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Auto merge of #81234 - repnop:fn-alignment, r=lcnr

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Allow specifying alignment for functions

Fixes #75072

This allows the user to specify alignment for functions, which can be useful for low level work where functions need to necessarily be aligned to a specific value.

I believe the error cases not covered in the match are caught earlier based on my testing so I had them just return `None`.
This commit is contained in:
bors 2021-04-06 04:35:26 +00:00
commit a6e7a5aa5d
18 changed files with 137 additions and 83 deletions
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3
compiler/rustc_codegen_llvm/src/attributes.rs
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@ -280,6 +280,9 @@ pub fn from_fn_attrs(cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value, instance: ty::
if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::CMSE_NONSECURE_ENTRY) {
llvm::AddFunctionAttrString(llfn, Function, cstr!("cmse_nonsecure_entry"));
}
if let Some(align) = codegen_fn_attrs.alignment {
llvm::set_alignment(llfn, align as usize);
}
sanitize(cx, codegen_fn_attrs.no_sanitize, llfn);
// Always annotate functions with the target-cpu they are compiled for.