From 609939f8c6cb595eaa7d36eee030e8c10c6f6ad9 Mon Sep 17 00:00:00 2001
From: normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 6 Jun 2018 20:57:48 +0000
Subject: rb_vm_insn_addr2insn: use st to perform addr2insn mapping

The current VM_INSTRUCTION_SIZE is 198, so the linear search
painful during a major GC phase.

I noticed rb_vm_insn_addr2insn2 showing up at the top of some
profiles while working on some malloc-related stuff, so I
decided to attack it.

Most notably, the benchmark/bm_vm3_gc.rb improves by over 40%:

  https://80x24.org/spew/20180602220554.GA9991@whir/raw

[ruby-core:87361] [Feature #14814]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63594 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_core.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'vm_core.h')

diff --git a/vm_core.h b/vm_core.h
index 8e34ff14a5..0a185a6ceb 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -144,6 +144,11 @@ void *rb_register_sigaltstack(void);
 #endif /* OPT_STACK_CACHING */
 #endif /* OPT_CALL_THREADED_CODE */
 
+#if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
+void rb_addr2insn_init(void);
+#else
+static inline void rb_addr2insn_init(void) { }
+#endif
 typedef unsigned long rb_num_t;
 typedef   signed long rb_snum_t;
 
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