mirror of
https://github.com/golang/go
synced 2024-11-23 05:10:09 -07:00
600259b099
The current layout algorithm tries to put consecutive blocks together,
so the priority of the successor block is higher than the priority of
the zero indegree block. This algorithm is beneficial for subsequent
register allocation, but will result in more branch instructions.
The depth-first topological sorting algorithm is a well-known layout
algorithm, which has applications in many languages, and it helps to
reduce branch instructions. This CL applies it to the layout pass.
The test results show that it helps to reduce the code size.
This CL also includes the following changes:
1, Removed the primary predecessor mechanism. The new layout algorithm is
not very friendly to register allocator in some cases, in order to adapt
to the new layout algorithm, a new primary predecessor selection strategy
is introduced.
2, Since the new layout implementation may place non-loop blocks between
loop blocks, some adaptive modifications have also been made to looprotate
pass.
3, The layout also affects the results of codegen, so this CL also adjusted
several codegen tests accordingly.
It is inevitable that this CL will cause the code size or performance of a
few functions to decrease, but the number of cases it improves is much larger
than the number of cases it drops.
Statistical data from compilecmp on linux/amd64 is as follow:
name old time/op new time/op delta
Template 382ms ± 4% 382ms ± 4% ~ (p=0.497 n=49+50)
Unicode 170ms ± 9% 169ms ± 8% ~ (p=0.344 n=48+50)
GoTypes 2.01s ± 4% 2.01s ± 4% ~ (p=0.628 n=50+48)
Compiler 190ms ±10% 189ms ± 9% ~ (p=0.734 n=50+50)
SSA 11.8s ± 2% 11.8s ± 3% ~ (p=0.877 n=50+50)
Flate 241ms ± 9% 241ms ± 8% ~ (p=0.897 n=50+49)
GoParser 366ms ± 3% 361ms ± 4% -1.21% (p=0.004 n=47+50)
Reflect 835ms ± 3% 838ms ± 3% ~ (p=0.275 n=50+49)
Tar 336ms ± 4% 335ms ± 3% ~ (p=0.454 n=48+48)
XML 433ms ± 4% 431ms ± 3% ~ (p=0.071 n=49+48)
LinkCompiler 706ms ± 4% 705ms ± 4% ~ (p=0.608 n=50+49)
ExternalLinkCompiler 1.85s ± 3% 1.83s ± 2% -1.47% (p=0.000 n=49+48)
LinkWithoutDebugCompiler 437ms ± 5% 437ms ± 6% ~ (p=0.953 n=49+50)
[Geo mean] 615ms 613ms -0.37%
name old alloc/op new alloc/op delta
Template 38.7MB ± 1% 38.7MB ± 1% ~ (p=0.834 n=50+50)
Unicode 28.1MB ± 0% 28.1MB ± 0% -0.22% (p=0.000 n=49+50)
GoTypes 168MB ± 1% 168MB ± 1% ~ (p=0.054 n=47+47)
Compiler 23.0MB ± 1% 23.0MB ± 1% ~ (p=0.432 n=50+50)
SSA 1.54GB ± 0% 1.54GB ± 0% +0.21% (p=0.000 n=50+50)
Flate 23.6MB ± 1% 23.6MB ± 1% ~ (p=0.153 n=43+46)
GoParser 35.1MB ± 1% 35.1MB ± 2% ~ (p=0.202 n=50+50)
Reflect 84.7MB ± 1% 84.7MB ± 1% ~ (p=0.333 n=48+49)
Tar 34.5MB ± 1% 34.5MB ± 1% ~ (p=0.406 n=46+49)
XML 44.3MB ± 2% 44.2MB ± 3% ~ (p=0.981 n=50+50)
