How do I display floating-point numbers in assembly?

How do I display floating-point numbers in assembly?

In assembly language, there are at least two standard formats for floating-point numbers: short and long. Short floating-point (32 bits): The first bit is the sign bit: 0 for positive and 1 for negative. The next 7 bits are the exponent: -64 to +63, stored as 0 to 127.

How do you encode floating-point numbers?

The basic idea of floating point encoding of a binary number is to normalize the number by shifting the bits either left or right until the shifted result lies between 1/2 and 1. (A left-shift by one place in a binary word corresponds to multiplying by 2, while a right-shift one place corresponds to dividing by 2.)

Which instruction is useful in floating-point calculation?

Transcendental Instructions (Floating-Point) The transcendental instructions perform trigonometric and logarithmic operations on floating-point operands.

What is a floating point number coding?

In programming, a floating-point or float is a variable type that is used to store floating-point number values. A floating-point number is one where the position of the decimal point can “float” rather than being in a fixed position within a number. Examples of floating-point numbers are 1.23, 87.425, and 9039454.2.

How do I print a floating point assembly?

To print a 64-bit float variable called temp in C we would write: printf( “z = %e\n”, temp ); So when we want to print z from assembly, we pass the address of the string “temp = %e\n” in the stack, followed by 2 double words representing the value of temp.

What is a floating point instruction?

A pair of special move instructions are used to move data between general and floating point registers. The floating point registers are implemented in co-processor 1. The mfc1 (move from co-processor 1) instruction is used to move the contents of a floating point register to a general register.

What is the smallest floating point number?

The smallest floating point number is 0.10000 … 00 × 2–127 | 23 bits 0.293 × 10–38 . Example. Represent 52.21875 in 32-bit binary floating point format.

What are the two types of floating-point units?

There are two floating point primitive types. Data type float is sometimes called “single-precision floating point”. Data type double has twice as many bits and is sometimes called “double-precision floating point”.

Why float is called float?

The most popular code for representing real numbers is called the IEEE Floating-Point Standard . The term floating point is derived from the fact that there is no fixed number of digits before and after the decimal point; that is, the decimal point can float.

What does floating point mean in assembly language?

Floating Point in Assembly Language. Intel’s current main floating point unit is called SSE. This includes: A brand new set of registers, xmm0 through xmm15. xmm0 is used to return values from functions, and as the first function argument. They’re *all* scratch registers; a perfectly anarchist setup.

What are the floating point instructions in x86?

Floating-Point Instructions The floating point instructions operate on floating-point, integer, and binary coded decimal (BCD) operands. Data Transfer Instructions (Floating Point) The data transfer instructions move floating-point, integer, and BCD values between memory and the floating point registers.

What are the floating point instructions in SSE2?

SSE2 Packed Single-Precision Floating-Point Instructions SSE2 128-Bit SIMD Integer Instructions SSE2 Miscellaneous Instructions Operating System Support Instructions 64-Bit AMD Opteron Considerations Index Floating-Point Instructions The floating point instructions operate on floating-point, integer, and binary coded decimal (BCD) operands.

What are the basic instructions for floating point arithmetic?

The basic arithmetic instructions perform basic arithmetic operations on floating-point and integer operands. Table 3–14 Basic Arithmetic Instructions (Floating-Point)