EIP7939: Count leading zeros (CLZ) opcode

core/vm/eips.go

@@ -39,6 +39,7 @@ var activators = map[int]func(*JumpTable){
 	1344: enable1344,
 	1153: enable1153,
 	7702: enable7702,
+	7939: enable7939,
 }
 
 // EnableEIP enables the given EIP on the config.
@@ -280,3 +281,20 @@ func enable7702(jt *JumpTable) {
 	jt[STATICCALL].dynamicGas = gasStaticCallEIP7702
 	jt[DELEGATECALL].dynamicGas = gasDelegateCallEIP7702
 }
+
+// opCLZ implements the CLZ opcode (count leading zero bits)
+func opCLZ(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]byte, error) {
+	x := scope.Stack.peek()
+	x.SetUint64(256 - uint64(x.BitLen()))
+	return nil, nil
+}
+
+// enable7939 enables EIP-7939 (CLZ opcode)
+func enable7939(jt *JumpTable) {
+	jt[CLZ] = &operation{
+		execute:     opCLZ,
+		constantGas: GasFastStep,
+		minStack:    minStack(1, 1),
+		maxStack:    maxStack(1, 1),
+	}
+}

core/vm/instructions_test.go

@@ -848,3 +848,43 @@ func TestOpMCopy(t *testing.T) {
 		}
 	}
 }
+
+func TestOpCLZ(t *testing.T) {
+	evm := NewEVM(BlockContext{}, TxContext{}, nil, params.TestChainConfig, Config{})
+
+	tests := []struct {
+		inputHex string
+		want     uint64 // expected CLZ result
+	}{
+		{"0x0", 256},
+		{"0x1", 255},
+		{"0x6ff", 245},        // 0x6ff = 0b11011111111 (11 bits), so 256-11 = 245
+		{"0xffffffffff", 216}, // 40 bits, so 256-40 = 216
+		{"0x4000000000000000000000000000000000000000000000000000000000000000", 1},
+		{"0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 1},
+		{"0x8000000000000000000000000000000000000000000000000000000000000000", 0},
+		{"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0},
+	}
+	for _, tc := range tests {
+		// prepare a fresh stack and PC
+		stack := newstack()
+		pc := uint64(0)
+
+		// parse input
+		val := new(uint256.Int)
+		if err := val.SetFromHex(tc.inputHex); err != nil {
+			t.Fatal("invalid hex uint256:", tc.inputHex)
+		}
+
+		stack.push(val)
+		opCLZ(&pc, evm.interpreter, &ScopeContext{Stack: stack})
+
+		if gotLen := stack.len(); gotLen != 1 {
+			t.Fatalf("stack length = %d; want 1", gotLen)
+		}
+		result := stack.pop()
+		if got := result.Uint64(); got != tc.want {
+			t.Fatalf("clz(%q) = %d; want %d", tc.inputHex, got, tc.want)
+		}
+	}
+}

core/vm/interpreter.go

@@ -74,6 +74,8 @@ func NewEVMInterpreter(evm *EVM, cfg Config) *EVMInterpreter {
 	if cfg.JumpTable[STOP] == nil {
 		var jt JumpTable
 		switch {
+		case evm.chainRules.IsGalileo:
+			jt = galileoInstructionSet
 		case evm.chainRules.IsFeynman:
 			jt = feynmanInstructionSet
 		case evm.chainRules.IsEuclidV2:

core/vm/jump_table.go

@@ -63,11 +63,21 @@ var (
 	darwinInstructionSet           = newDarwinInstructionSet()
 	euclidV2InstructionSet         = newEuclidV2InstructionSet()
 	feynmanInstructionSet          = newFeynmanInstructionSet()
+	galileoInstructionSet          = newGalileoInstructionSet()
 )
 
 // JumpTable contains the EVM opcodes supported at a given fork.
 type JumpTable [256]*operation
 
+// newGalileoInstructionSet returns the frontier, homestead, byzantium,
+// contantinople, istanbul, petersburg, berlin, london, shanghai, curie, darwin, euclidV2,
+// feynman and galileo instructions.
+func newGalileoInstructionSet() JumpTable {
+	instructionSet := newFeynmanInstructionSet()
+	enable7939(&instructionSet) // EIP-7939 (CLZ opcode)
+	return instructionSet
+}
+
 // newFeynmanInstructionSet returns the frontier, homestead, byzantium,
 // contantinople, istanbul, petersburg, berlin, london, shanghai, curie, darwin, euclidV2,
 // and feynman instructions.

core/vm/opcodes.go

@@ -69,6 +69,7 @@ const (
 	SHL    OpCode = 0x1b
 	SHR    OpCode = 0x1c
 	SAR    OpCode = 0x1d
+	CLZ    OpCode = 0x1e
 
 	SHA3 OpCode = 0x20
 )
@@ -255,6 +256,7 @@ var opCodeToString = map[OpCode]string{
 	SHL:    "SHL",
 	SHR:    "SHR",
 	SAR:    "SAR",
+	CLZ:    "CLZ",
 	ADDMOD: "ADDMOD",
 	MULMOD: "MULMOD",
 
