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3 Commits

Author SHA1 Message Date
Ralf Jung
73b6482ead x86_win64 ABI: do not use xmm0 with softfloat ABI 2025-02-19 08:41:19 +01:00
Trevor Gross
a44a20ee4a Windows x86: Change i128 to return via the vector ABI 
Clang and GCC both return `i128` in xmm0 on windows-msvc and
windows-gnu. Currently, Rust returns the type on the stack. Add a
calling convention adjustment so we also return scalar `i128`s using the
vector ABI, which makes our `i128` compatible with C.

In the future, Clang may change to return `i128` on the stack for its
`-msvc` targets (more at [1]). If this happens, the change here will
need to be adjusted to only affect MinGW.

Link: https://github.com/rust-lang/rust/issues/134288
 2025-01-27 12:12:59 +00:00
Trevor Gross
581e0ac90c Introduce a test for the i128 calling convention on Windows 
Currently we both pass and return `i128` indirectly on Windows for MSVC
and MinGW, but this will be adjusted. Introduce a test verifying the
current state.
 2025-01-27 12:12:59 +00:00