peephole optimization for LOADNIL before STRCAT; ref #3110

819c9da8 · Yukihiro "Matz" Matsumoto · d8fc09cf · 819c9da8
Commit 819c9da8 authored Feb 17, 2016 by Yukihiro "Matz" Matsumoto
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mrbgems/mruby-compiler/core/codegen.c mrbgems/mruby-compiler/core/codegen.c +6 -0

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--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -339,6 +339,12 @@ genop_peep(codegen_scope *s, mrb_code i, int val)
          return 0;
        }
      }
+      if (c0 == OP_LOADNIL) {
+        if (GETARG_B(i) == GETARG_A(i0)) {
+          s->pc--;
+          return 0;
+        }
+      }
      break;
    case OP_JMPIF:
    case OP_JMPNOT: