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auto merge of #6742 : Aatch/rust/mut-noalias, r=thestinger 

This marks `&mut` function arguments with the `noalias` attribute. Since the borrow checker enforces this property, this is worth doing.

I'm not sure if the place I'm doing it in is ideal, but it generates the correct code.

Closes #6350
This commit is contained in:
bors 2013-05-26 05:50:00 -07:00
parent 510d0f221c 2c2346e3d4
commit f254d119ea
1 changed files with 14 additions and 1 deletions
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15
src/librustc/middle/trans/base.rs
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@ -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
}
})
}