search for: __addsi3

Hi all, I have a question about the types of MachineOperand. There are 12 different types of MachineOperand such as MO_Register, MO_Immediate and so on. Some of the names are self-explanatory such as MO_Register and MO_Immediate. Some of them are a little confusing such as MO_FrameIndex, MO_ConstantPoolIndex and so on. For example, what is the different between MO_ExternalSymbol and

...gt; >>> Thanks a lot in advance. Any advice will be greatly appreciated. >> GlobalAddress is used to refer to something that exists in IR, such as a global variable. ExternalSymbol is used to refer to something that isn't in the IR because it was synthesized by codegen, such as __addsi3. >> >> -Chris > > Thanks for the quick reply. According to your reply, memset and memcpy are synthesized by codegen? I saw memcpy in the source file. Did it get optimized out in the IR and later codegen synthesized memset and memcpy? Yes, codegen does synthesize memcpy in some...