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Questions and Answers
What is in-line assembly code?
What is in-line assembly code?
- A way to put assembly instructions in-line between your C statements. (correct)
- A way to integrate assembly code with C by writing C callable functions.
- A way to execute faster than a function call to the equivalent amount of assembly code
- A lot trickier way to integrate assembly code with C than writing C callable functions.
What do you need to know to integrate assembly code with C using in-line assembly code?
What do you need to know to integrate assembly code with C using in-line assembly code?
- How to execute faster than a function call to the equivalent amount of assembly code
- How to write C callable functions.
- How the compiler locates variables, uses registers, and manages the stack. (correct)
- How to write assembly code
Which of the following is an example of a function with in-line assembly code?
Which of the following is an example of a function with in-line assembly code?
- int foobar(int x, int *y) { return x + *y; }
- int foobar(int x, int *y) { return x - *y; }
- int foobar(int x, int *y) { return x * *y; }
- int foobar(int x, int *y) { asm("pushl %eax"); i = x; j = &i; *y = *j; asm("popl %eax"); return 0; } (correct)
What is the state of the stack at maximum depth in the assembled code?
What is the state of the stack at maximum depth in the assembled code?
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Which of the following is an optional field in the i386 byte by byte binary instruction format?
Which of the following is an optional field in the i386 byte by byte binary instruction format?
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What is the advantage of generating optimal code for performance?
What is the advantage of generating optimal code for performance?
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Which of the following is a shorter machine code available for some instructions involving %eax?
Which of the following is a shorter machine code available for some instructions involving %eax?
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Study Notes
- GCC compiler allows for in-line assembly instructions in C code
- In-line assembly is trickier to integrate than writing C callable functions
- Requires knowledge of how the compiler locates variables, uses registers, and manages the stack
- In-line assembly code executes faster than a function call to equivalent assembly code
- Sample function with in-line assembly code provided
- Resulting .s file shows state of the stack and body of function logic
- Machine language coding rules involve various required and optional binary fields
- i386 byte by byte binary instruction format includes instruction prefixes, op code, SIB, displacement, and data elements
- ModR/M 3-bit register codes provided
- Understanding machine language is important for generating optimal code for performance.
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