0.005 n=10+10)
TimeFormat                323ns ± 1%     336ns ± 1%  +4.15%  (p=0.000 n=10+10)

Updates: #15809.

Change-Id: I55915aaf6d26768e12247f8a8edf14e7630726d1
Reviewed-on: https://go-review.googlesource.com/38061
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2017-10-13 14:52:04 +00:00
..
alias3.dir
bench test/bench/go1: fix typo in parserdata_test.go comment 2017-03-22 03:23:16 +00:00
chan all: fix article typos 2017-09-15 02:39:16 +00:00
ddd2.dir
dwarf
fixedbugs test: add test case that gccgo miscompiled 2017-10-12 19:02:09 +00:00
import2.dir
import4.dir
interface cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
intrinsic.dir cmd/compile: intrinsics for math/bits.TrailingZerosX 2017-03-16 02:44:16 +00:00
ken
linkname.dir cmd/compile: include linknames in export data 2017-02-08 20:59:45 +00:00
method4.dir
safe
stress
syntax cmd/compile/internal/parser: improved a couple of error messages 2017-02-24 18:54:36 +00:00
uintptrescapes.dir
64bit.go
235.go
alg.go
alias1.go
alias2.go
alias3.go
alias.go
append1.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
append.go
args.go
armimm.go cmd/internal/obj: continue to optimize ARM's constant pool 2017-05-11 13:53:54 +00:00
assign1.go
assign.go
atomicload.go
bigalg.go
bigmap.go
blank1.go
blank.go
bom.go
bombad.go
bounds.go
chancap.go cmd/compile: generate makechan calls with int arguments 2017-08-15 05:54:24 +00:00
chanlinear.go
char_lit1.go
char_lit.go
checkbce.go test: add missing copyright header to checkbce.go 2017-05-18 00:05:25 +00:00
clearfat.go
closedchan.go
closure1.go
closure2.go
closure.go
cmp6.go
cmp.go
cmplx.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +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 cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
complit.go
compos.go
const1.go
const2.go
const3.go
const4.go
const5.go
const6.go
const.go
convert1.go
convert2.go
convert3.go
convert.go
convlit1.go
convlit.go
convT2X.go
copy1.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
copy.go
crlf.go
ddd1.go test: reenable ... test 2017-08-11 17:41:17 +00:00
ddd2.go
ddd.go
decl.go
declbad.go
defer.go
deferfin.go
deferprint.go
deferprint.out
devirt.go cmd/compile: de-virtualize interface calls 2017-03-14 18:49:23 +00:00
divide.go
divmod.go
empty.go
env.go
eof1.go
eof.go
errchk
escape2.go test: add missing escape analysis test 2017-08-11 00:56:21 +00:00
escape2n.go test: add missing escape analysis test 2017-08-11 00:56:21 +00:00
escape3.go
escape4.go cmd/compile: inline calls to local closures 2017-10-11 22:32:36 +00:00
escape5.go cmd/compile: unnamed parameters do not escape 2017-03-24 17:14:00 +00:00
escape_array.go
escape_because.go
escape_calls.go
escape_closure.go cmd/compile/internal/syntax: establish principled position information 2017-02-15 01:33:03 +00:00
escape_field.go
escape_iface.go
escape_indir.go
escape_level.go
escape_map.go
escape_param.go
escape_slice.go
escape_struct_param1.go
escape_struct_param2.go
escape_struct_return.go
escape.go
fibo.go
finprofiled.go
float_lit2.go
float_lit3.go
float_lit.go
floatcmp.go
for.go
func1.go
func2.go
func3.go
func4.go
func5.go
func6.go
func7.go
func8.go
func.go
funcdup2.go
funcdup.go
gc1.go
gc2.go
gc.go
gcstring.go
goprint.go
goprint.out
goto.go cmd/compile: report block start for gotos jumping into blocks 2017-04-19 02:27:58 +00:00
heapsampling.go
helloworld.go
helloworld.out
if.go
import1.go
import2.go
import4.go
import5.go cmd/compile: be slightly more tolerant in case of certain syntax errors 2017-03-24 20:07:15 +00:00
import6.go cmd/compile/internal/syntax: removed gcCompat code needed to pass orig. tests 2017-02-10 01:22:30 +00:00
import.go
index0.go
index1.go
index2.go
index.go
indirect1.go
indirect.go
init1.go
init.go Revert "cmd/compile: improve error message if init is directly invoked" 2017-03-06 23:48:37 +00:00
initcomma.go
initialize.go
initializerr.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
initloop.go
inline_caller.go runtime: skip logical frames in runtime.Caller 2017-04-18 19:56:30 +00:00
inline_callers.go runtime: include inlined calls in result of CallersFrames 2017-03-29 17:27:38 +00:00
inline_literal.go cmd/compile: copy literals when inlining 2017-03-03 21:29:32 +00:00
inline_variadic.go
