The specific internal implementation can vary, but the expectation is that a lambda function that captures everything by reference will store the actual stack pointer of the function it is created in, rather than individual references to stack variables.
42.
The general-purpose registers, base registers, and index registers can all be used as the base in addressing modes, and all of those registers except for the stack pointer can be used as the index in addressing modes.
43.
In 16-bit mode, this implicit stack pointer is addressed as SS : [ SP ], in 32-bit mode it is SS : [ ESP ], and in 64-bit mode it is [ RSP ].
44.
It is faster to change the top-of-stack pointer only occasionally ( once per call or return ) rather than constantly stepping it up and down throughout each program statement, and it is even faster to avoid memory references entirely.
45.
A Forth assembler is by nature a macro assembler, so that it is easy to define an alias for registers according to their role in the Forth system : e . g . " datastackpointer " for the register used as a stack pointer.
46.
IBM devised a workaround ( implemented in the stack pointer and often the interrupt mask in the real-time clock chip's RAM . This allowed the BIOS to restore the CPU to a similar state and begin executing code before the reset.
47.
Subroutines must preserve the contents of r4 to r11 and the stack pointer . ( Perhaps by saving them to the stack in the function prologue, then using them as scratch space, then restoring them from the stack in the function epilogue ).
48.
The locations of all other fields in the frame can be defined relative either to the top of the frame, as negative offsets of the stack pointer, or relative to the top of the frame below, as positive offsets of the frame pointer.
49.
Stack pointers may point to the origin of a stack or to a limited range of addresses either above or below the origin ( depending on the direction in which the stack grows ); however, the stack pointer cannot cross the origin of the stack.
50.
Stack pointers may point to the origin of a stack or to a limited range of addresses either above or below the origin ( depending on the direction in which the stack grows ); however, the stack pointer cannot cross the origin of the stack.
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