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MPC(1)MPC(1)

NAME

mpc – extended precision arithmetic code generator

SYNOPSIS

mpc [ file ... ]

DESCRIPTION

Mpc generates C functions from a simple language that operates on extended precision integers using the mp(2) library.

LANGUAGE

The language consists of a series of function definitions of the form:

name ( parameter list ) { statements }  

All variables and parameters are extended precision integers and are passed by reference. Statements are separated by semicolon and the following statemens are defined:

name = expression  

if ( condition ) { statements } else if ( condition ) { statements } else { statements }  

while ( condition ) { statements }  

break  

name ( parameter list )  

mod ( modulus ) { statements }  

There is no distinction between input and output parameters, but conventionally, the outputs are put at the end of the parameter list and the language allows one to write

F ( X, Y, Z ) as Y, Z = F ( X )  

Expressions are composed out of the following arithmetic operations:

addition.  

subtraction.  

multiplication.  

division, or multiplicative inverse when enclosed in mod block.  

division remainder.  

exponentiation.  

right shift by a constant.  

left shift by a constant.  

pick a when condition is true, otherwise b when false.  

Conditions can use the following operations:

equality.  

inequality.  

bigger than.  

smaller than.  

negation.  

SOURCE

/sys/src/cmd/mpc.y

SEE ALSO

mp(2)