M32R Architecture Documentation


DISCLAIMER: This documentation is derived from the cgen cpu description of this architecture, and does not represent official documentation of the chip maker.


In cgen-parlance, an architecture consists of machines and models. A `machine' is the specification of a variant of the architecture, and a `model' is the implementation of that specification. Typically there is a one-to-one correspondance between machine and model. The distinction allows for separation of what application programs see (the machine), and how to tune for the chip (what the compiler sees).
A "cpu family" is a cgen concoction to help organize the generated code. Chip variants that are quite dissimilar can be treated separately by the generated code even though they're both members of the same architecture.

M32R Architecture

This section describes various things about the cgen description of the M32R architecture. Familiarity with cgen cpu descriptions is assumed.

Bit number orientation (arch.lsb0?): msb = 0

ISA description

CPU Families

Machine variants

m32r - Generic M32R cpu

m32r2 - M32R2 cpu

m32rx - M32RX cpu

Model variants

m32r/d - m32r/d

m32r2 - m32r2

m32rx - m32rx

test - test

Registers

h-accum - accumulator

h-accums - accumulators