dev-2026-09

New Language Features

• Experimental: Inline asm templates for x86/x64, ARM and RISC-V in #7271, #7406 and #7465
• Documentation: https://odin-lang.org/docs/inline-asm/
• ``` and """ strings to declare multi-line string literals that normalize indentation up to the closing quotation marks.

New Compiler Improvements

• Use posix_spawnp instead of system() when invoking the linker in #7485
• Fix default linker timing label on non-Windows platforms in #7240
• Fix odin doc -doc-format aborting on any package that imports another package in #7242
• Fix bigint negative printing in #7243
• Fix constant transmute from unsigned to signed wrapping one value too many in #7244
• Handle #soa fixed compound literals for vars in #7239
• Validate floating-point array counts as integers in #7251
• Fix typo in enumerated array in #7252
• Make redeclaration diagnostics stable under threading in #7253
• Improve procedure group overload scoring in #7227
• Fix #7012 - a type isn't its own specialization in #7257
• Fixes swizzles on array elements in soa containers in #7259
• Fix Name Canonicalization Rotate Left typo in #7267
• Fix constant string16 carrying UTF-8, and inverted slice indices reaching substring in #7268
• Fixes chain indexing for array elements in #soa containers in #7270
• Fixes range loop over array elements in #soa containers in #7277
• Fix riscv64 ABI classification for padded, over-aligned, and pointer-bearing structs in #7282
• i386: Pass aggregate arguments by value on the stack in #7283
• i386: Return aggregates through the hidden pointer on System V targets in #7284
• Use enum value init expression instead of numeric value in doc format in #7289
• Remove dead simd_rem in #7269
• Fix duplicated name for temporary .ll files in #7291
• Don't clear the operand value on the simd success path in #7315
• Fix #7281, apply #max_field_align in #7314
• Add diagnostic for missing field name to type_field_bit_offset + type_field_bit_size in #7293
• Fix byte swap on untyped int-like untyped types in #7294
• Bound constant arguments before range-checking them in #7295
• type_is_comparable: false for an unspecialized polymorphic record in #7296
• Fix guards combining two required conditions with && in #7297
• Correct the endianness guard messages in #7301
• Make the three endianness predicates partition in #7307
• simd_extract_lsbs/simd_extract_msbs Reject a lane count that exceeds the bit_set limit in #7308
• Clarify type_has_shared_fields behavior in code doc in #7309
• Matrix: enforce the element limit on multiplication and on overflowing dimensions in #7310
• Hoist if stmt in enumerated_array in #7311
• Check enumerated array length in #7312
• check_matrix_type_hint: Require the element type and layout to match in #7313
• Fixes f32 to 64-bit int/uint conversion in #7319
• Fixes float to 128-bit int/uint conversion in #7321
• Classify amd64/arm64 aggregates from the source type in #7292
• Fix long -> int64_t for win64 in #7324
• Fix bit_field intrinsic by @kalsprite in #7325
• Fix out of bounds for zero arg #load_directory in #7329
• Fix compilation error when using the fixed-point write procedure and -vet-unused in #7330
• Fix backend support for #unroll on [dynamic]T in #7337
• Fix bit_set upper endpoint representability check in #7340
• fix bit_set subset/superset constant folding in #7346
• Fix three faults in &~ constant folding in #7345
• Enforce the #simd construction rules and stop two crashes in #7344
• intrinsics.type_integer_to_unsigned(rune) returns f16 in #7343
• quaternion and complex nan cmp & accessors in #7342
• Improved stable sort, from insertion_sort to merge_rotate in #7349
• Set console codepage to utf-8 (on Windows), and restore old one on exit in #7351
• Reenables LLVMSetUnnamedAddress for global constants merging in #7333
• Range-check a constant passed to an #any_int parameter in #7360
• Add the missing break in add_min_dep_type_info in #7359
• riscv64: Read a flattened aggregate's members from their real offsets in #7334
• Fix eol diagnostic in #7358
• Fixes the %% operator in #7353
• Fix SIGBUS/segfault when compiling recursive #soa slice/dynamic array types in #7361
• ABI Conformance harness + fixes in #7327
• Fix c_va_start guard and c_va_arg format mismatch in #7367
• riscv64: use a slice for the coerce offsets + missed arm in riscv ABI in #7368
• Reject a built-in procedure assigned to in #7369
• Do not register map runtime dependencies under bedrock in #7371
• Range-check the constant abs folds in #7372
• Fix #7377 in #7378
• Let FreeBSD use default gb_copy_file path in #7381
• Add AVX-512 VNNI VPDPWSSD support to inline assembly in #7380
• A base prefix with only digit separators has no digits in #7370
• A bit_fìeld constant is range-checked only while it is untyped in #7385
• A self-referential bit_field hangs the compiler in #7390
• Codegen worker must not exit process with running siblings in #7391
• Multi-instruction asm template computed with one operand twice in #7393
• extend family emits mnemonic that doesn't exist in #7392
• Let compiler check error() fmt strings + fixes in #7395
• Peel union constant to its variant in #7396
• complex and quaternion take their type from their arguments in #7399
• A union constant in a ternary or builds an ill-typed phi #7397
• Implement fixes for constant unions in #7087
• Only reuse a compound literal's storage for a variable of its type in #7400
• Fix or_else diverging with single return value in #7394
• Remove the os.Error == 0 compatibility hack in #7403
• Restore the Did you want 'nil'? diagnostic everywhere in #7405
• Address printf format warning in #7404
• Better hints when assigning or comparing to 0 when it is not allowed in #7407
• Fix reordered compound literal comparison in #7409
• Fix compiler panic on a selector into #branch_location in #7415
• Fix compiler segfault on distinct of a type alias that cycles back in #7416
• Fix segfault comparing two foreign declarations of the same symbol in #7417
• Fix compiler segfault on a bare .. in a type position call in #7418
• Asm cast guard in #7437
• Reject asm operands in slots only a named hardware register can fill in #7431
• Diagnose in an asm template instead of aborting with SIGILL in #7434
• Fix -no-crt on Windows in #7426
• Fixes -o:size in #7440
• string_split_iterator fix in #7445
• Big endian bool cmp in #7448
• Fix min(T) % -1 kills the process with SIGFPE, at every hardware width in #7450
• Fix canonical names for types in procedure literals in #7439
• Inline asm templates - CFG based analysis in #7444
• Normalize bool cmp in #7449
• Reject a non-constant argument to an asm template's immediate in #7432
• Add missing i128le, i128be to endian switch in #7459
• Convert constants before narrowing to i64 in the remaining checker sites in #7460
• Delete dead code that crashed the checker on an asm template group with no parameters in #7435
• Fix a swizzle target in a multi-assignment reading an already-written source in #7458
• Broadcast a constant into every array level in #7457
• Give asm templates a documentation category instead of a blank header and a null %s in #7438
• Do not deduplicate cases in tagless switches in #7468

