Why does godbolt (gcc 9.3) show parameter being passed in edi if C++ uses cdecl calling convention? I can't find anything on this
Why does godbolt show parameter being passed in edi if C++ uses cdecl calling convention?
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RBPandRSPare 64-bit registers, which means your code is being compiled for 64-bit, not 32-bit.cdeclis a 32-bit calling convention, it simply does not exist in 64-bit. On 64-bit systems, the first few integer-sized parameters are passed via registers, not the call stack.On non-Windows platforms (godbolt runs on Amazon EC2 instances using Ubuntu), the first 6 integer-sized parameters are passed via the
RDI,RSI,RDX,RCX,R8, andR9registers, respectively.EDIis bytes 0-3 ofRDI, andintis 4 bytes in your compiler, so you see thenumparameter being passed viaEDI.On Windows platforms, the first 4 integer-sized parameters are passed via the
RCX,RDX,R8, andR9registers, respectively.EDIis not used for passing parameters.See Stack frame layout on x86-64 for more details.