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Add elementtype attributes for llvm.arm.ldrex/strex intrinsics

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These intrinsics (and a few more, but there are the only ones
exposed by stdarch) require an elementtype attribute in LLVM 15.
This commit is contained in:
Nikita Popov 2022-07-19 15:03:39 +02:00
parent ff693dc7b8
commit f653d3ab30
3 changed files with 41 additions and 0 deletions
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16
compiler/rustc_codegen_llvm/src/abi.rs
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@ -569,6 +569,22 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
&[cmse_nonsecure_call],
);
}
// Some intrinsics require that an elementtype attribute (with the pointee type of a
// pointer argument) is added to the callsite.
let element_type_index = unsafe { llvm::LLVMRustGetElementTypeArgIndex(callsite) };
if element_type_index >= 0 {
let arg_ty = self.args[element_type_index as usize].layout.ty;
let pointee_ty = arg_ty.builtin_deref(true).expect("Must be pointer argument").ty;
let element_type_attr = unsafe {
llvm::LLVMRustCreateElementTypeAttr(bx.llcx, bx.layout_of(pointee_ty).llvm_type(bx))
};
attributes::apply_to_callsite(
callsite,
llvm::AttributePlace::Argument(element_type_index as u32),
&[element_type_attr],
);
}
}
}