inline.go cmd/compile: inline calls to local closures 2017-10-11 22:32:36 +00:00
int_lit.go
intcvt.go
intrinsic_atomic.go cmd/compile: intrinsify atomics on MIPS64 2017-10-10 19:43:38 +00:00
intrinsic.go
iota.go
label1.go cmd/compile/internal/gc: don't panic on continue in switch 2017-04-12 14:27:45 +00:00
label.go
linkmain_run.go
linkmain.go
linkname.go cmd/compile: include linknames in export data 2017-02-08 20:59:45 +00:00
linkobj.go
linkx_run.go
linkx.go
literal.go
live1.go
live2.go cmd/compile: eliminate stores to unread auto variables 2017-08-24 16:53:56 +00:00
live_syscall.go
live.go cmd/compile: simplify slice/array range loops for some element sizes 2017-10-13 14:52:04 +00:00
locklinear.go test: deflake locklinear again 2017-04-05 18:46:31 +00:00
loopbce.go cmd/compile: make loop guard+rotate conditional on GOEXPERIMENT 2017-06-21 22:07:33 +00:00
makechan.go cmd/compile: generate makechan calls with int arguments 2017-08-15 05:54:24 +00:00
makemap.go cmd/compile: generate makemap calls with int arguments 2017-08-22 20:28:21 +00:00
makenew.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
mallocfin.go
map1.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
map.go
maplinear.go
mergemul.go cmd/compile: combine x*n - y*n into (x-y)*n 2017-09-03 14:29:38 +00:00
method1.go
method2.go cmd/compile: add two error position tests for the typechecker 2017-10-12 20:50:20 +00:00
method3.go
method4.go
method5.go
method6.go cmd/compile: add two error position tests for the typechecker 2017-10-12 20:50:20 +00:00
method.go
named1.go
named.go
nil.go
nilcheck.go
nilptr2.go
nilptr3.go cmd/compile: remove more nil ptr checks after newobject 2017-08-25 03:26:58 +00:00
nilptr4.go
nilptr.go
nosplit.go cmd/compile: omit X:framepointer in compile version 2017-07-17 16:36:49 +00:00
notinheap2.go
notinheap.go
nowritebarrier.go
nul1.go
opt_branchlikely.go
parentype.go
peano.go
phiopt.go
print.go cmd/compile: fix print/println when input is uint 2017-09-26 04:08:38 +00:00
print.out cmd/compile: fix print/println when input is uint 2017-09-26 04:08:38 +00:00
printbig.go
printbig.out
prove.go cmd/compile/internal/gc: improve comparison with constant strings 2017-04-07 15:40:25 +00:00
range.go cmd/compile: improve single blank variable handling in walkrange 2017-09-12 05:50:54 +00:00
README.md test: add README 2017-07-26 23:37:25 +00:00
recover1.go
recover2.go
recover3.go
recover4.go
recover5.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
recover.go
reflectmethod1.go
reflectmethod2.go
reflectmethod3.go
reflectmethod4.go
rename1.go cmd/compile: avoid duplicate cast error 2017-08-22 13:44:35 +00:00
rename.go
reorder2.go
reorder.go cmd/compile: Ensure left-to-right assignment 2017-02-11 21:46:21 +00:00
return.go
rotate0.go
rotate1.go
rotate2.go
rotate3.go
rotate.go
run.go runtime: restore arm assembly stubs for div/mod 2017-06-15 03:51:03 +00:00
rune.go
runtime.go cmd/compile/internal/gc: separate builtin and real runtime packages 2017-03-01 01:06:32 +00:00
shift1.go cmd/compile: more error position tests for the typechecker 2017-04-24 12:37:49 +00:00
shift2.go
sieve.go
sigchld.go
sigchld.out
simassign.go
sinit_run.go
sinit.go
sizeof.go
slice3.go
slice3err.go
slicecap.go
sliceopt.go
solitaire.go
stack.go
strength.go
string_lit.go
stringrange.go
struct0.go
switch2.go
switch3.go
switch4.go
switch5.go cmd/compile: make duplicate expr cases readable 2017-05-19 18:11:51 +00:00
switch6.go cmd/compile: improve error for wrong type in switch 2017-02-02 17:36:43 +00:00
switch7.go cmd/compile: make duplicate expr cases readable 2017-05-19 18:11:51 +00:00
switch.go
tinyfin.go
torture.go
turing.go
typecheck.go
typecheckloop.go
typeswitch1.go
typeswitch2.go cmd/compile/internal/syntax: removed gcCompat code needed to pass orig. tests 2017-02-10 01:22:30 +00:00
typeswitch3.go cmd/compile: add test for non interface type switch 2017-03-25 22:52:54 +00:00
typeswitch.go
uintptrescapes2.go
uintptrescapes.go
undef.go
utf.go
varerr.go
varinit.go
writebarrier.go cmd/compile: don't use statictmps for SSA-able composite literals 2017-05-11 18:28:40 +00:00
zerodivide.go

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:

go run run.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.