From b736ea63bd4ce4e2fc81dfa73938b39fa70f659c Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@gmail.com>
Date: Mon, 30 Mar 2020 22:27:01 -0700
Subject: Optimize exivar access on JIT-ed getivar

JIT support of dd723771c11.

$ benchmark-driver -v --rbenv 'before;before --jit;after --jit' benchmark/mjit_exivar.yml --repeat-count=4
before: ruby 2.8.0dev (2020-03-30T12:32:26Z master e5db3da9d3) [x86_64-linux]
before --jit: ruby 2.8.0dev (2020-03-30T12:32:26Z master e5db3da9d3) +JIT [x86_64-linux]
after --jit: ruby 2.8.0dev (2020-03-31T05:57:24Z mjit-exivar 128625baec) +JIT [x86_64-linux]
Calculating -------------------------------------
                         before  before --jit  after --jit
         mjit_exivar    57.944M       53.579M      54.471M i/s -    200.000M times in 3.451588s 3.732772s 3.671687s

Comparison:
                      mjit_exivar
              before:  57944345.1 i/s
         after --jit:  54470876.7 i/s - 1.06x  slower
        before --jit:  53579483.4 i/s - 1.08x  slower
---
 benchmark/mjit_exivar.yml | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 benchmark/mjit_exivar.yml

(limited to 'benchmark')

diff --git a/benchmark/mjit_exivar.yml b/benchmark/mjit_exivar.yml
new file mode 100644
index 0000000000..052ca46ff9
--- /dev/null
+++ b/benchmark/mjit_exivar.yml
@@ -0,0 +1,32 @@
+prelude: |
+  # frozen_string_literal: true
+  class Bench < Hash
+    def initialize
+      @exivar = nil
+    end
+
+    def exivar
+      @exivar
+    end
+  end
+
+  bench = Bench.new
+
+  if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
+    jit_min_calls = 10000
+    i = 0
+    while i < jit_min_calls
+      bench.exivar
+      i += 1
+    end
+    RubyVM::MJIT.pause # compile (1)
+    # issue recompile
+    bench.exivar
+    RubyVM::MJIT.resume
+    RubyVM::MJIT.pause # compile (2)
+  end
+
+benchmark:
+  mjit_exivar: bench.exivar
+
+loop_count: 200000000
-- 
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