From 5f7826270c9e87509fd7731ec64953a5e4761de0 Mon Sep 17 00:00:00 2001 From: Felix Lange Date: Tue, 28 Feb 2017 15:09:11 +0100 Subject: all: unify big.Int zero checks, use common/math in more places (#3716) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit * common/math: optimize PaddedBigBytes, use it more name old time/op new time/op delta PaddedBigBytes-8 71.1ns ± 5% 46.1ns ± 1% -35.15% (p=0.000 n=20+19) name old alloc/op new alloc/op delta PaddedBigBytes-8 48.0B ± 0% 32.0B ± 0% -33.33% (p=0.000 n=20+20) * all: unify big.Int zero checks Various checks were in use. This commit replaces them all with Int.Sign, which is cheaper and less code. eg templates: func before(x *big.Int) bool { return x.BitLen() == 0 } func after(x *big.Int) bool { return x.Sign() == 0 } func before(x *big.Int) bool { return x.BitLen() > 0 } func after(x *big.Int) bool { return x.Sign() != 0 } func before(x *big.Int) int { return x.Cmp(common.Big0) } func after(x *big.Int) int { return x.Sign() } * common/math, crypto/secp256k1: make ReadBits public in package math --- core/vm/gas_table.go | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'core/vm/gas_table.go') diff --git a/core/vm/gas_table.go b/core/vm/gas_table.go index fba1eb066..f1c62df8e 100644 --- a/core/vm/gas_table.go +++ b/core/vm/gas_table.go @@ -273,7 +273,7 @@ func gasExp(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem func gasCall(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { var ( gas = gt.Calls - transfersValue = stack.Back(2).BitLen() > 0 + transfersValue = stack.Back(2).Sign() != 0 address = common.BigToAddress(stack.Back(1)) eip158 = evm.ChainConfig().IsEIP158(evm.BlockNumber) ) @@ -316,7 +316,7 @@ func gasCall(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem func gasCallCode(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, mem *Memory, memorySize uint64) (uint64, error) { gas := gt.Calls - if stack.Back(2).BitLen() > 0 { + if stack.Back(2).Sign() != 0 { gas += params.CallValueTransferGas } memoryGas, err := memoryGasCost(mem, memorySize) @@ -362,7 +362,7 @@ func gasSuicide(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, if eip158 { // if empty and transfers value - if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).BitLen() > 0 { + if evm.StateDB.Empty(address) && evm.StateDB.GetBalance(contract.Address()).Sign() != 0 { gas += gt.CreateBySuicide } } else if !evm.StateDB.Exist(address) { -- cgit v1.2.3