LinkCompiler 131MB ± 0% 128MB ± 0% -2.74% (p=0.000 n=50+50)
ExternalLinkCompiler 120MB ± 0% 120MB ± 0% +0.01% (p=0.007 n=50+50)
LinkWithoutDebugCompiler 77.3MB ± 0% 77.3MB ± 0% -0.02% (p=0.000 n=50+50)
[Geo mean] 69.3MB 69.1MB -0.22%
file before after Δ %
addr2line 4104220 4043684 -60536 -1.475%
api 5342502 5249678 -92824 -1.737%
asm 4973785 4858257 -115528 -2.323%
buildid 2667844 2625660 -42184 -1.581%
cgo 4686849 4616313 -70536 -1.505%
compile 23667431 23268406 -399025 -1.686%
cover 4959676 4874108 -85568 -1.725%
dist 3515934 3450422 -65512 -1.863%
doc 3995581 3925469 -70112 -1.755%
fix 3379202 3318522 -60680 -1.796%
link 6743249 6629913 -113336 -1.681%
nm 4047529 3991777 -55752 -1.377%
objdump 4456151 4388151 -68000 -1.526%
pack 2435040 2398072 -36968 -1.518%
pprof 13804080 13565808 -238272 -1.726%
test2json 2690043 2645987 -44056 -1.638%
trace 10418492 10232716 -185776 -1.783%
vet 7258259 7121259 -137000 -1.888%
total 113145867 111204202 -1941665 -1.716%
The situation on linux/arm64 is as follow:
name old time/op new time/op delta
Template 280ms ± 1% 282ms ± 1% +0.75% (p=0.000 n=46+48)
Unicode 124ms ± 2% 124ms ± 2% +0.37% (p=0.045 n=50+50)
GoTypes 1.69s ± 1% 1.70s ± 1% +0.56% (p=0.000 n=49+50)
Compiler 122ms ± 1% 123ms ± 1% +0.93% (p=0.000 n=50+50)
SSA 12.6s ± 1% 12.7s ± 0% +0.72% (p=0.000 n=50+50)
Flate 170ms ± 1% 172ms ± 1% +0.97% (p=0.000 n=49+49)
GoParser 262ms ± 1% 263ms ± 1% +0.39% (p=0.000 n=49+48)
Reflect 639ms ± 1% 650ms ± 1% +1.63% (p=0.000 n=49+49)
Tar 243ms ± 1% 245ms ± 1% +0.82% (p=0.000 n=50+50)
XML 324ms ± 1% 327ms ± 1% +0.72% (p=0.000 n=50+49)
LinkCompiler 597ms ± 1% 596ms ± 1% -0.27% (p=0.001 n=48+47)
ExternalLinkCompiler 1.90s ± 1% 1.88s ± 1% -1.00% (p=0.000 n=50+50)
LinkWithoutDebugCompiler 364ms ± 1% 363ms ± 1% ~ (p=0.220 n=49+50)
[Geo mean] 485ms 488ms +0.49%
name old alloc/op new alloc/op delta
Template 38.7MB ± 0% 38.8MB ± 1% ~ (p=0.093 n=43+49)
Unicode 28.4MB ± 0% 28.4MB ± 0% +0.03% (p=0.000 n=49+45)
GoTypes 169MB ± 1% 169MB ± 1% +0.23% (p=0.010 n=50+50)
Compiler 23.2MB ± 1% 23.2MB ± 1% +0.11% (p=0.000 n=40+44)
SSA 1.54GB ± 0% 1.55GB ± 0% +0.45% (p=0.000 n=47+49)
Flate 23.8MB ± 2% 23.8MB ± 1% ~ (p=0.543 n=50+50)
GoParser 35.3MB ± 1% 35.4MB ± 1% ~ (p=0.792 n=50+50)
Reflect 85.2MB ± 1% 85.2MB ± 0% ~ (p=0.055 n=50+47)
Tar 34.5MB ± 1% 34.5MB ± 1% +0.06% (p=0.015 n=50+50)
XML 43.8MB ± 2% 43.9MB ± 2% +0.19% (p=0.000 n=48+48)
LinkCompiler 137MB ± 0% 136MB ± 0% -0.92% (p=0.000 n=50+50)
ExternalLinkCompiler 127MB ± 0% 127MB ± 0% ~ (p=0.516 n=50+50)
LinkWithoutDebugCompiler 84.0MB ± 0% 84.0MB ± 0% ~ (p=0.057 n=50+50)
[Geo mean] 70.4MB 70.4MB +0.01%
file before after Δ %
addr2line 4021557 4002933 -18624 -0.463%
api 5127847 5028503 -99344 -1.937%
asm 5034716 4936836 -97880 -1.944%
buildid 2608118 2594094 -14024 -0.538%
