test-wildmatch: add "perf" command to compare wildmatch and fnmatch

test-wildmatch: add "perf" command to compare wildmatch and fnmatch

It takes a text file, a pattern, a number <n> and pathname flag. Each
line in the text file is matched against the pattern <n> times. If
"pathname" is given, FNM_PATHNAME is used.

test-wildmatch is built with -O2 and tested against glibc 2.14.1 (also
-O2) and compat/fnmatch. The input file is linux-2.6.git file list.
<n> is 2000. The complete command list is at the end.

wildmatch is beaten in the following cases. Apparently it needs some
improvement in FNM_PATHNAME case:

glibc, '*/*/*' with FNM_PATHNAME:
wildmatch 8s 1559us
fnmatch   1s 11877us or 12.65% faster

compat, '*/*/*' with FNM_PATHNAME:
wildmatch 7s 922458us
fnmatch   2s 905111us or 36.67% faster

compat, '*/*/*' without FNM_PATHNAME:
wildmatch 7s 264201us
fnmatch   2s 1897us or 27.56% faster

compat, '[a-z]*/[a-z]*/[a-z]*' with FNM_PATHNAME:
wildmatch 8s 742827us
fnmatch   0s 922943us or 10.56% faster

compat, '[a-z]*/[a-z]*/[a-z]*' without FNM_PATHNAME:
wildmatch 8s 284520us
fnmatch   0s 6936us or 0.08% faster

The rest of glibc numbers
-------------------------

'Documentation/*'
wildmatch 1s 529479us
fnmatch   1s 98263us or 71.81% slower

'drivers/*'
wildmatch 1s 988288us
fnmatch   1s 192049us or 59.95% slower

'Documentation/*' pathname
wildmatch 1s 557507us
fnmatch   1s 93696us or 70.22% slower

'drivers/*' pathname
wildmatch 2s 161626us
fnmatch   1s 230372us or 56.92% slower

'[Dd]ocu[Mn]entation/*'
wildmatch 1s 776581us
fnmatch   1s 471693us or 82.84% slower

'[Dd]o?u[Mn]en?ati?n/*'
wildmatch 1s 770770us
fnmatch   1s 555727us or 87.86% slower

'[Dd]o?u[Mn]en?ati?n/*' pathname
wildmatch 1s 783507us
fnmatch   1s 537029us or 86.18% slower

'[A-Za-z][A-Za-z]??*'
wildmatch 4s 110386us
fnmatch   4s 926306us or 119.85% slower

'[A-Za-z][A-Za-z]??'
wildmatch 3s 918114us
fnmatch   3s 686175us or 94.08% slower

'[A-Za-z][A-Za-z]??*' pathname
wildmatch 4s 453746us
fnmatch   4s 955856us or 111.27% slower

'[A-Za-z][A-Za-z]??' pathname
wildmatch 3s 896646us
fnmatch   3s 733828us or 95.82% slower

'*/*/*'
wildmatch 7s 287985us
fnmatch   1s 74083us or 14.74% slower

'[a-z]*/[a-z]*/[a-z]*' pathname
wildmatch 8s 796659us
fnmatch   1s 568409us or 17.83% slower

'[a-z]*/[a-z]*/[a-z]*'
wildmatch 8s 316559us
fnmatch   3s 430652us or 41.25% slower

The rest of compat numbers
--------------------------

'Documentation/*'
wildmatch 1s 520389us
fnmatch   0s 62579us or 4.12% slower

'drivers/*'
wildmatch 1s 955354us
fnmatch   0s 190109us or 9.72% slower

'Documentation/*' pathname
wildmatch 1s 561675us
fnmatch   0s 55336us or 3.54% slower

'drivers/*' pathname
wildmatch 2s 106100us
fnmatch   0s 219680us or 10.43% slower

'[Dd]ocu[Mn]entation/*'
wildmatch 1s 750810us
fnmatch   0s 542721us or 31.00% slower

'[Dd]o?u[Mn]en?ati?n/*'
wildmatch 1s 724791us
fnmatch   0s 538948us or 31.25% slower

'[Dd]o?u[Mn]en?ati?n/*' pathname
wildmatch 1s 731403us
fnmatch   0s 537474us or 31.04% slower

'[A-Za-z][A-Za-z]??*'
wildmatch 4s 28555us
fnmatch   1s 67297us or 26.49% slower

'[A-Za-z][A-Za-z]??'
wildmatch 3s 838279us
fnmatch   0s 880005us or 22.93% slower

'[A-Za-z][A-Za-z]??*' pathname
wildmatch 4s 379476us
fnmatch   1s 55643us or 24.10% slower

'[A-Za-z][A-Za-z]??' pathname
wildmatch 3s 830910us
fnmatch   0s 849699us or 22.18% slower

The following commands are used:

LANG=C ./test-wildmatch perf /tmp/filelist.txt 'Documentation/*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt 'drivers/*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt 'Documentation/*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt 'drivers/*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[Dd]ocu[Mn]entation/*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[Dd]o?u[Mn]en?ati?n/*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[Dd]o?u[Mn]en?ati?n/*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[A-Za-z][A-Za-z]??*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[A-Za-z][A-Za-z]??' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[A-Za-z][A-Za-z]??*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[A-Za-z][A-Za-z]??' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '*/*/*' 2000
LANG=C ./test-wildmatch perf /tmp/filelist.txt '*/*/*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[a-z]*/[a-z]*/[a-z]*' 2000 pathname
LANG=C ./test-wildmatch perf /tmp/filelist.txt '[a-z]*/[a-z]*/[a-z]*' 2000

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>