reduce_append_bytecode.java

/* The following are decompiled classes for the snippet (fn [b x] (chunk-append b (f x)) b)
   In the the first case, the snippet was part of AOT+directlinking compilation. The second evaluated at the REPL
   as lambda function inside a (reduce) operation. All as expected, but benchmarks for the non-AOT non-directlinked are
   faster and can't explain why it should be. Faster as in 30-40% faster (criterium-bench). */

// 1. AOT compiled + direct linking
public final class clojure.core$map$fn__5678$fn__5679 extends clojure.lang.AFunction {

  // Field descriptor #7 Ljava/lang/Object;
  java.lang.Object f;

  // Method descriptor #9 (Ljava/lang/Object;)V
  // Stack: 2, Locals: 2
  public core$map$fn__5678$fn__5679(java.lang.Object arg0);
     0  aload_0 [this]
     1  invokespecial clojure.lang.AFunction() [12]
     4  aload_0 [this]
     5  aload_1 [arg0]
     6  putfield clojure.core$map$fn__5678$fn__5679.f : java.lang.Object [14]
     9  return
      Line numbers:
        [pc: 0, line: 2743]

  // Method descriptor #16 (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
  // Stack: 4, Locals: 3
  public java.lang.Object invoke(java.lang.Object b, java.lang.Object x);
     0  aload_1 [b]
     1  aload_0 [this]
     2  getfield clojure.core$map$fn__5678$fn__5679.f : java.lang.Object [14]
     5  checkcast clojure.lang.IFn [18]
     8  aload_2 [x]
     9  aconst_null
    10  astore_2 [x]
    11  invokeinterface clojure.lang.IFn.invoke(java.lang.Object) : java.lang.Object [21] [nargs: 2]
    16  invokestatic clojure.core$chunk_append.invokeStatic(java.lang.Object, java.lang.Object) : java.lang.Object [26]
    19  pop
    20  aload_1 [b]
    21  aconst_null
    22  astore_1 [b]
    23  areturn
      Line numbers:
        [pc: 0, line: 2743]
        [pc: 5, line: 2743]
        [pc: 11, line: 2743]
      Local variable table:
        [pc: 0, pc: 23] local: this index: 0 type: java.lang.Object
        [pc: 0, pc: 23] local: b index: 1 type: java.lang.Object
        [pc: 0, pc: 23] local: x index: 2 type: java.lang.Object

  // Method descriptor #10 ()V
  // Stack: 0, Locals: 0
  public static {};
    0  return
      Line numbers:
        [pc: 0, line: 2743]

}

// 2. Same code, evaluated at the REPL (no AOT no direct linking)
public final class user$cmap$fn__27424$fn__27425 extends clojure.lang.AFunction {

  // Field descriptor #7 Ljava/lang/Object;
  java.lang.Object f;

  // Field descriptor #18 Lclojure/lang/Var;
  public static final clojure.lang.Var const__0;

  // Method descriptor #9 (Ljava/lang/Object;)V
  // Stack: 2, Locals: 2
  public user$cmap$fn__27424$fn__27425(java.lang.Object arg0);
     0  aload_0 [this]
     1  invokespecial clojure.lang.AFunction() [12]
     4  aload_0 [this]
     5  aload_1 [arg0]
     6  putfield user$cmap$fn__27424$fn__27425.f : java.lang.Object [14]
     9  return
      Line numbers:
        [pc: 0, line: 7]

  // Method descriptor #16 (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
  // Stack: 5, Locals: 3
  public java.lang.Object invoke(java.lang.Object b, java.lang.Object x);
     0  getstatic user$cmap$fn__27424$fn__27425.const__0 : clojure.lang.Var [20]
     3  invokevirtual clojure.lang.Var.getRawRoot() : java.lang.Object [26]
     6  checkcast clojure.lang.IFn [28]
     9  aload_1 [b]
    10  aload_0 [this]
    11  getfield user$cmap$fn__27424$fn__27425.f : java.lang.Object [14]
    14  checkcast clojure.lang.IFn [28]
    17  aload_2 [x]
    18  aconst_null
    19  astore_2 [x]
    20  invokeinterface clojure.lang.IFn.invoke(java.lang.Object) : java.lang.Object [31] [nargs: 2]
    25  invokeinterface clojure.lang.IFn.invoke(java.lang.Object, java.lang.Object) : java.lang.Object [33] [nargs: 3]
    30  pop
    31  aload_1 [b]
    32  aconst_null
    33  astore_1 [b]
    34  areturn
      Line numbers:
        [pc: 0, line: 7]
        [pc: 6, line: 7]
        [pc: 14, line: 7]
        [pc: 20, line: 7]
        [pc: 25, line: 7]
      Local variable table:
        [pc: 0, pc: 34] local: this index: 0 type: java.lang.Object
        [pc: 0, pc: 34] local: b index: 1 type: java.lang.Object
        [pc: 0, pc: 34] local: x index: 2 type: java.lang.Object

  // Method descriptor #10 ()V
  // Stack: 2, Locals: 0
  public static {};
     0  ldc <String "clojure.core"> [39]
     2  ldc <String "chunk-append"> [41]
     4  invokestatic clojure.lang.RT.var(java.lang.String, java.lang.String) : clojure.lang.Var [47]
     7  checkcast clojure.lang.Var [22]
    10  putstatic user$cmap$fn__27424$fn__27425.const__0 : clojure.lang.Var [20]
    13  return
      Line numbers:
        [pc: 0, line: 7]

}