Exam 12: Floating-Point Processing and Instruction Encoding Assessment

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

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

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

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.

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

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

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

A double extended-precision real occupies 60 of storage.

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

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.

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.

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

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

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

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