GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
Imager::Expr::Assem(3) User Contributed Perl Documentation Imager::Expr::Assem(3)

  Imager::Expr::Assem - an assembler for producing code for the Imager
  register machine

  use Imager::Expr::Assem;
  my $expr = Imager::Expr->new(assem=>'...', ...)

This module is a simple Imager::Expr compiler that compiles a low-level language that has a nearly 1-to-1 relationship to the internal representation used for compiled register machine code.

Each line can contain multiple statements separated by semi-colons.

Anything after '#' in a line is ignored.

Types of statements:

variable definition
"var" name:type

defines variable name to have type, which can be any of "n" or "num" for a numeric type or "pixel", "p" or "c" for a pixel or color type.

Variable names cannot include white-space.

operators
Operators can be split into 3 basic types, those that have a result value, those that don't and the null operator, eg. jump has no value.

The format for operators that return a value is typically:

result = operator operand ...

and for those that don't return a value:

operator operand

where operator is any valid register machine operator, result is any variable defined with "var", and operands are variables, constants or literals, or for jump operators, labels.

The set operator can be simplified to:

result = operator

All operators maybe preceded by a label, which is any non-white-space text immediately followed by a colon (':').

Note that the current optimizer may produce incorrect optimization for your code, fortunately the optimizer will disable itself if you include any jump operator in your code. A single jump to anywhere after your final "ret" operator can be used to disable the optimizer without slowing down your code.

There's currently no high-level code generation that can generate code with loops or real conditions.

Imager(3), transform.perl, regmach.c

Tony Cook <tony@develop-help.com>
2020-06-13 perl v5.32.1

Search for    or go to Top of page |  Section 3 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.