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URL: http://github.com/jruby/jruby/issues/9320

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Cannot run code that has large Integer in `when` clause · Issue #9320 · jruby/jruby · GitHub
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Cannot run code that has large Integer in when clause #9320

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Open
Cannot run code that has large Integer in when clause#9320
@tompng

Description

@tompng
tompng
opened on Mar 20, 2026

Compiling ruby code that has large Integer in when clause raises org.jruby.compiler.NotCompilableException: optimized case has long-ranged value

case a
when 10000000000
end

Integer range that fail to compile is 0x80000000..0x7fffffffffffffff

Environment Information

$ ruby -v
jruby 10.0.4.0 (3.4.5) 2026-03-03 9af05b916f Java HotSpot(TM) 64-Bit Server VM 24.0.2+12-54 on 24.0.2+12-54 +indy +jit [arm64-darwin]

Expected Behavior

No error raised

Actual Behavior

Result

JRuby.compile_ir "case a\nwhen 10000000000\nend"
#=> org.jruby.dist/org.jruby.ir.builder.IRBuilderAST.notCompilable(IRBuilderAST.java:169): optimized case has long-ranged value (CaseNode - :0). (Java::OrgJrubyCompiler::NotCompilableException)
$ ruby -e "if false; case 1; when 10000000000; end; end"
Unhandled Java exception: org.jruby.compiler.NotCompilableException: optimized case has long-ranged value (CaseNode - -e:0).
org.jruby.compiler.NotCompilableException: optimized case has long-ranged value (CaseNode - -e:0).
            notCompilable at org/jruby/ir/builder/IRBuilderAST.java:169
  gatherLiteralWhenBodies at org/jruby/ir/builder/IRBuilderAST.java:1199
   buildOptimizedCaseWhen at org/jruby/ir/builder/IRBuilderAST.java:1164
                buildCase at org/jruby/ir/builder/IRBuilderAST.java:1055
             buildOperand at org/jruby/ir/builder/IRBuilderAST.java:188
                    build at org/jruby/ir/builder/IRBuilderAST.java:296
                    build at org/jruby/ir/builder/IRBuilderAST.java:280
                    build at org/jruby/ir/builder/IRBuilderAST.java:127
         buildConditional at org/jruby/ir/builder/IRBuilder.java:1216
                  buildIf at org/jruby/ir/builder/IRBuilderAST.java:2364
             buildOperand at org/jruby/ir/builder/IRBuilderAST.java:218
                    build at org/jruby/ir/builder/IRBuilderAST.java:296
                    build at org/jruby/ir/builder/IRBuilderAST.java:280
                    build at org/jruby/ir/builder/IRBuilderAST.java:158
           buildRootInner at org/jruby/ir/builder/IRBuilder.java:276
                buildRoot at org/jruby/ir/builder/IRBuilder.java:167
                  execute at org/jruby/ir/IRTranslator.java:28
           runInterpreter at org/jruby/Ruby.java:1242
           runInterpreter at org/jruby/Ruby.java:1272
              runNormally at org/jruby/Ruby.java:1146
              runFromMain at org/jruby/Ruby.java:986
              internalRun at org/jruby/main/Main.java:289
                      run at org/jruby/main/Main.java:239
                     main at org/jruby/main/Main.java:211

This was found in ruby/bigdecimal's ci failure of a draft pull request.
Actual code and workaround:
https://github.com/tompng/bigdecimal/blob/b366afb471c9b2b3c6fc4f5b47634def329895fd/test/bigdecimal/helper.rb#L8-L13

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