True-False Please indicate whether each statement is True (T) or False (F). 1. T

Question

True-False Please indicate whether each statement is True (T) or False (F).

1. The first byte of every x86 machine instruction is the ModR/M byte.

2. In x86 machine instructions, the ModR/M field identifies the addressing mode and operands.

3. The FSTP instruction copies the value in ST(0) to memory, but it does not pop a value off the stack.

4. In the encoding of a MOV from a register to any other operand (89/r), the /r indicates that a Mod R/M byte follows the opcode.

5. The X86 FPU uses a standard for Binary Floating-Point Arithmetic produced by the IEEE organization

6. In a single-precision real number, the exponent uses 7 bits.

7. Not all values between 0 and 1 can be represented by a single-precision significand, but all such values can be represented by an extended-precision significand.

8. There are two types of NaNs, one of which is named Quiet NaN.

9. A double extended-precision real occupies 60 of storage.

10. In a single-precision real, the exponent field has a bias of 128.

11. The binary floating-point number 111.0001 is equivalent to decimal 7 1/8.

12. If we were to denormalize the binary number 1.1101 x 23, the result would be binary 1110.1.

13. The FCOMI instruction compares two floating-point values and sets the Zero, Parity, and Carry flags according to the result of the comparison.

14. After calling the FCOM instruction to compare two floating-point values, you must execute the FNSTSW instruction, followed by FPOP to prepare the CPU to recognize branching instructions such as JG and JL.

15. The single-precision real representation of zero contains zeros in the mantissa and ones in the exponent.

Explanation / Answer

1) True it is true because it follows the opcode and specifies operand..

2) True because the MOD REG-R/M byte specifies instruction operands and their addressing mode..the mod field specifies x86 addressing mode.

3) False The FSTP instruction copies the value in ST(0) to memory, but it does pop a value off the stack. thatz y it is false

4) True because In the encoding of a MOV from a register to any other operand (89/r), the /r indicates that a Mod R/M byte follows the opcode.

5) True

6) True

7) False

8)True

9) False

10) True

11) True

12) True

13) True

14) True

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