(gcc.info) Machine Desc

 
 Machine Descriptions
 ********************
 
    A machine description has two parts: a file of instruction patterns
 (`.md' file) and a C header file of macro definitions.
 
    The `.md' file for a target machine contains a pattern for each
 instruction that the target machine supports (or at least each
 instruction that is worth telling the compiler about).  It may also
 contain comments.  A semicolon causes the rest of the line to be a
 comment, unless the semicolon is inside a quoted string.
 
    See the next chapter for information on the C header file.

 
* Patterns            How to write instruction patterns.
* Example             An explained example of a `define_insn' pattern.
* RTL Template        The RTL template defines what insns match a pattern.
* Output Template     The output template says how to make assembler code
                           from such an insn.
* Output Statement    For more generality, write C code to output
                           the assembler code.
* Constraints         When not all operands are general operands.
* Standard Names      Names mark patterns to use for code generation.
* Pattern Ordering    When the order of patterns makes a difference.
* Dependent Patterns  Having one pattern may make you need another.
* Jump Patterns       Special considerations for patterns for jump insns.
* Insn CanonicalizationsCanonicalization of Instructions
* Peephole DefinitionsDefining machine-specific peephole optimizations.
* Expander DefinitionsGenerating a sequence of several RTL insns
                          for a standard operation.
* Insn Splitting    Splitting Instructions into Multiple Instructions
* Insn Attributes     Specifying the value of attributes for generated insns.

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