index.md

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title: WebAssembly numeric instructions
slug: WebAssembly/Reference/Numeric

---

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WebAssembly numeric instructions.

Constants

• Const

  • : Declare a constant numbers.

Comparison

• Equal

  • : Check if two numbers are equal.

• Not equal

  • : Check if two numbers are not equal.

• Greater than

  • : Check if a number is greater than another number.

• Less than

  • : Check if a number is less than another number.

• Greater or equal

  • : Check if a number is greater than or equal to another number.

• Less or equal

  • : Check if a number is less than or equal to another number.

Arithmetic

• Addition

  • : Add up two numbers.

• Subtraction

  • : Subtract one number from another number.

• Multiplication

  • : Multiply one number by another number.

• Division

  • : Divide one number by another number.

• Remainder

  • : Calculate the remainder left over when one integer is divided by another integer.

Conversion

• Extend

  • : Convert (extend) i32 to i64.

• Wrap

  • : Convert (wrap) i64 to i32.

• Promote

  • : Convert (promote) f32 to f64.

• Demote

  • : Convert (demote) f64 to f32.

• Convert

  • : Convert integers to floating points.

• Truncate (float to int)

  • : Convert (truncate fractional part) floating points to integers.

• Reinterpret

  • : Reinterpret the bytes of integers as floating points and vice versa.

Floating point specific instructions

• Min

  • : Get the lower of two numbers.

• Max

  • : Get the higher of two numbers.

• Nearest

  • : Round a number to the nearest integer.

• Ceil

  • : Round up a number.

• Floor

  • : Round down a number.

• Truncate (float to float)

  • : Discard the fractional part of a number.

• Absolute

  • : Get the absolute value of a number.

• Negate

  • : Negate a number.

• Square root

  • : Get the square root of a number.

• Copy sign

  • : Copy just the sign bit from one number to another.

Bitwise

• AND

  • : Used for performing a bitwise AND.

• OR

  • : Used for performing a bitwise OR.

• XOR

  • : Used for performing a bitwise XOR.

• Left shift

  • : Used for performing a bitwise left-shift.

• Right shift

  • : Used for performing a bitwise left-shift.

• Left rotate

  • : Used for performing a bitwise left-rotate.

• Right rotate

  • : Used for performing a bitwise right-rotate.

• Count leading zeros

  • : Count the amount of leading zeros in a numbers binary representation.

• Count trailing zeros

  • : Count the amount of trailing zeros in a numbers binary representation.

• Population count

  • : Count the total amount of 1s in a numbers binary representation.