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Update platform-support.md to reflect improvements in returning floats on 32-bit x86

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beetrees 2024-04-13 01:48:22 +01:00
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src/doc/rustc/src/platform-support.md
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@ -41,10 +41,10 @@ target | notes
`x86_64-pc-windows-msvc` | 64-bit MSVC (Windows 10+)
`x86_64-unknown-linux-gnu` | 64-bit Linux (kernel 3.2+, glibc 2.17+)
[^x86_32-floats-return-ABI]: Due to limitations of the C ABI, floating-point support on `i686` targets is non-compliant: floating-point return values are passed via an x87 register, so NaN payload bits can be lost. See [issue #114479][x86-32-float-issue].
[^x86_32-floats-return-ABI]: Due to limitations of the C ABI, floating-point support on `i686` targets is non-compliant: floating-point return values are passed via an x87 register, so NaN payload bits can be lost. Functions with the default Rust ABI are not affected. See [issue #115567][x86-32-float-return-issue].
[77071]: https://github.com/rust-lang/rust/issues/77071
[x86-32-float-issue]: https://github.com/rust-lang/rust/issues/114479
[x86-32-float-return-issue]: https://github.com/rust-lang/rust/issues/115567
## Tier 1
@ -207,6 +207,8 @@ target | std | notes
[^x86_32-floats-x87]: Floating-point support on `i586` targets is non-compliant: the `x87` registers and instructions used for these targets do not provide IEEE-754-compliant behavior, in particular when it comes to rounding and NaN payload bits. See [issue #114479][x86-32-float-issue].
[x86-32-float-issue]: https://github.com/rust-lang/rust/issues/114479
[wasi-rename]: https://github.com/rust-lang/compiler-team/issues/607
[Fortanix ABI]: https://edp.fortanix.com/