Compiler Error C2443


The new home for Visual Studio documentation is Visual Studio 2017 Documentation on

The latest version of this topic can be found at Compiler Error C2443.

operand size conflict

The instruction requires operands to be the same size.

The following sample generates C2443:

// C2443.cpp  
// processor: x86  
short var;  
int main() {  
   __asm xchg ax,bl   // C2443  
   __asm mov al,red   // C2443  
   __asm mov al,BYTE PTR var   // OK