Fix Hexagon ABI calling convention for small aggregates#151572
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rust-bors[bot] merged 2 commits intorust-lang:mainfrom Mar 12, 2026
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Fix Hexagon ABI calling convention for small aggregates#151572rust-bors[bot] merged 2 commits intorust-lang:mainfrom
rust-bors[bot] merged 2 commits intorust-lang:mainfrom
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Small structs (<= 64 bits) were being passed with their fields split into separate arguments instead of being packed into register-sized chunks. This caused ABI mismatches. The fix properly casts small aggregates to consecutive register-sized chunks using Uniform::consecutive(), matching the Hexagon C ABI where small structs are packed into R1:0 register pair. This fixes tests like extern-pass-TwoU16s.rs and extern-pass-TwoU8s.rs.
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Correct the handling of aggregate types in extern "C" functions to match the Hexagon ABI specification: - Aggregates up to 32 bits: passed/returned in a single register (R0) - Aggregates 33-64 bits: passed/returned in a register pair (R1:R0) - Aggregates > 64 bits: passed on stack via byval, returned via sret This fixes all tests/ui/abi/extern/ tests for Hexagon, including: - extern-pass-TwoU8s, extern-pass-TwoU16s, extern-pass-TwoU32s - extern-pass-TwoU64s, extern-pass-FiveU16s - extern-return-TwoU8s, extern-return-TwoU16s, extern-return-TwoU32s - extern-return-TwoU64s, extern-return-FiveU16s
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ping @SparrowLii |
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Can I do a @rustbot reroll ... ? |
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wesleywiser
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…ywiser Fix Hexagon ABI calling convention for small aggregates Small structs (<= 64 bits) were being passed with their fields split into separate arguments instead of being packed into register-sized chunks. This caused ABI mismatches. The fix properly casts small aggregates to consecutive register-sized chunks using Uniform::consecutive(), matching the Hexagon C ABI where small structs are packed into R1:0 register pair. This fixes tests like extern-pass-TwoU16s.rs and extern-pass-TwoU8s.rs.
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…uwer Rollup of 5 pull requests Successful merges: - #153751 (Detect existing turbofish on method calls to suppress useless suggestion) - #153780 (Remove `MTLock`) - #151194 (Fix wrong suggestion for returning async closure) - #151572 (Fix Hexagon ABI calling convention for small aggregates) - #153725 (Fix that `./x test --no-doc` actually keeps the same behaviour for backwards compatability)
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…uwer Rollup of 5 pull requests Successful merges: - #153705 (Always generate generics in delegation that match trait in trait impl scenario) - #153751 (Detect existing turbofish on method calls to suppress useless suggestion) - #153780 (Remove `MTLock`) - #151572 (Fix Hexagon ABI calling convention for small aggregates) - #153725 (Fix that `./x test --no-doc` actually keeps the same behaviour for backwards compatability)
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…uwer Rollup of 5 pull requests Successful merges: - rust-lang/rust#153705 (Always generate generics in delegation that match trait in trait impl scenario) - rust-lang/rust#153751 (Detect existing turbofish on method calls to suppress useless suggestion) - rust-lang/rust#153780 (Remove `MTLock`) - rust-lang/rust#151572 (Fix Hexagon ABI calling convention for small aggregates) - rust-lang/rust#153725 (Fix that `./x test --no-doc` actually keeps the same behaviour for backwards compatability)
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Small structs (<= 64 bits) were being passed with their fields split into separate arguments instead of being packed into register-sized chunks. This caused ABI mismatches.
The fix properly casts small aggregates to consecutive register-sized chunks using Uniform::consecutive(), matching the Hexagon C ABI where small structs are packed into R1:0 register pair.
This fixes tests like extern-pass-TwoU16s.rs and extern-pass-TwoU8s.rs.