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unicode: improve SimpleFold performance for ascii

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This change significantly speeds up case-insensitive regexp matching.

benchmark                      old ns/op      new ns/op      delta
BenchmarkMatchEasy0i_32-8      2690           1473           -45.24%
BenchmarkMatchEasy0i_1K-8      80404          42269          -47.43%
BenchmarkMatchEasy0i_32K-8     3272187        2076118        -36.55%
BenchmarkMatchEasy0i_1M-8      104805990      66503805       -36.55%
BenchmarkMatchEasy0i_32M-8     3360192200     2126121600     -36.73%

benchmark                      old MB/s     new MB/s     speedup
BenchmarkMatchEasy0i_32-8      11.90        21.72        1.83x
BenchmarkMatchEasy0i_1K-8      12.74        24.23        1.90x
BenchmarkMatchEasy0i_32K-8     10.01        15.78        1.58x
BenchmarkMatchEasy0i_1M-8      10.00        15.77        1.58x
BenchmarkMatchEasy0i_32M-8     9.99         15.78        1.58x

Issue #13288

Change-Id: I94af7bb29e75d60b4f6ee760124867ab271b9642
Reviewed-on: https://go-review.googlesource.com/16943
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Egon Elbre 2015-11-17 16:51:23 +02:00 • committed by Brad Fitzpatrick
parent 6e4a8615f6
commit e607abbfd6
4 changed files with 161 additions and 0 deletions
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6
src/regexp/exec_test.go
View file

@ -672,6 +672,7 @@ func benchmark(b *testing.B, re string, n int) {
const (
easy0 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
easy0i = "(?i)ABCDEFGHIJklmnopqrstuvwxyz$"
easy1 = "A[AB]B[BC]C[CD]D[DE]E[EF]F[FG]G[GH]H[HI]I[IJ]J$"
medium = "[XYZ]ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
hard = "[ -~]*ABCDEFGHIJKLMNOPQRSTUVWXYZ$"
@ -682,6 +683,11 @@ func BenchmarkMatchEasy0_1K(b *testing.B) { benchmark(b, easy0, 1<<10) }
func BenchmarkMatchEasy0_32K(b *testing.B) { benchmark(b, easy0, 32<<10) }
func BenchmarkMatchEasy0_1M(b *testing.B) { benchmark(b, easy0, 1<<20) }
func BenchmarkMatchEasy0_32M(b *testing.B) { benchmark(b, easy0, 32<<20) }
func BenchmarkMatchEasy0i_32(b *testing.B) { benchmark(b, easy0i, 32<<0) }
func BenchmarkMatchEasy0i_1K(b *testing.B) { benchmark(b, easy0i, 1<<10) }
func BenchmarkMatchEasy0i_32K(b *testing.B) { benchmark(b, easy0i, 32<<10) }
func BenchmarkMatchEasy0i_1M(b *testing.B) { benchmark(b, easy0i, 1<<20) }
func BenchmarkMatchEasy0i_32M(b *testing.B) { benchmark(b, easy0i, 32<<20) }
func BenchmarkMatchEasy1_32(b *testing.B) { benchmark(b, easy1, 32<<0) }
func BenchmarkMatchEasy1_1K(b *testing.B) { benchmark(b, easy1, 1<<10) }
func BenchmarkMatchEasy1_32K(b *testing.B) { benchmark(b, easy1, 32<<10) }