From 3c7c983300670b29e6c7feb3b8c23421c53af01b Mon Sep 17 00:00:00 2001
From: mame <mame@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Thu, 17 Mar 2016 12:47:31 +0000
Subject: * compile.c (NODE_CALL): add optimization shortcut for Array#max/min.
   Now `[x, y].max` is optimized so that a temporal array object is not  
 created in some condition.

* insns.def (opt_newarray_max, opt_newarray_min): added.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54153 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 insns.def | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

(limited to 'insns.def')

diff --git a/insns.def b/insns.def
index 98871bf9a6..5b08d0625a 100644
--- a/insns.def
+++ b/insns.def
@@ -986,6 +986,74 @@ opt_str_freeze
     }
 }
 
+DEFINE_INSN
+opt_newarray_max
+(rb_num_t num)
+(...)
+(VALUE val) // inc += 1 - num;
+{
+#define id_cmp  idCmp
+    if (BASIC_OP_UNREDEFINED_P(BOP_MAX, ARRAY_REDEFINED_OP_FLAG)) {
+	if (num == 0) {
+	    val = Qnil;
+	}
+	else {
+	    struct cmp_opt_data cmp_opt = { 0, 0 };
+	    VALUE result = Qundef;
+	    rb_num_t i = num - 1;
+	    result = TOPN(i);
+	    while (i-- > 0) {
+		const VALUE v = TOPN(i);
+		if (result == Qundef || OPTIMIZED_CMP(v, result, cmp_opt) > 0) {
+		    result = v;
+		}
+	    }
+	    val = result == Qundef ? Qnil : result;
+	}
+	POPN(num);
+    }
+    else {
+	VALUE ary = rb_ary_new4((long)num, STACK_ADDR_FROM_TOP(num));
+	val = rb_funcall(ary, idMax, 0);
+	POPN(num);
+    }
+#undef id_cmp
+}
+
+DEFINE_INSN
+opt_newarray_min
+(rb_num_t num)
+(...)
+(VALUE val) // inc += 1 - num;
+{
+#define id_cmp  idCmp
+    if (BASIC_OP_UNREDEFINED_P(BOP_MIN, ARRAY_REDEFINED_OP_FLAG)) {
+	if (num == 0) {
+	    val = Qnil;
+	}
+	else {
+	    struct cmp_opt_data cmp_opt = { 0, 0 };
+	    VALUE result = Qundef;
+	    rb_num_t i = num - 1;
+	    result = TOPN(i);
+	    while (i-- > 0) {
+		const VALUE v = TOPN(i);
+		if (result == Qundef || OPTIMIZED_CMP(v, result, cmp_opt) < 0) {
+		    result = v;
+		}
+	    }
+	    val = result == Qundef ? Qnil : result;
+	}
+	POPN(num);
+    }
+    else {
+	VALUE ary = rb_ary_new4((long)num, STACK_ADDR_FROM_TOP(num));
+	val = rb_funcall(ary, idMin, 0);
+	POPN(num);
+    }
+#undef id_cmp
+}
+
 /**
   @c optimize
   @e Invoke method without block
-- 
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