(gcc.info) RTL

 
 RTL Representation
 ******************
 
    Most of the work of the compiler is done on an intermediate
 representation called register transfer language.  In this language,
 the instructions to be output are described, pretty much one by one, in
 an algebraic form that describes what the instruction does.
 
    RTL is inspired by Lisp lists.  It has both an internal form, made
 up of structures that point at other structures, and a textual form
 that is used in the machine description and in printed debugging dumps.
 The textual form uses nested parentheses to indicate the pointers in
 the internal form.

 
* RTL Objects       Expressions vs vectors vs strings vs integers.
* RTL Classes       Categories of RTL expresion objects, and their structure.
* Accessors         Macros to access expression operands or vector elts.
* Flags             Other flags in an RTL expression.
* Machine Modes     Describing the size and format of a datum.
* Constants         Expressions with constant values.
* Regs and Memory   Expressions representing register contents or memory.
* Arithmetic        Expressions representing arithmetic on other expressions.
* Comparisons       Expressions representing comparison of expressions.
* Bit Fields        Expressions representing bitfields in memory or reg.
* Conversions       Extending, truncating, floating or fixing.
* RTL Declarations  Declaring volatility, constancy, etc.
* Side Effects      Expressions for storing in registers, etc.
* Incdec            Embedded side-effects for autoincrement addressing.
* Assembler         Representing `asm' with operands.
* Insns             Expression types for entire insns.
* Calls             RTL representation of function call insns.
* Sharing           Some expressions are unique; others *must* be copied.
* Reading RTL       Reading textual RTL from a file.

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