MJIT: Fix JIT code for multiple values in a single case

[Bug #19263]

2 files changed, 11 insertions, 1 deletions

diff --git a/lib/ruby_vm/mjit/compiler.rb b/lib/ruby_vm/mjit/compiler.rb
index 3ef3babf66..a9f2aeda8d 100644
--- a/lib/ruby_vm/mjit/compiler.rb
+++ b/lib/ruby_vm/mjit/compiler.rb
@@ -536,7 +536,7 @@ class RubyVM::MJIT::Compiler # :nodoc: all
       when /\A\s+JUMP\((?<dest>[^)]+)\);\s+\z/
         dest = Regexp.last_match[:dest]
         if insn.name == :opt_case_dispatch # special case... TODO: use another macro to avoid checking name
-          hash_offsets = C.rb_hash_values(operands[0])
+          hash_offsets = C.rb_hash_values(operands[0]).uniq
           else_offset = cast_offset(operands[1])
           base_pos = pos + insn_len
 
diff --git a/test/ruby/test_mjit.rb b/test/ruby/test_mjit.rb
index 399bf20071..a97747eb88 100644
--- a/test/ruby/test_mjit.rb
+++ b/test/ruby/test_mjit.rb
@@ -518,6 +518,16 @@ class TestMJIT < Test::Unit::TestCase
     end;
   end
 
+  def test_compile_multiple_values_case
+    assert_compile_twice("#{<<~"begin;"}\n#{<<~"end;"}", result_inspect: '"world"', insns: %i[opt_case_dispatch])
+    begin;
+      case 'hello'
+      when 'hello', 'world'
+        'world'
+      end
+    end;
+  end
+
   def test_compile_insn_opt_calc
     assert_compile_twice('4 + 2 - ((2 * 3 / 2) % 2)', result_inspect: '5', insns: %i[opt_plus opt_minus opt_mult opt_div opt_mod])
     assert_compile_twice('4.0 + 2.0 - ((2.0 * 3.0 / 2.0) % 2.0)', result_inspect: '5.0', insns: %i[opt_plus opt_minus opt_mult opt_div opt_mod])