db2c234607
LDM and STM each held five A32 forms with identical operand shapes -- the four
increment/decrement orders plus a writeback variant -- distinguished only by
their fixed bits. Nothing could tell them apart, so the encoder always took the
first and six of the eight A32 encodings were unreachable: `ldmib`, `ldmda`,
`ldmdb`, `stmib`, `stmda`, `stmdb` could not be produced at all.
They are not variants of one mnemonic in the first place. An assembler spells
them `ldmib` / `ldmda` / `ldmdb`, with plain `ldm` meaning IA, so this follows
the same rule as the rest of the enum: one member per name an assembler
accepts. LDM/STM keep the IA order and the Thumb encodings; the other three
orders become their own mnemonics, and the T32 DB encodings join them.
All eight now encode, byte-exact against llvm-mc:
ldm e8900006 stm e8800006
ldmib e9900006 stmib e9800006
ldmda e8100006 stmda e8000006
ldmdb e9100006 stmdb e9000006
Six test checks referenced these forms by index; they were re-derived by
matching (bits, mask) against the rebuilt table rather than by adjusting
offsets, and every one was found -- so no form was lost in the move.
Writeback (`ldm r0!, {...}`) is still unreachable: it is a property of the base
operand, not a separate mnemonic, and there is nowhere to put it yet. That is
one form per family rather than four.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The Data-Oriented Language for Sane Software Development.
The Odin Programming Language
Odin is a general-purpose programming language with distinct typing, built for high performance, modern systems, and built-in data-oriented data types. The Odin Programming Language, the C alternative for the joy of programming.
Website: https://odin-lang.org/
package main
import "core:fmt"
main :: proc() {
program := "+ + * 😃 - /"
accumulator := 0
for token in program {
switch token {
case '+': accumulator += 1
case '-': accumulator -= 1
case '*': accumulator *= 2
case '/': accumulator /= 2
case '😃': accumulator *= accumulator
case: // Ignore everything else
}
}
fmt.printf("The program \"%s\" calculates the value %d\n",
program, accumulator)
}
Documentation
Getting Started
Instructions for downloading and installing the Odin compiler and libraries.
Nightly Builds
Get the latest nightly builds of Odin.
Learning Odin
Overview of Odin
An overview of the Odin programming language.
Frequently Asked Questions (FAQ)
Answers to common questions about Odin.
Packages
Documentation for all the official packages part of the core and vendor library collections.
Examples
Examples on how to write idiomatic Odin code. Shows how to accomplish specific tasks in Odin, as well as how to use packages from core and vendor.
Odin Documentation
Documentation for the Odin language itself.
Odin Discord
Get live support and talk with other Odin programmers on the Odin Discord.
Articles
The Odin Blog
The official blog of the Odin programming language, featuring announcements, news, and in-depth articles by the Odin team and guests.
Warnings
- The Odin compiler is still in development.