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POD return values 33–64 bits in size are returned via the EAX:EDX registers. Non-POD return values or values larger than 64-bits, the calling code will allocate space and passes a pointer to this space via a hidden parameter on the stack. The called function writes the return value to this address. Stack aligned on 4-byte boundary. stdcall ...
The source operand can be either an XMM register (xmm2) or a memory address (m64). When the source operand is an XMM register, the lower half of the register is used in the operation. When the source operand is a memory address, it is assumed to be the address of an 8-byte region, the value at which is used in the operation.
GCC has been ported to more platforms and instruction set architectures than any other compiler, and is widely deployed as a tool in the development of both free and proprietary software. GCC is also available for many embedded systems, including ARM-based and Power ISA-based chips.
When a function executes, it may add some of its local state data to the top of the stack; when the function exits it is responsible for removing that data from the stack. At a minimum, a thread's stack is used to store the location of a return address provided by the caller in order to allow return statements to return to the correct location.
The RETURN instruction pops the return address from the stack into the instruction pointer and execution resumes at that address. (Examples: x86 , PDP-11 ) In architectures such as the Motorola 96000 , the stack area may be allocated in a separate address space, which is called 'Stack Memory Space', [ 22 ] distinct from the main memory address ...
WASHINGTON (Reuters) -U.S. officials are communicating with people in Syria to seek information about Austin Tice, an American journalist captured there more than 12 years ago, White House ...
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