test/micro/org/openjdk/bench/java/lang/StringConcat.java

rev 54622 : 8222852: Reduce String concat combinator tree shapes by folding constants into prependers
Reviewed-by: shade, plevart
Contributed-by: claes.redestad@oracle.com, peter.levart@gmail.com

*** 76,90 ****
--- 76,105 ----
      public String concatConstStringConstInt() {
          return "string" + stringValue + "string" + intValue;
      }
  
      @Benchmark
+     public String concatMix4String() {
+         // Investigate "profile pollution" between shared LFs that might eliminate some JIT optimizations
+         String s1 = "string" + stringValue + stringValue + stringValue + stringValue;
+         String s2 = "string" + stringValue + "string" + stringValue + stringValue + stringValue;
+         String s3 = stringValue + stringValue + "string" + stringValue + "string" + stringValue + "string";
+         String s4 = "string" + stringValue + "string" + stringValue + "string" + stringValue + "string" + stringValue + "string";
+         return s1 + s2 + s3 + s4;
+     }
+ 
+     @Benchmark
      public String concatConst4String() {
          return "string" + stringValue + stringValue + stringValue + stringValue;
      }
  
      @Benchmark
+     public String concat4String() {
+         return stringValue + stringValue + stringValue + stringValue;
+     }
+ 
+     @Benchmark
      public String concatConst2String() {
          return "string" + stringValue + stringValue;
      }
  
      @Benchmark
*** 96,105 ****
--- 111,125 ----
      public String concatConst6String() {
          return "string" + stringValue + stringValue + stringValue + stringValue + stringValue + stringValue;
      }
  
      @Benchmark
+     public String concat6String() {
+         return stringValue + stringValue + stringValue + stringValue + stringValue + stringValue;
+     }
+ 
+     @Benchmark
      public String concatConst6Object() {
          return "string" + objectValue + objectValue + objectValue + objectValue + objectValue + objectValue;
      }
  
  }