201dfdb454
`vpush {d8, d9}` came out as `vpush {r2}`. VFP list operands kept only
the 8-bit count from the encoding and stored it in a REG_LIST operand,
whose immediate the printer reads as a GPR bitmask -- so the register
bank was wrong, the start register was gone entirely, and the count was
read as a bitmask. `vldm r0, {d1, d2, d3}` printed `{r1-r2}`.
A list is now a register plus a shape: how many, and what the run steps
by. VLDM/VSTM/VPUSH/VPOP recover their start register from Vd and their
count from imm8. A GPR list stays a bitmask, since `{r4, lr}` is not a
run at all.
The NEON structure loads were wrong in a second way. VLD1-4/ST1-4 encode
their register count in the type field at bits 11:8, not in imm8, so
writing a count into the low byte overwrote size, alignment and Rm. Rm
was left at 0, which is a register post-increment, where the plain form
needs 0b1111; every one of those 23 forms encoded a writeback nobody
asked for. The count now comes from the form, the encoding writes only
Vd, and Rm is fixed in the pattern.
Deriving those counts from llvm-mc rather than by hand turned up a
dimension that was not modelled at all: the spaced forms step two
registers at a time (`vld2.8 {d2, d4}`), and VLD1 has a to-all-lanes
form written `{d2[]}`.
All 31 A32 list forms are now byte-exact against llvm-mc, from 8. The
arm32 sweep holds at 1656/1656.
Still open here: those forms only exist for .8 data, because the size
field at bits 7:6 is unencoded, and the writeback variants
(`[r0]!`, `[r0], r1`) are not modelled.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018UmHLRF11EoWwNWCJ7JGaA
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.
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Overview of Odin
An overview of the Odin programming language.
Frequently Asked Questions (FAQ)
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Examples
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Odin Documentation
Documentation for the Odin language itself.
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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.