bjoernager/rust
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Use preserve_mostcc for extern "rust-cold"

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As experimentation in 115242 has shown looks better than `coldcc`.

And *don't* use a different convention for cold on Windows, because that actually ends up making things worse.

cc tracking issue 97544
This commit is contained in:
Scott McMurray 2023-08-26 17:42:59 -07:00
parent 22d41ae90f
commit 754f488d46
9 changed files with 71 additions and 23 deletions
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2
compiler/rustc_codegen_cranelift/src/abi/mod.rs
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@ -39,7 +39,7 @@ fn clif_sig_from_fn_abi<'tcx>(
pub(crate) fn conv_to_call_conv(sess: &Session, c: Conv, default_call_conv: CallConv) -> CallConv {
match c {
Conv::Rust | Conv::C => default_call_conv,
Conv::RustCold => CallConv::Cold,
Conv::Cold | Conv::PreserveMost | Conv::PreserveAll => CallConv::Cold,
Conv::X86_64SysV => CallConv::SystemV,
Conv::X86_64Win64 => CallConv::WindowsFastcall,