@@ -430,6 +432,7 @@ var stringToOp = map[string]OpCode{
 	"SHL":            SHL,
 	"SHR":            SHR,
 	"SAR":            SAR,
+	"CLZ":            CLZ,
 	"ADDMOD":         ADDMOD,
 	"MULMOD":         MULMOD,
 	"SHA3":           SHA3,

params/config.go

@@ -670,6 +670,7 @@ type ChainConfig struct {
 	EuclidTime          *uint64  `json:"euclidTime,omitempty"`          // Euclid switch time (nil = no fork, 0 = already on euclid)
 	EuclidV2Time        *uint64  `json:"euclidv2Time,omitempty"`        // EuclidV2 switch time (nil = no fork, 0 = already on euclidv2)
 	FeynmanTime         *uint64  `json:"feynmanTime,omitempty"`         // Feynman switch time (nil = no fork, 0 = already on feynman)
+	GalileoTime         *uint64  `json:"galileoTime,omitempty"`         // Galileo switch time (nil = no fork, 0 = already on galileo)
 
 	// TerminalTotalDifficulty is the amount of total difficulty reached by
 	// the network that triggers the consensus upgrade.
@@ -1014,6 +1015,10 @@ func (c *ChainConfig) IsFeynman(now uint64) bool {
 	return isForkedTime(now, c.FeynmanTime)
 }
 
+func (c *ChainConfig) IsGalileo(now uint64) bool {
+	return isForkedTime(now, c.GalileoTime)
+}
+
 // IsFeynmanTransitionBlock returns whether the given block timestamp corresponds to the first Feynman block.
 func (c *ChainConfig) IsFeynmanTransitionBlock(blockTimestamp uint64, parentTimestamp uint64) bool {
 	return isForkedTime(blockTimestamp, c.FeynmanTime) && !isForkedTime(parentTimestamp, c.FeynmanTime)
@@ -1247,7 +1252,7 @@ type Rules struct {
 	IsByzantium, IsConstantinople, IsPetersburg, IsIstanbul bool
 	IsBerlin, IsLondon, IsArchimedes, IsShanghai            bool
 	IsBernoulli, IsCurie, IsDarwin, IsEuclid, IsEuclidV2    bool
-	IsFeynman                                               bool
+	IsFeynman, IsGalileo                                    bool
 }
 
 // Rules ensures c's ChainID is not nil.
@@ -1276,5 +1281,6 @@ func (c *ChainConfig) Rules(num *big.Int, time uint64) Rules {
 		IsEuclid:         c.IsEuclid(time),
 		IsEuclidV2:       c.IsEuclidV2(time),
 		IsFeynman:        c.IsFeynman(time),
+		IsGalileo:        c.IsGalileo(time),
 	}
 }

rollup/missing_header_fields/export-headers-toolkit/go.mod

@@ -5,7 +5,7 @@ go 1.22
 replace github.com/scroll-tech/go-ethereum => ../../..
 
 require (
-	github.com/scroll-tech/da-codec v0.1.3-0.20250626091118-58b899494da6
+	github.com/scroll-tech/da-codec v0.1.3-0.20250825071838-cddc263e5ef6
 	github.com/scroll-tech/go-ethereum v1.10.14-0.20250625112225-a67863c65587
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0

rollup/missing_header_fields/export-headers-toolkit/go.sum

@@ -173,6 +173,7 @@ github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQD
 github.com/scroll-tech/da-codec v0.1.3-0.20250313120912-344f2d5e33e1 h1:Dhd58LE1D+dnoxpgLVeQBMF9uweL/fhQfZHWtWSiOlE=
 github.com/scroll-tech/da-codec v0.1.3-0.20250313120912-344f2d5e33e1/go.mod h1:yhTS9OVC0xQGhg7DN5iV5KZJvnSIlFWAxDdp+6jxQtY=
 github.com/scroll-tech/da-codec v0.1.3-0.20250626091118-58b899494da6/go.mod h1:Z6kN5u2khPhiqHyk172kGB7o38bH/nj7Ilrb/46wZGg=
+github.com/scroll-tech/da-codec v0.1.3-0.20250825071838-cddc263e5ef6/go.mod h1:Z6kN5u2khPhiqHyk172kGB7o38bH/nj7Ilrb/46wZGg=
 github.com/scroll-tech/zktrie v0.8.4 h1:UagmnZ4Z3ITCk+aUq9NQZJNAwnWl4gSxsLb2Nl7IgRE=
 github.com/scroll-tech/zktrie v0.8.4/go.mod h1:XvNo7vAk8yxNyTjBDj5WIiFzYW4bx/gJ78+NK6Zn6Uk=
 github.com/shirou/gopsutil v3.21.11+incompatible h1:+1+c1VGhc88SSonWP6foOcLhvnKlUeu/erjjvaPEYiI=