5cba6402f6
The arm64 pass turned up the same class of bug elsewhere: mnemonics named
after an encoding rather than after what an assembler accepts, and forms
that no caller can reach because the thing that tells them apart is not
checked.
mips
* The printer mapped every `_` to `.`, but MSA spells the sign qualifier
with an underscore and only the element size with a dot: `adds_s.b`,
`max_s.h`, `copy_u.w`. `adds.s.b` is rejected by an assembler. 91
mnemonics were printing text that would not reassemble. The name alone
cannot decide it -- MSA's ADDS_S_D and the FP convert CVT_S_D have the
same shape and want opposite treatment -- so the family is read off the
form's feature.
* `encode` now takes `features: Feature_Set = FEATURES_ALL` and skips
forms outside it, mirroring `decode`, which has had that parameter all
along. That asymmetry was the reason 12 mnemonics carried an ISA-variant
suffix: with no way to say which MIPS you were targeting, the pre-R6 and
R6 encodings of `mul` had to be two enum members. They are now one
mnemonic with two forms. Eight of the twelve did not even need the
feature filter -- pre-R6 MADD takes rs,rt while the PS2 MMI MADD takes
rd,rs,rt, so operand matching alone separates them. Verified against
llvm-mc: pre-R6 `mul` 712a4002, R6 `mul` 012a4098, `madd $t1,$t2`
712a0000. The printer's hand-written override table is gone.
arm32
* 20 `*_LANE` mnemonics folded into their base. The lane form differs from
the base in an operand TYPE already (DPR_ELEM vs DPR), so the matcher
could always tell them apart; the split only cost us the printed name,
which was the enum name verbatim -- `vqdmulh_lane`, which no assembler
takes. VMOV/VLD1-4/VST1-4 are left alone: their lane forms collide with
the base because register lists and lane indices are not modelled.
riscv
* ZEXT_H and REV8 each carry an RV32 and an RV64 encoding with identical
operands, and the forms were already tagged rv32_only / rv64_only -- the
encoder just never looked. `encode` now takes `xlen: XLEN = .RV64` and
filters, so the RV64 encodings are reachable at all: zext.h 0805c53b and
rev8 6b85d513, both confirmed against llvm-mc.
mos6502
* SAX_NMOS folded into SAX. The undocumented NMOS store-A&X and the
HuC6280 register swap share the mnemonic `sax`; one takes a memory
operand and the other takes none, so they are just two form sets.
Verified: every rexcode suite matches HEAD exactly, all 13 packages build,
and MIPS mnemonics llvm-mc does not recognise drop from 448 to 354.
Still open: arm32 has 201 form signatures no caller can select, because the
NEON data type (.i8/.i16/.f32) is not an operand -- `inst_vadd(d0,d1,d2)`
always yields the first form, and only a decoder-supplied form_id hint can
pick another. 38 arm32 mnemonics still carry encoding-shaped names
(VPADD_F, VCEQ_Z, VLDRB_GATHER, VMOV_Q_R, ...).
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.