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auto merge of #15970 : Zoxc/rust/noalias-ref, r=cmr 

This add the LLVM noalias attribute to parameters of a
shared reference type (&) which have a safe interior.
This commit is contained in:
bors 2014-07-25 12:11:08 +00:00
parent 470dbef29a 4c2d4cd3de
commit 44019c79e0
1 changed files with 4 additions and 1 deletions
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5
src/librustc/middle/trans/base.rs
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@ -2140,7 +2140,10 @@ pub fn get_fn_llvm_attributes(ccx: &CrateContext, fn_ty: ty::t)
attrs.push((idx, llvm::NonNullAttribute as u64));
}
// `&mut` pointer parameters never alias other parameters, or mutable global data
ty::ty_rptr(b, mt) if mt.mutbl == ast::MutMutable => {
// `&` pointer parameters never alias either (for LLVM's purposes) as long as the
// interior is safe
ty::ty_rptr(b, mt) if mt.mutbl == ast::MutMutable ||
!ty::type_contents(ccx.tcx(), mt.ty).interior_unsafe() => {
attrs.push((idx, llvm::NoAliasAttribute as u64));
attrs.push((idx, llvm::NonNullAttribute as u64));
match b {