+#!perl -T
+
+use strict;
+use warnings;
+
+use Test::More tests => 11 + 6 * 3;
+
+{
+ my $desc = 'peephole optimization of conditionals';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ if ($_[0]) {
+ my $z = $x->{a};
+ return 1;
+ } elsif ($_[1] || $_[2]) {
+ my $z = $x->{b};
+ return 2;
+ } elsif ($_[3] && $_[4]) {
+ my $z = $x->{c};
+ return 3;
+ } elsif ($_[5] ? $_[6] : 0) {
+ my $z = $x->{d};
+ return 4;
+ } else {
+ my $z = $x->{e};
+ return 5;
+ }
+ return 0;
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->(1);
+ is_deeply $x, undef, "$desc : first branch did not autovivify";
+ is $ret, 1, "$desc : first branch returned 1";
+
+ $ret = $code->(0, 1);
+ is_deeply $x, undef, "$desc : second branch did not autovivify";
+ is $ret, 2, "$desc : second branch returned 2";
+
+ $ret = $code->(0, 0, 0, 1, 1);
+ is_deeply $x, undef, "$desc : third branch did not autovivify";
+ is $ret, 3, "$desc : third branch returned 3";
+
+ $ret = $code->(0, 0, 0, 0, 0, 1, 1);
+ is_deeply $x, undef, "$desc : fourth branch did not autovivify";
+ is $ret, 4, "$desc : fourth branch returned 4";
+
+ $ret = $code->();
+ is_deeply $x, undef, "$desc : fifth branch did not autovivify";
+ is $ret, 5, "$desc : fifth branch returned 5";
+}
+
+{
+ my $desc = 'peephole optimization of C-style loops';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ my $ret = 0;
+ for (
+ my ($z, $i) = ($x->[100], 0)
+ ;
+ do { my $z = $x->[200]; $i < 4 }
+ ;
+ do { my $z = $x->[300]; ++$i }
+ ) {
+ my $z = $x->[$i];
+ $ret += $i;
+ }
+ return $ret;
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->();
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, 6, "$desc returned 0+1+2+3";
+}
+
+{
+ my $desc = 'peephole optimization of range loops';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ my $ret = 0;
+ for ((do { my $z = $x->[100]; 0 }) .. (do { my $z = $x->[200]; 3 })) {
+ my $z = $x->[$_];
+ $ret += $_;
+ }
+ return $ret;
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->();
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, 6, "$desc returned 0+1+2+3";
+}
+
+{
+ my $desc = 'peephole optimization of empty loops (RT #64435)';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ my $ret = 0;
+ for (;;) {
+ ++$ret;
+ return $ret;
+ }
+ return $ret;
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->();
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, 1, "$desc returned 1";
+}
+
+{
+ my $desc = 'peephole optimization of map';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ join ':', map {
+ my $z = $x->[$_];
+ "x${_}y"
+ } @_
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->(1, 2);
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, 'x1y:x2y', "$desc returned the right value";
+}
+
+{
+ my $desc = 'peephole optimization of grep';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ join ':', grep {
+ my $z = $x->[$_];
+ $_ <= 3
+ } @_
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->(1 .. 5);
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, '1:2:3', "$desc returned the right value";
+}
+
+{
+ my $desc = 'peephole optimization of substitutions';
+ my $x;
+
+ local $@;
+ my $code = eval <<' TESTCASE';
+ no autovivification;
+ sub {
+ my $str = $_[0];
+ $str =~ s{
+ ([0-9])
+ }{
+ my $z = $x->[$1];
+ 9 - $1;
+ }xge;
+ $str;
+ }
+ TESTCASE
+ is $@, '', "$desc compiled fine";
+
+ my $ret = $code->('0123456789');
+ is_deeply $x, undef, "$desc did not autovivify";
+ is $ret, '9876543210', "$desc returned the right value";
+}