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dd723771c1
vm_getivar() provides fastpath for T_OBJECT by caching an index
of ivar. This patch also provides fastpath for FL_EXIVAR objects.
FL_EXIVAR objects have an each ivar array and index can be cached
as T_OBJECT. To access this ivar array, generic_iv_tbl is exposed
by rb_ivar_generic_ivtbl() (declared in variable.h which is newly
introduced).
Benchmark script:
Benchmark.driver(repeat_count: 3){|x|
x.executable name: 'clean', command: %w'../clean/miniruby'
x.executable name: 'trunk', command: %w'./miniruby'
objs = [Object.new, 'str', {a: 1, b: 2}, [1, 2]]
objs.each.with_index{|obj, i|
rep = obj.inspect
rep = 'Object.new' if /\#/ =~ rep
x.prelude str = %Q{
v#{i} = #{rep}
def v#{i}.foo
@iv # ivar access method (attr_reader)
end
v#{i}.instance_variable_set(:@iv, :iv)
}
puts str
x.report %Q{
v#{i}.foo
}
}
}
Result:
v0.foo # T_OBJECT
clean: 85387141.8 i/s
trunk: 85249373.6 i/s - 1.00x slower
v1.foo # T_STRING
trunk: 57894407.5 i/s
clean: 39957178.6 i/s - 1.45x slower
v2.foo # T_HASH
trunk: 56629413.2 i/s
clean: 39227088.9 i/s - 1.44x slower
v3.foo # T_ARRAY
trunk: 55797530.2 i/s
clean: 38263572.9 i/s - 1.46x slower
9 lines
139 B
C
9 lines
139 B
C
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/* per-object */
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struct gen_ivtbl {
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uint32_t numiv;
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VALUE ivptr[FLEX_ARY_LEN];
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};
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struct st_table *rb_ivar_generic_ivtbl(void);
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