core/vm: improved push instructions

Improved push instructions by removing unnecessary big int allocations
and by making it int instead of big.Int

1 files changed, 16 insertions, 3 deletions

diff --git a/core/vm/instructions.go b/core/vm/instructions.go
index fa4dbe428..c0ac911ac 100644
--- a/core/vm/instructions.go
+++ b/core/vm/instructions.go
@@ -706,10 +706,23 @@ func makeLog(size int) executionFunc {
 }
 
 // make push instruction function
-func makePush(size uint64, bsize *big.Int) executionFunc {
+func makePush(size uint64, pushByteSize int) executionFunc {
 	return func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
-		byts := getData(contract.Code, evm.interpreter.intPool.get().SetUint64(*pc+1), bsize)
-		stack.push(new(big.Int).SetBytes(byts))
+		codeLen := len(contract.Code)
+
+		startMin := codeLen
+		if int(*pc+1) < startMin {
+			startMin = int(*pc + 1)
+		}
+
+		endMin := codeLen
+		if startMin+pushByteSize < endMin {
+			endMin = startMin + pushByteSize
+		}
+
+		integer := evm.interpreter.intPool.get()
+		stack.push(integer.SetBytes(common.RightPadBytes(contract.Code[startMin:endMin], pushByteSize)))
+
 		*pc += size
 		return nil, nil
 	}