mirror of
https://github.com/golang/go
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743117a85e
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> |
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| alias3.dir | ||
| bench | ||
| chan | ||
| ddd2.dir | ||
| dwarf | ||
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| import2.dir | ||
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| interface | ||
| intrinsic.dir | ||
| ken | ||
| linkname.dir | ||
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| safe | ||
| stress | ||
| syntax | ||
| uintptrescapes.dir | ||
| 64bit.go | ||
| 235.go | ||
| alg.go | ||
| alias1.go | ||
| alias2.go | ||
| alias3.go | ||
| alias.go | ||
| append1.go | ||
| append.go | ||
| args.go | ||
| armimm.go | ||
| assign1.go | ||
| assign.go | ||
| atomicload.go | ||
| bigalg.go | ||
| bigmap.go | ||
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| bounds.go | ||
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| chanlinear.go | ||
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| checkbce.go | ||
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| cmplxdivide.c | ||
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| compos.go | ||
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| convert1.go | ||
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| convert.go | ||
| convlit1.go | ||
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| copy1.go | ||
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| crlf.go | ||
| ddd1.go | ||
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| ddd.go | ||
| decl.go | ||
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| defer.go | ||
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| devirt.go | ||
| divide.go | ||
| divmod.go | ||
| empty.go | ||
| env.go | ||
| eof1.go | ||
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| escape2.go | ||
| escape2n.go | ||
| escape3.go | ||
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| escape5.go | ||
| escape_array.go | ||
| escape_because.go | ||
| escape_calls.go | ||
| escape_closure.go | ||
| 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 | ||
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| func6.go | ||
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| func.go | ||
| funcdup2.go | ||
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| gc1.go | ||
| gc2.go | ||
| gc.go | ||
| gcstring.go | ||
| goprint.go | ||
| goprint.out | ||
| goto.go | ||
| heapsampling.go | ||
| helloworld.go | ||
| helloworld.out | ||
| if.go | ||
| import1.go | ||
| import2.go | ||
| import4.go | ||
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| import6.go | ||
| import.go | ||
| index0.go | ||
| index1.go | ||
| index2.go | ||
| index.go | ||
| indirect1.go | ||
| indirect.go | ||
| init1.go | ||
| init.go | ||
| initcomma.go | ||
| initialize.go | ||
| initializerr.go | ||
| initloop.go | ||
| inline_caller.go | ||
| inline_callers.go | ||
| inline_literal.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 | ||
| linkname.go | ||
| linkobj.go | ||
| linkx_run.go | ||
| linkx.go | ||
| literal.go | ||
| live1.go | ||
| live2.go | ||
| live_syscall.go | ||
| live.go | ||
| locklinear.go | ||
| loopbce.go | ||
| makechan.go | ||
| makemap.go | ||
| makenew.go | ||
| mallocfin.go | ||
| map1.go | ||
| map.go | ||
| maplinear.go | ||
| mergemul.go | ||
| method1.go | ||
| method2.go | ||
| method3.go | ||
| method4.go | ||
| method5.go | ||
| method6.go | ||
| method.go | ||
| named1.go | ||
| named.go | ||
| nil.go | ||
| nilcheck.go | ||
| nilptr2.go | ||
| nilptr3.go | ||
| nilptr4.go | ||
| nilptr.go | ||
| nosplit.go | ||
| notinheap2.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 | ||
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| recover.go | ||
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| return.go | ||
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| run.go | ||
| rune.go | ||
| runtime.go | ||
| shift1.go | ||
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| 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 | ||
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| switch.go | ||
| tinyfin.go | ||
| torture.go | ||
| turing.go | ||
| typecheck.go | ||
| typecheckloop.go | ||
| typeswitch1.go | ||
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| typeswitch3.go | ||
| typeswitch.go | ||
| uintptrescapes2.go | ||
| uintptrescapes.go | ||
| undef.go | ||
| utf.go | ||
| varerr.go | ||
| varinit.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:
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
gccgoand other Go tool chains.