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Limited -Zregparm support (no Rust calling conv) descriptions

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Co-authored-by: Jubilee <workingjubilee@gmail.com>
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Andrew Zhogin 2024-10-20 18:18:01 +07:00 committed by GitHub
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commit 37dc4ec8d6
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2 changed files with 3 additions and 2 deletions
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3
compiler/rustc_session/src/options.rs
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@ -2002,7 +2002,8 @@ pub(crate) fn parse_mir_include_spans(slot: &mut MirIncludeSpans, v: Option<&str
"randomize the layout of types (default: no)"),
regparm: Option<u32> = (None, parse_opt_number, [TRACKED],
"On x86-32 targets, setting this to N causes the compiler to pass N arguments \
in registers EAX, EDX, and ECX instead of on the stack.\
in registers EAX, EDX, and ECX instead of on the stack for\
\"C\", \"cdecl\", and \"stdcall\" fn.\
It is UNSOUND to link together crates that use different values for this flag!"),
relax_elf_relocations: Option<bool> = (None, parse_opt_bool, [TRACKED],
"whether ELF relocations can be relaxed"),

2
src/doc/unstable-book/src/compiler-flags/regparm.md
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@ -5,7 +5,7 @@ The tracking issue for this feature is: https://github.com/rust-lang/rust/issues
------------------------
Option -Zregparm=N causes the compiler to pass N arguments
in registers EAX, EDX, and ECX instead of on the stack.
in registers EAX, EDX, and ECX instead of on the stack for "C", "cdecl", and "stdcall" fn.
It is UNSOUND to link together crates that use different values for this flag.
It is only supported on `x86`.