path: root/core/vm/instructions_test.go

// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package vm

import (
    "math/big"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/params"
)

type twoOperandTest struct {
    x        string
    y        string
    expected string
}

func testTwoOperandOp(t *testing.T, tests []twoOperandTest, opFn func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error)) {
    var (
        env   = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
        stack = newstack()
        pc    = uint64(0)
    )
    env.interpreter.intPool = poolOfIntPools.get()
    for i, test := range tests {
        x := new(big.Int).SetBytes(common.Hex2Bytes(test.x))
        shift := new(big.Int).SetBytes(common.Hex2Bytes(test.y))
        expected := new(big.Int).SetBytes(common.Hex2Bytes(test.expected))
        stack.push(x)
        stack.push(shift)
        opFn(&pc, env, nil, nil, stack)
        actual := stack.pop()
        if actual.Cmp(expected) != 0 {
            t.Errorf("Testcase %d, expected  %v, got %v", i, expected, actual)
        }
        // Check pool usage
        // 1.pool is not allowed to contain anything on the stack
        // 2.pool is not allowed to contain the same pointers twice
        if env.interpreter.intPool.pool.len() > 0 {

            poolvals := make(map[*big.Int]struct{})
            poolvals[actual] = struct{}{}

            for env.interpreter.intPool.pool.len() > 0 {
                key := env.interpreter.intPool.get()
                if _, exist := poolvals[key]; exist {
                    t.Errorf("Testcase %d, pool contains double-entry", i)
                }
                poolvals[key] = struct{}{}
            }
        }
    }
    poolOfIntPools.put(env.interpreter.intPool)
}

func TestByteOp(t *testing.T) {
    var (
        env   = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
        stack = newstack()
    )
    env.interpreter.intPool = poolOfIntPools.get()
    tests := []struct {
        v        string
        th       uint64
        expected *big.Int
    }{
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 0, big.NewInt(0xAB)},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 1, big.NewInt(0xCD)},
        {"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 0, big.NewInt(0x00)},
        {"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 1, big.NewInt(0xCD)},
        {"0000000000000000000000000000000000000000000000000000000000102030", 31, big.NewInt(0x30)},
        {"0000000000000000000000000000000000000000000000000000000000102030", 30, big.NewInt(0x20)},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 32, big.NewInt(0x0)},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0xFFFFFFFFFFFFFFFF, big.NewInt(0x0)},
    }
    pc := uint64(0)
    for _, test := range tests {
        val := new(big.Int).SetBytes(common.Hex2Bytes(test.v))
        th := new(big.Int).SetUint64(test.th)
        stack.push(val)
        stack.push(th)
        opByte(&pc, env, nil, nil, stack)
        actual := stack.pop()
        if actual.Cmp(test.expected) != 0 {
            t.Fatalf("Expected  [%v] %v:th byte to be %v, was %v.", test.v, test.th, test.expected, actual)
        }
    }
    poolOfIntPools.put(env.interpreter.intPool)
}

func TestSHL(t *testing.T) {
    // Testcases from https://github.com/ethereum/EIPs/blob/master/EIPS/eip-145.md#shl-shift-left
    tests := []twoOperandTest{
        {"0000000000000000000000000000000000000000000000000000000000000001", "00", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "01", "0000000000000000000000000000000000000000000000000000000000000002"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "ff", "8000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "0100", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "0101", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "00", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "01", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ff", "8000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0100", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000000", "01", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "01", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffe"},
    }
    testTwoOperandOp(t, tests, opSHL)
}

func TestSHR(t *testing.T) {
    // Testcases from https://github.com/ethereum/EIPs/blob/master/EIPS/eip-145.md#shr-logical-shift-right
    tests := []twoOperandTest{
        {"0000000000000000000000000000000000000000000000000000000000000001", "00", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "01", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "01", "4000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "ff", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "0100", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "0101", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "00", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "01", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ff", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0100", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000000", "01", "0000000000000000000000000000000000000000000000000000000000000000"},
    }
    testTwoOperandOp(t, tests, opSHR)
}

