core: vm: Optimize evm (#13)

* core: vm: add an EVM benchmark
* core: vm: optimize stack allocation and instruction for calculating 2^n
* Add DEXONBet bench

1 files changed, 14 insertions, 1 deletions

diff --git a/core/vm/stack.go b/core/vm/stack.go
index 4c1b9e803..14b1c289b 100644
--- a/core/vm/stack.go
+++ b/core/vm/stack.go
@@ -19,8 +19,15 @@ package vm
 import (
 	"fmt"
 	"math/big"
+	"sync"
 )
 
+var stackPool = sync.Pool{
+	New: func() interface{} {
+		return &Stack{data: make([]*big.Int, 0, 1024)}
+	},
+}
+
 // Stack is an object for basic stack operations. Items popped to the stack are
 // expected to be changed and modified. stack does not take care of adding newly
 // initialised objects.
@@ -29,7 +36,13 @@ type Stack struct {
 }
 
 func newstack() *Stack {
-	return &Stack{data: make([]*big.Int, 0, 1024)}
+	stack := stackPool.Get().(*Stack)
+	stack.data = stack.data[:0]
+	return stack
+}
+
+func recyclestack(stack *Stack) {
+	stackPool.Put(stack)
 }
 
 // Data returns the underlying big.Int array.