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.
- Overview of How the Machine Description is Used
- Everything about Instruction Patterns
- Example of define_insn
- RTL Template
- Output Templates and Operand Substitution
- C Statements for Assembler Output
- Predicates
- Operand Constraints
- Standard Pattern Names For Generation
- When the Order of Patterns Matters
- Interdependence of Patterns
- Defining Jump Instruction Patterns
- Defining Looping Instruction Patterns
- Canonicalization of Instructions
- Defining RTL Sequences for Code Generation
- Defining How to Split Instructions
- Including Patterns in Machine Descriptions.
- Machine-Specific Peephole Optimizers
- Instruction Attributes
- Conditional Execution
- RTL Templates Transformations
- Constant Definitions
- Iterators