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Mark &mut parameters as noalias #6742

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Merged
merged 1 commit into from
May 26, 2013
Merged

Mark &mut parameters as noalias #6742

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15 changes: 14 additions & 1 deletion src/librustc/middle/trans/base.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1694,7 +1694,20 @@ pub fn create_llargs_for_fn_args(cx: fn_ctxt,
vec::from_fn(args.len(), |i| {
unsafe {
let arg_n = first_real_arg + i;
llvm::LLVMGetParam(cx.llfn, arg_n as c_uint)
let arg = &args[i];
let llarg = llvm::LLVMGetParam(cx.llfn, arg_n as c_uint);

// Mark `&mut T` as no-alias, as the borrowck pass ensures it's true
match arg.ty.node {
ast::ty_rptr(_, mt) => {
if mt.mutbl == ast::m_mutbl {
llvm::LLVMAddAttribute(llarg, lib::llvm::NoAliasAttribute as c_uint);
}
}
_ => {}
}

llarg
}
})
}
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