func TestSAR(t *testing.T) {
    // Testcases from https://github.com/ethereum/EIPs/blob/master/EIPS/eip-145.md#sar-arithmetic-shift-right
    tests := []twoOperandTest{
        {"0000000000000000000000000000000000000000000000000000000000000001", "00", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "01", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "01", "c000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "ff", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "0100", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"8000000000000000000000000000000000000000000000000000000000000000", "0101", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "00", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "01", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ff", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0100", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"},
        {"0000000000000000000000000000000000000000000000000000000000000000", "01", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"4000000000000000000000000000000000000000000000000000000000000000", "fe", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "f8", "000000000000000000000000000000000000000000000000000000000000007f"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "fe", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0100", "0000000000000000000000000000000000000000000000000000000000000000"},
    }

    testTwoOperandOp(t, tests, opSAR)
}

func TestSGT(t *testing.T) {
    tests := []twoOperandTest{

        {"0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000001", "8000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000001", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "8000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb", "0000000000000000000000000000000000000000000000000000000000000000"},
    }
    testTwoOperandOp(t, tests, opSgt)
}

func TestSLT(t *testing.T) {
    tests := []twoOperandTest{
        {"0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"0000000000000000000000000000000000000000000000000000000000000001", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"8000000000000000000000000000000000000000000000000000000000000001", "8000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"8000000000000000000000000000000000000000000000000000000000000001", "7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "8000000000000000000000000000000000000000000000000000000000000001", "0000000000000000000000000000000000000000000000000000000000000001"},
        {"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd", "0000000000000000000000000000000000000000000000000000000000000000"},
        {"fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffd", "fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffb", "0000000000000000000000000000000000000000000000000000000000000001"},
    }
    testTwoOperandOp(t, tests, opSlt)
}

func opBenchmark(bench *testing.B, op func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error), args ...string) {
    var (
        env   = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
        stack = newstack()
    )
    // convert args
    byteArgs := make([][]byte, len(args))
    for i, arg := range args {
        byteArgs[i] = common.Hex2Bytes(arg)
    }
    pc := uint64(0)
    bench.ResetTimer()
    for i := 0; i < bench.N; i++ {
        for _, arg := range byteArgs {
            a := new(big.Int).SetBytes(arg)
            stack.push(a)
        }
        op(&pc, env, nil, nil, stack)
        stack.pop()
    }
}

func BenchmarkOpAdd64(b *testing.B) {
    x := "ffffffff"
    y := "fd37f3e2bba2c4f"

    opBenchmark(b, opAdd, x, y)
}

func BenchmarkOpAdd128(b *testing.B) {
    x := "ffffffffffffffff"
    y := "f5470b43c6549b016288e9a65629687"

    opBenchmark(b, opAdd, x, y)
}

func BenchmarkOpAdd256(b *testing.B) {
    x := "0802431afcbce1fc194c9eaa417b2fb67dc75a95db0bc7ec6b1c8af11df6a1da9"
    y := "a1f5aac137876480252e5dcac62c354ec0d42b76b0642b6181ed099849ea1d57"

    opBenchmark(b, opAdd, x, y)
}

func BenchmarkOpSub64(b *testing.B) {
    x := "51022b6317003a9d"
    y := "a20456c62e00753a"

    opBenchmark(b, opSub, x, y)
}

func BenchmarkOpSub128(b *testing.B) {
    x := "4dde30faaacdc14d00327aac314e915d"
    y := "9bbc61f5559b829a0064f558629d22ba"

    opBenchmark(b, opSub, x, y)
}

func BenchmarkOpSub256(b *testing.B) {
    x := "4bfcd8bb2ac462735b48a17580690283980aa2d679f091c64364594df113ea37"
    y := "97f9b1765588c4e6b69142eb00d20507301545acf3e1238c86c8b29be227d46e"

    opBenchmark(b, opSub, x, y)
}

func BenchmarkOpMul(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opMul, x, y)
}

func BenchmarkOpDiv256(b *testing.B) {
    x := "ff3f9014f20db29ae04af2c2d265de17"
    y := "fe7fb0d1f59dfe9492ffbf73683fd1e870eec79504c60144cc7f5fc2bad1e611"
    opBenchmark(b, opDiv, x, y)
}

