core/vm: allocate stack to 1024

obscuren · obscuren · commit 846d091bd25a · 2017-05-25T11:37:04.000+02:00
Pre allocate the stack to 1024 optimising stack pushing, reducing calls
to runtime.makeslice and runtime.mallocgc
diff --git a/core/vm/stack.go b/core/vm/stack.go
@@ -29,7 +29,7 @@ type Stack struct {
 }
 
 func newstack() *Stack {
-	return &Stack{}
+	return &Stack{data: make([]*big.Int, 0, 1024)}
 }
 
 func (st *Stack) Data() []*big.Int {

Original file line number	Diff line number	Diff line change
`@@ -29,7 +29,7 @@ type Stack struct {`
`29`	`29`	`}`
`30`	`30`
`31`	`31`	`func newstack() *Stack {`
`32`		`- return &Stack{}`
	`32`	`+ return &Stack{data: make([]*big.Int, 0, 1024)}`
`33`	`33`	`}`
`34`	`34`
`35`	`35`	`func (st Stack) Data() []big.Int {`