[Computer Architechture] call

Language Execution continuum

An interpreter is a program that executes other programs.

1. langurage translation gives us another option
2. In genreral, we interpret a high-level language to a lower-level language to increase preformance

interpretation

1. Python
2. asm

Assembler directives

pseudo-instruction replacement

what's tail's about

{...
 lots of code
 return foo(y);
}

• it's recursive call to foo() if this is within foo(), or call to a different function...
• for effictiency
  • Evaluate the arguments for foo() in a0-a7
  • return ra, all callee saved registers and sp
  • Then call foo() with j or tail
• when foo() returns, it can return directly to where it needs to return to
  • Rather than returning to wherever foo() was called and returning from there
  • Tail call optimization

branches

Linking progress

Four types of Address

PC- relative addredding (beq)

Absolute addresses in RISC-V

Loading process