cgo 4488592 4398320 -90272 -2.011%
compile 22501129 22213592 -287537 -1.278%
cover 4742301 4713573 -28728 -0.606%
dist 3388071 3365311 -22760 -0.672%
doc 3802250 3776082 -26168 -0.688%
fix 3306147 3216939 -89208 -2.698%
link 6404483 6363699 -40784 -0.637%
nm 3941026 3921930 -19096 -0.485%
objdump 4383330
|
||
|---|---|---|
| .. | ||
| abi | ||
| alias3.dir | ||
| bench | ||
| chan | ||
| closure3.dir | ||
| closure5.dir | ||
| codegen | ||
| ddd2.dir | ||
| dwarf | ||
| fixedbugs | ||
| import2.dir | ||
| import4.dir | ||
| interface | ||
| intrinsic.dir | ||
| ken | ||
| linkname.dir | ||
| method4.dir | ||
| oldescape_linkname.dir | ||
| retjmp.dir | ||
| runtime | ||
| stress | ||
| syntax | ||
| typeparam | ||
| uintptrescapes.dir | ||
| 64bit.go | ||
| 235.go | ||
| alg.go | ||
| alias1.go | ||
| alias2.go | ||
| alias3.go | ||
| alias.go | ||
| align.go | ||
| append1.go | ||
| append.go | ||
| args.go | ||
| armimm.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 | ||
| clearfat.go | ||
| closedchan.go | ||
| closure1.go | ||
| closure2.go | ||
| 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 | ||
| const.go | ||
| convert1.go | ||
| convert2.go | ||
| convert3.go | ||
| convert.go | ||
| convlit1.go | ||
| convlit.go | ||
| convT2X.go | ||
| copy1.go | ||
| copy.go | ||
| crlf.go | ||
| ddd1.go | ||
| ddd2.go | ||
| ddd.go | ||
| decl.go | ||
| declbad.go | ||
| defer.go | ||
| defererrcheck.go | ||
| deferfin.go | ||
| defernil.go | ||
| deferprint.go | ||
| deferprint.out | ||
| devirt.go | ||
| directive.go | ||
| divide.go | ||
| divmod.go | ||
| embedfunc.go | ||
| embedvers.go | ||
| empty.go | ||
| env.go | ||
| eof1.go | ||
| eof.go | ||
| escape2.go | ||
| escape2n.go | ||
| escape3.go | ||
| escape4.go | ||
| escape5.go | ||
| escape_array.go | ||
| escape_calls.go | ||
| escape_closure.go | ||
| escape_field.go | ||
| escape_goto.go | ||
| escape_hash_maphash.go | ||
| escape_iface.go | ||
| escape_indir.go | ||
| escape_level.go | ||
| escape_map.go | ||
| escape_param.go | ||
| escape_runtime_atomic.go | ||
| escape_selfassign.go | ||
| escape_slice.go | ||
| escape_struct_param1.go | ||
| escape_struct_param2.go | ||
| escape_struct_return.go | ||
| escape_sync_atomic.go | ||
| escape_unsafe.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 | ||
| gcgort.go | ||
| gcstring.go | ||
| goprint.go | ||
| goprint.out | ||
| goto.go | ||
| heapsampling.go | ||
| helloworld.go | ||
| helloworld.out | ||
| if.go | ||
| import1.go | ||
| 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 | ||
| initempty.go | ||
| initexp.go | ||
| initialize.go | ||
| initializerr.go | ||
| initloop.go | ||
| inline_big.go | ||
| inline_caller.go | ||
| inline_callers.go | ||
