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Signed-off-by: Quentin Monnet <qmo@qmon.net>
Bug fixes: - Fix integer overflow in local function calls by using checked arithmetic for call offsets. Previously, certain call offset values could cause an integer overflow/underflow. - Fix 32-bit ALU operations (ADD32, SUB32, MUL32) to properly zero-extend results. The result is now correctly cast to u32 before extending to u64. - Replace unimplemented!() panics with proper error messages for unsupported instructions (XADD, TAIL_CALL), preventing unexpected panics during execution. - In the x86_64 JIT compiler, fix divisor handling in emit_muldivmod: the JIT now correctly uses the is_reg flag to determine whether the divisor is in a register or an immediate value, rather than checking if imm != 0. (These notes were mostly generated from the Git history by Claude Code.) Signed-off-by: Quentin Monnet <qmo@qmon.net>
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