func BenchmarkOpDiv128(b *testing.B) {
    x := "fdedc7f10142ff97"
    y := "fbdfda0e2ce356173d1993d5f70a2b11"
    opBenchmark(b, opDiv, x, y)
}

func BenchmarkOpDiv64(b *testing.B) {
    x := "fcb34eb3"
    y := "f97180878e839129"
    opBenchmark(b, opDiv, x, y)
}

func BenchmarkOpSdiv(b *testing.B) {
    x := "ff3f9014f20db29ae04af2c2d265de17"
    y := "fe7fb0d1f59dfe9492ffbf73683fd1e870eec79504c60144cc7f5fc2bad1e611"

    opBenchmark(b, opSdiv, x, y)
}

func BenchmarkOpMod(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opMod, x, y)
}

func BenchmarkOpSmod(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opSmod, x, y)
}

func BenchmarkOpExp(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opExp, x, y)
}

func BenchmarkOpSignExtend(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opSignExtend, x, y)
}

func BenchmarkOpLt(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opLt, x, y)
}

func BenchmarkOpGt(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opGt, x, y)
}

func BenchmarkOpSlt(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opSlt, x, y)
}

func BenchmarkOpSgt(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opSgt, x, y)
}

func BenchmarkOpEq(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opEq, x, y)
}
func BenchmarkOpEq2(b *testing.B) {
    x := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201ffffffff"
    y := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201fffffffe"
    opBenchmark(b, opEq, x, y)
}
func BenchmarkOpAnd(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opAnd, x, y)
}

func BenchmarkOpOr(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opOr, x, y)
}

func BenchmarkOpXor(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opXor, x, y)
}

func BenchmarkOpByte(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opByte, x, y)
}

func BenchmarkOpAddmod(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    z := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opAddmod, x, y, z)
}

func BenchmarkOpMulmod(b *testing.B) {
    x := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    y := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"
    z := "ABCDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff"

    opBenchmark(b, opMulmod, x, y, z)
}

func BenchmarkOpSHL(b *testing.B) {
    x := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201ffffffff"
    y := "ff"

    opBenchmark(b, opSHL, x, y)
}
func BenchmarkOpSHR(b *testing.B) {
    x := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201ffffffff"
    y := "ff"

    opBenchmark(b, opSHR, x, y)
}
func BenchmarkOpSAR(b *testing.B) {
    x := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201ffffffff"
    y := "ff"

    opBenchmark(b, opSAR, x, y)
}
func BenchmarkOpIsZero(b *testing.B) {
    x := "FBCDEF090807060504030201ffffffffFBCDEF090807060504030201ffffffff"
    opBenchmark(b, opIszero, x)
}

func TestOpMstore(t *testing.T) {
    var (
        env   = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
        stack = newstack()
        mem   = NewMemory()
    )
    env.interpreter.intPool = poolOfIntPools.get()
    mem.Resize(64)
    pc := uint64(0)
    v := "abcdef00000000000000abba000000000deaf000000c0de00100000000133700"
    stack.pushN(new(big.Int).SetBytes(common.Hex2Bytes(v)), big.NewInt(0))
    opMstore(&pc, env, nil, mem, stack)
    if got := common.Bytes2Hex(mem.Get(0, 32)); got != v {
        t.Fatalf("Mstore fail, got %v, expected %v", got, v)
    }
    stack.pushN(big.NewInt(0x1), big.NewInt(0))
    opMstore(&pc, env, nil, mem, stack)
    if common.Bytes2Hex(mem.Get(0, 32)) != "0000000000000000000000000000000000000000000000000000000000000001" {
        t.Fatalf("Mstore failed to overwrite previous value")
    }
    poolOfIntPools.put(env.interpreter.intPool)
}

func BenchmarkOpMstore(bench *testing.B) {
    var (
        env   = NewEVM(Context{}, nil, params.TestChainConfig, Config{})
        stack = newstack()
        mem   = NewMemory()
    )
    mem.Resize(64)
    pc := uint64(0)
    memStart := big.NewInt(0)
    value := big.NewInt(0x1337)

    bench.ResetTimer()
    for i := 0; i < bench.N; i++ {
        stack.pushN(value, memStart)
        opMstore(&pc, env, nil, mem, stack)
    }
}