| inline_literal.go | ||
| inline_math_bits_rotate.go | ||
| inline_sync.go | ||
| inline_variadic.go | ||
| inline.go | ||
| int_lit.go | ||
| intcvt.go | ||
| intrinsic_atomic.go | ||
| intrinsic.go | ||
| iota.go | ||
| label1.go | ||
| label.go | ||
| linkmain_run.go | ||
| linkmain.go | ||
| linkname2.go | ||
| linkname.go | ||
| linkobj.go | ||
| linkx_run.go | ||
| linkx.go | ||
| literal2.go | ||
| literal.go | ||
| live1.go | ||
| live2.go | ||
| live_syscall.go | ||
| live.go | ||
| locklinear.go | ||
| loopbce.go | ||
| mainsig.go | ||
| makechan.go | ||
| makemap.go | ||
| makenew.go | ||
| makeslice.go | ||
| mallocfin.go | ||
| map1.go | ||
| map.go | ||
| mapclear.go | ||
| maplinear.go | ||
| mergemul.go | ||
| method1.go | ||
| method2.go | ||
| method3.go | ||
| method4.go | ||
| method5.go | ||
| method6.go | ||
| method7.go | ||
| method.go | ||
| named1.go | ||
| named.go | ||
| nil.go | ||
| nilcheck.go | ||
| nilptr2.go | ||
| nilptr3.go | ||
| nilptr4.go | ||
| nilptr5_aix.go | ||
| nilptr5_wasm.go | ||
| nilptr5.go | ||
| nilptr_aix.go | ||
| nilptr.go | ||
| nosplit.go | ||
| notinheap2.go | ||
| notinheap3.go | ||
| notinheap.go | ||
| nowritebarrier.go | ||
| nul1.go | ||
| opt_branchlikely.go | ||
| parentype.go | ||
| peano.go | ||
| phiopt.go | ||
| print.go | ||
| print.out | ||
| printbig.go | ||
| printbig.out | ||
| prove.go | ||
| range.go | ||
| README.md | ||
| 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 | ||
| rename1.go | ||
| rename.go | ||
| reorder2.go | ||
| reorder.go | ||
| retjmp.go | ||
| return.go | ||
| rotate0.go | ||
| rotate1.go | ||
| rotate2.go | ||
| rotate3.go | ||
| rotate.go | ||
| run.go | ||
| rune.go | ||
| runtime.go | ||
| shift1.go | ||
| 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 | ||
| stackobj2.go | ||
| stackobj3.go | ||
| stackobj.go | ||
| strcopy.go | ||
| strength.go | ||
| string_lit.go | ||
| stringrange.go | ||
| struct0.go | ||
| switch2.go | ||
| switch3.go | ||
| switch4.go | ||
| switch5.go | ||
| switch6.go | ||
| switch7.go | ||
| switch.go | ||
| tinyfin.go | ||
| torture.go | ||
| turing.go | ||
| typecheck.go | ||
| typecheckloop.go | ||
| typeswitch1.go | ||
| typeswitch2.go | ||
| typeswitch2b.go | ||
| typeswitch3.go | ||
| typeswitch.go | ||
| uintptrescapes2.go | ||
| uintptrescapes3.go | ||
| uintptrescapes.go | ||
| undef.go | ||
| used.go | ||
| utf.go | ||
| varerr.go | ||
| varinit.go | ||
| winbatch.go | ||
| writebarrier.go | ||
| zerodivide.go | ||
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 run run.go
To run just tests from specified files in this directory, execute:
../bin/go run run.go -- 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
gccgoand other Go tool chains.