Instruction Selection and Scheduling MCQs December 19, 2025December 14, 2024 by u930973931_answers 15 min Score: 0 Attempted: 0/15 Subscribe 1. What is the primary goal of instruction selection in a compiler? (A) To optimize the performance of the target program (B) To allocate registers efficiently (C) To detect syntax errors in the source code (D) To generate machine-specific instructions from intermediate code 2. Which of the following describes instruction scheduling in the context of compilers? (A) Selecting the appropriate data structures for the program (B) Generating intermediate code for the compiler (C) Assigning machine registers to variables (D) Ordering the instructions to optimize the performance of the target architecture 3. What does instruction scheduling aim to minimize? (A) The number of registers used (B) The number of machine instructions generated (C) The number of syntax errors in the code (D) The time required to execute the program 4. Which of the following is a technique used for instruction selection? (A) Syntax tree traversal (B) Pattern matching based on instruction templates (C) Register allocation (D) Loop unrolling 5. What does âoptimal instruction schedulingâ mean? (A) Arranging instructions so that the execution time is minimized, considering dependencies and available resources (B) Generating the fewest number of instructions (C) Generating the simplest assembly code (D) Ensuring no redundant instructions are generated 6. Which of the following is an important factor considered during instruction scheduling? (A) The number of variables used in the program (B) The number of registers available (C) Instruction dependencies, such as data and control dependencies (D) The memory size 7. Which of the following is an example of a âdata hazardâ in instruction scheduling? (A) When an instruction accesses memory before another instruction (B) When an instruction is dependent on a conditional branch (C) When two instructions use the same register (D) When an instruction depends on the result of a previous instruction 8. What is the main challenge in instruction scheduling for modern processors? (A) Considering the processorâs pipeline stages and available execution units (B) Reducing the number of instructions generated (C) Managing syntax errors (D) Allocating memory for variables 9. Which of the following is a common technique used in instruction scheduling? (A) Software pipelining (B) Loop unrolling (C) Register renaming (D) Branch prediction 10. What does âinstruction latencyâ refer to in the context of instruction scheduling? (A) The number of instructions in a basic block (B) The number of registers required by the program (C) The delay between the issue of an instruction and its execution (D) The time taken to allocate a register for a variable 11. Which of the following is true about the scheduling of dependent instructions? (A) Dependent instructions can be scheduled in any order (B) Dependent instructions must be scheduled in the order they appear in the source code (C) Dependent instructions must be scheduled in the order of their execution to avoid conflicts (D) Dependent instructions can be scheduled randomly 12. In instruction selection, what is the role of âtemplatesâ? (A) They represent the syntax of the source code (B) They define the structure of machine-specific instructions (C) They are used for loop optimization (D) They handle error detection in intermediate code 13. Which of the following is a disadvantage of poor instruction scheduling? (A) Increased execution time due to pipeline stalls or resource conflicts (B) Reduced program size (C) Reduced number of instructions (D) More efficient use of registers 14. Which of the following statements best describes âpost-RA (Register Allocation) instruction schedulingâ? (A) Scheduling instructions after the machine code has been generated (B) Scheduling instructions considering available registers (C) Scheduling instructions to avoid memory bottlenecks (D) Scheduling instructions to reduce register spilling 15. What does the term âloop unrollingâ refer to in instruction scheduling? (A) Reducing the number of instructions within a loop (B) Merging multiple loops into a single loop (C) Increasing the number of iterations in a loop for better performance (D) Breaking a loop into multiple smaller loops to improve parallelism