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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.
16.1 Everything about Instruction Patterns How to write instruction patterns. 16.2 Example of define_insn
An explained example of a define_insn
pattern.16.3 RTL Template The RTL template defines what insns match a pattern. 16.4 Output Templates and Operand Substitution The output template says how to make assembler code from such an insn. 16.5 C Statements for Assembler Output For more generality, write C code to output the assembler code. 16.6 Operand Constraints When not all operands are general operands. 16.7 Standard Pattern Names For Generation Names mark patterns to use for code generation. 16.8 When the Order of Patterns Matters When the order of patterns makes a difference. 16.9 Interdependence of Patterns Having one pattern may make you need another. 16.10 Defining Jump Instruction Patterns Special considerations for patterns for jump insns. 16.11 Canonicalization of Instructions 16.12 Machine-Specific Peephole Optimizers Defining machine-specific peephole optimizations. 16.13 Defining RTL Sequences for Code Generation Generating a sequence of several RTL insns for a standard operation. 16.14 Defining How to Split Instructions Splitting Instructions into Multiple Instructions 16.15 Instruction Attributes Specifying the value of attributes for generated insns.
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