diff options
author | Aaron Patterson <tenderlove@ruby-lang.org> | 2019-06-04 16:29:08 -0700 |
---|---|---|
committer | Aaron Patterson <tenderlove@ruby-lang.org> | 2019-07-31 16:21:25 -0700 |
commit | 9faef3113fb4331524b81ba73005ba13fa0ef6c6 (patch) | |
tree | ad589031c32b94c96737445617931a6a389c456b /defs | |
parent | 117241b3c73f8f7f1bcfee34e9d627c41bb19cc9 (diff) | |
download | ruby-9faef3113fb4331524b81ba73005ba13fa0ef6c6.tar.gz |
Add a specialized instruction for `.nil?` calls
This commit adds a specialized instruction for called to `.nil?`. It is
about 27% faster than master in the case where the object is nil or not
nil. In the case where an object implements `nil?`, I think it may be
slightly slower. Here is a benchmark:
```ruby
require "benchmark/ips"
class Niller
def nil?; true; end
end
not_nil = Object.new
xnil = nil
niller = Niller.new
Benchmark.ips do |x|
x.report("nil?") { xnil.nil? }
x.report("not nil") { not_nil.nil? }
x.report("niller") { niller.nil? }
end
```
On Ruby master:
```
[aaron@TC ~/g/ruby (master)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 429.195k i/100ms
not nil 437.889k i/100ms
niller 437.935k i/100ms
Calculating -------------------------------------
nil? 20.166M (± 8.1%) i/s - 100.002M in 5.002794s
not nil 20.046M (± 7.6%) i/s - 99.839M in 5.020086s
niller 22.467M (± 6.1%) i/s - 112.111M in 5.013817s
[aaron@TC ~/g/ruby (master)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 449.660k i/100ms
not nil 433.836k i/100ms
niller 443.073k i/100ms
Calculating -------------------------------------
nil? 19.997M (± 8.8%) i/s - 99.375M in 5.020458s
not nil 20.529M (± 7.0%) i/s - 102.385M in 5.020689s
niller 21.796M (± 8.0%) i/s - 108.110M in 5.002300s
[aaron@TC ~/g/ruby (master)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 402.119k i/100ms
not nil 438.968k i/100ms
niller 398.226k i/100ms
Calculating -------------------------------------
nil? 20.050M (±12.2%) i/s - 98.519M in 5.008817s
not nil 20.614M (± 8.0%) i/s - 102.280M in 5.004531s
niller 22.223M (± 8.8%) i/s - 110.309M in 5.013106s
```
On this branch:
```
[aaron@TC ~/g/ruby (specialized-nilp)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 468.371k i/100ms
not nil 456.517k i/100ms
niller 454.981k i/100ms
Calculating -------------------------------------
nil? 27.849M (± 7.8%) i/s - 138.169M in 5.001730s
not nil 26.417M (± 8.7%) i/s - 131.020M in 5.011674s
niller 21.561M (± 7.5%) i/s - 107.376M in 5.018113s
[aaron@TC ~/g/ruby (specialized-nilp)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 477.259k i/100ms
not nil 428.712k i/100ms
niller 446.109k i/100ms
Calculating -------------------------------------
nil? 28.071M (± 7.3%) i/s - 139.837M in 5.016590s
not nil 25.789M (±12.9%) i/s - 126.470M in 5.011144s
niller 20.002M (±12.2%) i/s - 98.144M in 5.001737s
[aaron@TC ~/g/ruby (specialized-nilp)]$ ./ruby compil.rb
Warming up --------------------------------------
nil? 467.676k i/100ms
not nil 445.791k i/100ms
niller 415.024k i/100ms
Calculating -------------------------------------
nil? 26.907M (± 8.0%) i/s - 133.755M in 5.013915s
not nil 25.319M (± 7.9%) i/s - 125.713M in 5.007758s
niller 19.569M (±11.8%) i/s - 96.286M in 5.008533s
```
Co-Authored-By: Ashe Connor <kivikakk@github.com>
Diffstat (limited to 'defs')
-rw-r--r-- | defs/id.def | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/defs/id.def b/defs/id.def index 66dfdf915a..25677ffdc2 100644 --- a/defs/id.def +++ b/defs/id.def @@ -3,6 +3,7 @@ firstline, predefined = __LINE__+1, %[\ max min freeze + nil? inspect intern object_id |