New Packages

Package Improvements

• [core:unicode/utf8] Fix truncated text for grapheme clusters in #7003
• [core:thread] Clarify completed task handling in thread pools in #7247
• [core:simd] Fix grammar in #7203
• [core:bytes] Optimize index_any with a byte bitset in #7255
• [core:simd/arm] Implement simd arm neon table lookup in #7256
• [core:odin/tokenizer] Fix broken double-checked lock in init in #7258
• [core:sys/windows] Add UnregisterHotKey in #7264
• [core:odin/parser] Fix unparenthesized attributes missing end position in its AST node in #7265
• [vendor:box3d] Add Box3D support for WebAssembly in #7266
• [core:simd/arm] Fix simd arm neon table lookup on big endian in #7273
• [core:unicode/utf8] + [core:text/edit] Add text field to utf8.Grapheme, fix caret translation by grapheme in #7274
• [base:runtime] Fixes non_zero_append_elem_fixed_capacity_string in #7317
• [base:runtime] Adds the pop family of procedures for #soa arrays in #7290
• [core:simd/arm] Implement simd arm neon extended table lookup in #7275
• [core:simd/arm] Implement simd arm neon logical in #7332
• [core:encoding/hex] Add non-allocating decode_into_buffer in #7347
• [base:runtime] Fix #7262. Do not free the original block on a failed heap resize in #7328
• [core:os] Fix #7350 in #7352
• [core:mem] Keep Dynamic_Arena allocations aligned after reset in #7355
• [core:slice] Fix slice.get doing unnecessary bounds check in #7363
• [core:slice] Fix slice.simple_equal misbehaviour on empty slice with non-nil data in #7364
• [core:image/tga] Fix .alpha_add_if_missing for TGA in #7366
• [core:sys/windows] Fix FILE_NOTIFY_INFORMATION struct member casing in #7374
• [core:odin] Remove inline and no_inline keywords in #7375
• [core:sys/wasm/js] Support shared WebAssembly memory in browser APIs in #7272
• [core:container/handle_map] Nicer organization, fix broken test, add test in #7383
• [core:rexcode/x86] Merge tables in #7384
• [core:thread] An exiting worker must not leave published in #7388
• [core:rexcode] Improvements in #7362
• [core:image/jpeg] Fixed negative read bug in #7410
• [core:hash] Add murmur3 implementation in #7419
• [core:nbio] Fix use-after-free, spurious poll readiness, and double completion on Windows in #7401
• [vendor:raylib] Fixed typo in raylib.odin in #7451
• [core:os] Fix simple typo in process.odin in #7454
• [core:fmt] Fill left-justified field with spaces in #7461
• [core:sys/darwin/Foundation] Skip Cocoa import on iOS in #7424
• [vendor:libc-shim] Fix typo in sched.odin in #7456
• [core:fmt] Fix justified printing of 0 producing all spaces in #7463
• [core:unicode/utf8] Fix #5939 grapheme cluster width in #7462
• [core:debug/trace] Remove os, fmt, slice, and strconv imports in #7408
• [core:os] add device to File_Info by @laytan in #7466
• [core:odin/parser] Improve parsing field docs and comments in #7481
• [core:net] Use explicitly passed allocators in #7480
• [core:encoding/json] Fix leak of key and value of a malformed object in #7487

Miscellaneous

• Explicitly specify all required LLVM components on Linux build in #7338
• Remove faulty tests in #7446
• Remove -microarch:native from 3 Windows tests and tweak Win test runner in #7455
• Add regression test for #7336 in #7428

Full Changelog: dev-2026-08...dev-2026-09