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This repository was archived by the owner on May 28, 2025. It is now read-only.
Rollup merge of rust-lang#133102 - RalfJung:aarch64-softfloat, r=davidtwco,wesleywiser
aarch64 softfloat target: always pass floats in int registers
This is a part of rust-lang#131058: on softfloat aarch64 targets, the float registers may be unavailable. And yet, LLVM will happily use them to pass float types if the corresponding target features are enabled. That's a problem as it means enabling/disabling `neon` instructions can change the ABI.
Other targets have a `soft-float` target feature that forces the use of the soft-float ABI no matter whether float registers are enabled or not; aarch64 has nothing like that.
So we follow the aarch64 [softfloat ABI](rust-lang#131058 (comment)) and treat floats like integers for `extern "C"` functions. For the "Rust" ABI, we do the same for scalars, and then just do something reasonable for ScalarPair that avoids the pointer indirection.
Cc ```@workingjubilee```
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