From 2a527e448d3ee75c0d40cdd90b38975db6a0d907 Mon Sep 17 00:00:00 2001
From: cmgCr <chenjiangyi.cjy@antgroup.com>
Date: Mon, 26 Jan 2026 06:04:01 +0000
Subject: [PATCH] fix(evm): fix EXTCODECOPY to handle large offset

---
 src/compiler/evm_frontend/evm_mir_compiler.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/compiler/evm_frontend/evm_mir_compiler.cpp b/src/compiler/evm_frontend/evm_mir_compiler.cpp
index f67f028f0..7b6038892 100644
--- a/src/compiler/evm_frontend/evm_mir_compiler.cpp
+++ b/src/compiler/evm_frontend/evm_mir_compiler.cpp
@@ -3338,9 +3338,13 @@ void EVMMirBuilder::handleExtCodeCopy(Operand AddressComponents,
                                       Operand OffsetComponents,
                                       Operand SizeComponents) {
   const auto &RuntimeFunctions = getRuntimeFunctionTable();
-  normalizeOperandU64(DestOffsetComponents);
-  normalizeOperandU64(OffsetComponents);
-  normalizeOperandU64(SizeComponents);
+  // Use max uint64_t value if the offset/size is not 64-bit, because the
+  // extcodecopy will fill zeros when offset is beyond code size or handle large
+  // size properly.
+  uint64_t Non64Value = std::numeric_limits<uint64_t>::max();
+  normalizeOperandU64(DestOffsetComponents, &Non64Value);
+  normalizeOperandU64(OffsetComponents, &Non64Value);
+  normalizeOperandU64(SizeComponents, &Non64Value);
 #ifdef ZEN_ENABLE_EVM_GAS_REGISTER
   syncGasToMemory();
 #endif