The value a function returns to its caller when it finishes. In pseudocode, the value of the expression written after return becomes the return value, and the function ends when return is executed.
Japanese name: 戻り値
Return value appears in 9 practice questions across 6 topics, including ISA & Assembly, Linkers, Loaders & Executables, Programming Basics (Pseudocode Tracing).
Answer: B. Arguments in a0-a7; return value in a0 (and a1)
In the standard RISC-V calling convention, up to eight integer arguments are passed in a0-a7 (x10-x17), and the return value comes back in a0, or in a0 and a1 for values such as 64-bit integers on RV32. Passing through registers, which are faster than memory, keeps call overhead low. Arguments beyond eight go on the stack. Floating-point arguments use fa0-fa7.
Answer: A. Returns 12; called 3 times
f(84, 36) calls f(36, 12) because 84 mod 36 = 12; that calls f(12, 0) because 36 mod 12 = 0; and since y is 0, it returns 12. The calls are f(84, 36), f(36, 12) and f(12, 0), three in total, and this is the Euclidean algorithm for the greatest common divisor. Because the function returns the result of its recursive call directly (tail recursion), a compiler that performs tail call optimization can turn it into a loop, so it does not keep using stack space however deep the recursion goes.
In the standard RISC-V calling convention, up to eight integer arguments are passed in a0-a7 (x10-x17), and the return value comes back in a0, or in a0 and a1 for values such as 64-bit integers on RV32.
In the standard RISC-V calling convention, which registers …The return value of the third call is 3 × 10 + 1 = 31.
When the function f above is called three times in a row, w…A calling convention specifies which registers hold arguments, where return values go, which registers the callee may clobber and how the stack is used.
What is the main purpose of defining a calling convention?Such run-time errors require checks in the program, such as testing return values.
Which program error can be detected at compile time?When main returns, its return value is passed to exit, which performs the shutdown steps.
In a C program, which statement is correct about the addres…As an Amazon Associate I earn from qualifying purchases.
Argument Stack Calling convention Recursion Variable Modulo operation Application binary interface (ABI) Entry point Linker Shell