t/perf: factor out percent calculations

This will let us reuse the code when we add new values to
aggregate besides times.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/perf/aggregate.perl b/t/perf/aggregate.perl
index bc865160e7e3370f9462beda9d8b3866e3c2111b..3181b087ab5d2624ae64c951600eefe93d21d78c 100755 (executable)
--- a/t/perf/aggregate.perl
+++ b/t/perf/aggregate.perl
@@ -19,21 +19,24 @@ sub get_times {
        return ($rt, $4, $5);
 }
 
+sub relative_change {
+       my ($r, $firstr) = @_;
+       if ($firstr > 0) {
+               return sprintf "%+.1f%%", 100.0*($r-$firstr)/$firstr;
+       } elsif ($r == 0) {
+               return "=";
+       } else {
+               return "+inf";
+       }
+}
+
 sub format_times {
        my ($r, $u, $s, $firstr) = @_;
        if (!defined $r) {
                return "<missing>";
        }
        my $out = sprintf "%.2f(%.2f+%.2f)", $r, $u, $s;
-       if (defined $firstr) {
-               if ($firstr > 0) {
-                       $out .= sprintf " %+.1f%%", 100.0*($r-$firstr)/$firstr;
-               } elsif ($r == 0) {
-                       $out .= " =";
-               } else {
-                       $out .= " +inf";
-               }
-       }
+       $out .= ' ' . relative_change($r, $firstr) if defined $firstr;
        return $out;
 }