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Brendan Punsky ba5d1dab00 rexcode/arm64: 89 system registers had the wrong encoding
Printing MRS/MSR operands by name made these visible: sweeping all 230
constants through encode -> decode -> print -> llvm-mc, 89 of them
assembled to bytes we did not produce. TCR_EL1 encoded as 0x4282 where
the architecture says 0x4102, FAR_EL1 as 0x5300 for 0x4300, the whole
pointer-auth key block was off by a CRn, and so on. Anything reading
one of them got a different register than it asked for.

The field comments were right and only the packed values were wrong,
so most of the file could be rebuilt from its own comments and checked
against llvm-mc. Thirteen needed more: nine had bad comments too
(RGSR/GCR/TFSR/TFSRE0, ID_MMFR4/5, and the three ICC SGI registers --
ICC_SGI*_EL1 are op1=0, not 3), and four carried a "historic collision"
note instead of fields. Those were derived from the ARM ARM and agree
with llvm-mc.

Five of the six encodings that looked like duplicates were simply wrong
values landing on each other; one real pair is left, DBGDTRRX_EL0 and
DBGDTRTX_EL0, which genuinely share an encoding as the read and write
views of one register. The name table prefers the read name, since MRS
is the direction that has to print.

All 230 now verified byte-exact against llvm-mc: 222 through MRS, and
the 8 write-only ones through MSR.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018UmHLRF11EoWwNWCJ7JGaA
2026-08-27 09:43:17 -04:00
2025-12-11 11:11:53 +00:00
2025-10-28 13:26:56 +00:00
2018-12-27 10:51:15 +00:00
2026-08-27 12:01:10 +01:00
2026-08-09 20:23:34 +02:00
2022-11-04 11:40:07 +00:00
2026-08-12 16:17:49 +01:00
2025-09-26 12:05:16 +02:00
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Odin logo
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.
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