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Stabilize passing 128-bit integers via vector registers with asm! on x86 - #2313
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Co-authored-by: Eric Huss <eric@huss.org>
folkertdev
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July 28, 2026 18:08
JonathanBrouwer added a commit
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… r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang#151059 ## Open questions None. r? Amanieu
jhpratt added a commit
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… r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang#151059 ## Open questions None. r? Amanieu
jhpratt added a commit
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Aug 2, 2026
… r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang#151059 ## Open questions None. r? Amanieu
JonathanBrouwer added a commit
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Aug 2, 2026
… r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang#151059 ## Open questions None. r? Amanieu
JonathanBrouwer added a commit
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Aug 2, 2026
… r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang#151059 ## Open questions None. r? Amanieu
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Aug 2, 2026
Rollup merge of #159525 - folkertdev:stabilize-x86-i128-asm, r=Amanieu Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: #133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - #151059 ## Open questions None. r? Amanieu
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WhySoBad pushed a commit
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Aug 5, 2026
Stabilize passing 128-bit integers via vector registers with `asm!` on x86 tracking issue: rust-lang/rust#133416 reference PR: rust-lang/reference#2313 # Stabilization report ## Summary Stabilize passing 128-bit integers via vector registers with `asm!` on x86 and x86_64: ```rust // Use 128-bit integers with vector registers. let mut v = 0u128; asm!("/* {:x} */", in(xmm_reg) v); asm!("/* {:x} */", out(xmm_reg) v); asm!("/* {:y} */", in(ymm_reg) v); asm!("/* {:y} */", out(ymm_reg) v); asm!("/* {:z} */", in(zmm_reg) v); asm!("/* {:z} */", out(zmm_reg) v); ``` 32-bit and 64-bit integer types can already be passed via vector registers. LLVM has supported 128-bit integers since 2019, see llvm/llvm-project#42502, so `rustc` not supporting them seems like an oversight. This feature is part of [`asm_experimental_reg`](rust-lang/rust#133416). We're not stabilizing that feature as a whole, but only pull out part of it. ## History - rust-lang/rust#151059 ## Open questions None. r? Amanieu
jhpratt added a commit
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Aug 11, 2026
Update books ## rust-lang/reference 9 commits in afdc77bab886d4455c11247cdd32391bfab636ae..82da570bafd9efed421bdbae0f8603ede8dd308b 2026-08-08 22:04:17 UTC to 2026-07-28 18:20:15 UTC - add c-variadic function definitions (rust-lang/reference#2177) - Update `no_mangle` to use the attribute template (rust-lang/reference#1904) - enums with fields: clarify that repr(C, int) is quite different from repr(int) (rust-lang/reference#2227) - aliasing rules also apply inside private fields (rust-lang/reference#2304) - attributes: do not explain syntax in rules (rust-lang/reference#2306) - Document prohibition on inner attribute macros (rust-lang/reference#2311) - Use authentication for linkcheck (rust-lang/reference#2319) - Stabilize passing 128-bit integers via vector registers with `asm!` on x86 (rust-lang/reference#2313) - Add a rule for attribute macro outline modules (rust-lang/reference#2310)
rust-timer added a commit
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Aug 11, 2026
Rollup merge of #160866 - rustbot:docs-update, r=traviscross Update books ## rust-lang/reference 9 commits in afdc77bab886d4455c11247cdd32391bfab636ae..82da570bafd9efed421bdbae0f8603ede8dd308b 2026-08-08 22:04:17 UTC to 2026-07-28 18:20:15 UTC - add c-variadic function definitions (rust-lang/reference#2177) - Update `no_mangle` to use the attribute template (rust-lang/reference#1904) - enums with fields: clarify that repr(C, int) is quite different from repr(int) (rust-lang/reference#2227) - aliasing rules also apply inside private fields (rust-lang/reference#2304) - attributes: do not explain syntax in rules (rust-lang/reference#2306) - Document prohibition on inner attribute macros (rust-lang/reference#2311) - Use authentication for linkcheck (rust-lang/reference#2319) - Stabilize passing 128-bit integers via vector registers with `asm!` on x86 (rust-lang/reference#2313) - Add a rule for attribute macro outline modules (rust-lang/reference#2310)
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I believe that this is the only change that is needed.
Stabilization PR: rust-lang/rust#159525
Tracking Issue: rust-lang/rust#133416