Odin Files

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 https://github.com/odin-lang/Odin/pull/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

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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 https://github.com/odin-lang/Odin/pull/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: https://github.com/odin-lang/Odin/compare/dev-2026-08...dev-2026-09