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+#!/bin/sh
+
+test_description="Comparison of git-grep's regex engines
+
+Set GIT_PERF_7820_GREP_OPTS in the environment to pass options to
+git-grep. Make sure to include a leading space,
+e.g. GIT_PERF_7820_GREP_OPTS=' -i'. Some options to try:
+
+ -i
+ -w
+ -v
+ -vi
+ -vw
+ -viw
+
+If GIT_PERF_GREP_THREADS is set to a list of threads (e.g. '1 4 8'
+etc.) we will test the patterns under those numbers of threads.
+"
+
+. ./perf-lib.sh
+
+test_perf_large_repo
+test_checkout_worktree
+
+if test -n "$GIT_PERF_GREP_THREADS"
+then
+ test_set_prereq PERF_GREP_ENGINES_THREADS
+fi
+
+for pattern in \
+ 'how.to' \
+ '^how to' \
+ '[how] to' \
+ '\(e.t[^ ]*\|v.ry\) rare' \
+ 'm\(ú\|u\)lt.b\(æ\|y\)te'
+do
+ for engine in basic extended perl
+ do
+ if test $engine != "basic"
+ then
+ # Poor man's basic -> extended converter.
+ pattern=$(echo "$pattern" | sed 's/\\//g')
+ fi
+ if test $engine = "perl" && ! test_have_prereq PCRE
+ then
+ prereq="PCRE"
+ else
+ prereq=""
+ fi
+ if ! test_have_prereq PERF_GREP_ENGINES_THREADS
+ then
+ test_perf "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern'" \
+ --prereq "$prereq" "
+ git -c grep.patternType=$engine grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine' || :
+ "
+ else
+ for threads in $GIT_PERF_GREP_THREADS
+ do
+ test_perf "$engine grep$GIT_PERF_7820_GREP_OPTS '$pattern' with $threads threads"
+ --prereq PTHREADS,$prereq "
+ git -c grep.patternType=$engine -c grep.threads=$threads grep$GIT_PERF_7820_GREP_OPTS -- '$pattern' >'out.$engine.$threads' || :
+ "
+ done
+ fi
+ done
+
+ if ! test_have_prereq PERF_GREP_ENGINES_THREADS
+ then
+ test_expect_success "assert that all engines found the same for$GIT_PERF_7820_GREP_OPTS '$pattern'" '
+ test_cmp out.basic out.extended &&
+ if test_have_prereq PCRE
+ then
+ test_cmp out.basic out.perl
+ fi
+ '
+ else
+ for threads in $GIT_PERF_GREP_THREADS
+ do
+ test_expect_success PTHREADS "assert that all engines found the same for$GIT_PERF_7820_GREP_OPTS '$pattern' under threading" "
+ test_cmp out.basic.$threads out.extended.$threads &&
+ if test_have_prereq PCRE
+ then
+ test_cmp out.basic.$threads out.perl.$threads
+ fi
+ "
+ done
+ fi
+done
+
+test_done