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package main | |
import "testing" | |
var testSlice = [2]byte{0xC6} | |
func rangeAccess() int { | |
sum := 0 | |
for _, ch := range testSlice { | |
sum += int(ch) | |
} | |
return sum | |
} | |
func arrayAccess() int { | |
return int(testSlice[0]) + int(testSlice[1]) | |
} | |
func BenchmarkArray(b *testing.B) { | |
for i := 0; i < b.N; i++ { | |
arrayAccess() | |
} | |
} | |
func BenchmarkRange(b *testing.B) { | |
for i := 0; i < b.N; i++ { | |
rangeAccess() | |
} | |
} | |
// BenchmarkArray-10 1000000000 0.3146 ns/op | |
// BenchmarkRange-10 625083966 1.888 ns/op |
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main.rangeAccess STEXT nosplit size=80 args=0x0 locals=0x18 funcid=0x0 align=0x0 leaf | |
0x0000 00000 (range_test.go:7) TEXT main.rangeAccess(SB), NOSPLIT|LEAF|ABIInternal, $32-0 | |
0x0000 00000 (range_test.go:7) MOVD.W R30, -32(RSP) | |
0x0004 00004 (range_test.go:7) MOVD R29, -8(RSP) | |
0x0008 00008 (range_test.go:7) SUB $8, RSP, R29 | |
0x000c 00012 (range_test.go:7) FUNCDATA ZR, gclocals·g2BeySu+wFnoycgXfElmcg==(SB) | |
0x000c 00012 (range_test.go:7) FUNCDATA $1, gclocals·g2BeySu+wFnoycgXfElmcg==(SB) | |
0x000c 00012 (range_test.go:7) PCDATA $0, $-3 | |
0x000c 00012 (range_test.go:9) MOVHU main.testSlice(SB), R1 | |
0x0018 00024 (range_test.go:9) PCDATA $0, $-1 | |
0x0018 00024 (range_test.go:9) MOVH R1, main..autotmp_3-2(SP) | |
0x001c 00028 (range_test.go:9) MOVD ZR, R0 | |
0x0020 00032 (range_test.go:9) MOVD ZR, R1 | |
0x0024 00036 (range_test.go:9) JMP 56 | |
0x0028 00040 (range_test.go:9) MOVD $main..autotmp_3-2(SP), R2 | |
0x002c 00044 (range_test.go:9) MOVBU (R2)(R0), R2 | |
0x0030 00048 (range_test.go:9) ADD $1, R0, R0 | |
0x0034 00052 (range_test.go:10) ADD R1, R2, R1 | |
0x0038 00056 (range_test.go:9) CMP $2, R0 | |
0x003c 00060 (range_test.go:9) BLT 40 | |
0x0040 00064 (range_test.go:12) MOVD R1, R0 | |
0x0044 00068 (range_test.go:12) ADD $32, RSP | |
0x0048 00072 (range_test.go:12) SUB $8, RSP, R29 | |
0x004c 00076 (range_test.go:12) RET (R30) | |
0x0000 fe 0f 1e f8 fd 83 1f f8 fd 23 00 d1 1b 00 00 90 .........#...... | |
0x0010 7b 03 00 91 61 03 40 79 e1 2f 00 79 00 00 80 d2 {...a.@y./.y.... | |
0x0020 01 00 80 d2 05 00 00 14 e2 5b 00 91 42 68 60 38 .........[..Bh`8 | |
0x0030 00 04 00 91 41 00 01 8b 1f 08 00 f1 6b ff ff 54 ....A.......k..T | |
0x0040 e0 03 01 aa ff 83 00 91 fd 23 00 d1 c0 03 5f d6 .........#...._. | |
rel 12+8 t=3 main.testSlice+0 | |
main.arrayAccess STEXT size=32 args=0x0 locals=0x0 funcid=0x0 align=0x0 leaf | |
0x0000 00000 (range_test.go:15) TEXT main.arrayAccess(SB), LEAF|NOFRAME|ABIInternal, $0-0 | |
0x0000 00000 (range_test.go:15) FUNCDATA ZR, gclocals·g2BeySu+wFnoycgXfElmcg==(SB) | |
0x0000 00000 (range_test.go:15) FUNCDATA $1, gclocals·g2BeySu+wFnoycgXfElmcg==(SB) | |
0x0000 00000 (range_test.go:15) PCDATA $0, $-3 | |
0x0000 00000 (range_test.go:16) MOVBU main.testSlice(SB), R1 | |
0x000c 00012 (range_test.go:16) PCDATA $0, $-4 | |
0x000c 00012 (range_test.go:16) MOVBU main.testSlice+1(SB), R2 | |
0x0018 00024 (range_test.go:16) PCDATA $0, $-1 | |
0x0018 00024 (range_test.go:16) ADD R2, R1, R0 | |
0x001c 00028 (range_test.go:16) RET (R30) | |
0x0000 1b 00 00 90 7b 03 00 91 61 03 40 39 1b 00 00 90 ....{...a.@9.... | |
0x0010 7b 03 00 91 62 03 40 39 20 00 02 8b c0 03 5f d6 {...b.@9 ....._. | |
rel 0+8 t=3 main.testSlice+0 | |
rel 12+8 t=3 main.testSlice+1 |
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