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vm: don't use PushVal when item type is known

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PushVal is very convenient, but type switch is somewhat expensive.

name                    old time/op    new time/op    delta
ScriptFibonacci-8          736µs ± 1%     602µs ± 1%  -18.21%  (p=0.000 n=9+10)
ScriptNestedRefCount-8    1.08ms ± 2%    0.96ms ± 1%  -11.13%  (p=0.000 n=10+10)
ScriptPushPop/4-8         1.48µs ± 3%    1.35µs ± 2%   -9.14%  (p=0.000 n=10+9)
ScriptPushPop/16-8        3.59µs ± 1%    3.38µs ± 1%   -6.01%  (p=0.000 n=10+10)
ScriptPushPop/128-8       23.7µs ± 1%    22.6µs ± 1%   -4.39%  (p=0.000 n=10+8)
ScriptPushPop/1024-8       176µs ± 2%     167µs ± 3%   -5.24%  (p=0.000 n=9+10)

name                    old alloc/op   new alloc/op   delta
ScriptFibonacci-8          123kB ± 0%     114kB ± 0%   -6.88%  (p=0.000 n=10+9)
ScriptNestedRefCount-8     266kB ± 0%     241kB ± 0%   -9.23%  (p=0.000 n=8+10)
ScriptPushPop/4-8           160B ± 0%      160B ± 0%     ~     (all equal)
ScriptPushPop/16-8          640B ± 0%      640B ± 0%     ~     (all equal)
ScriptPushPop/128-8       8.70kB ± 0%    8.70kB ± 0%     ~     (all equal)
ScriptPushPop/1024-8      73.2kB ± 0%    73.2kB ± 0%     ~     (all equal)

name                    old allocs/op  new allocs/op  delta
ScriptFibonacci-8          3.53k ± 0%     3.17k ± 0%   -9.98%  (p=0.000 n=10+10)
ScriptNestedRefCount-8     11.8k ± 0%     10.7k ± 0%   -8.70%  (p=0.000 n=10+10)
ScriptPushPop/4-8           8.00 ± 0%      8.00 ± 0%     ~     (all equal)
ScriptPushPop/16-8          32.0 ± 0%      32.0 ± 0%     ~     (all equal)
ScriptPushPop/128-8          259 ± 0%       259 ± 0%     ~     (all equal)
ScriptPushPop/1024-8       2.05k ± 0%     2.05k ± 0%     ~     (all equal)
This commit is contained in:
Roman Khimov 2021-08-28 22:35:43 +03:00
parent bc31c97c32
commit a3892aa662
3 changed files with 82 additions and 72 deletions
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5
pkg/vm/stack.go
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@ -170,6 +170,11 @@ func (s *Stack) Push(e Element) {
s.refs.Add(e.value)
}
// PushItem pushed an Item to the stack.
func (s *Stack) PushItem(i stackitem.Item) {
s.Push(Element{i})
}
// PushVal pushes the given value on the stack. It will infer the
// underlying Item to its corresponding type.
func (s *Stack) PushVal(v interface{}) {