From: bors <bors@rust-lang.org>
Date: Sat, 22 Apr 2017 11:50:40 +0000 (+0000)
Subject: Auto merge of #39999 - bitshifter:struct_align, r=eddyb
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=6d841da4a0d7629f826117f99052e3d4a7997a7e;p=rust.git

Auto merge of #39999 - bitshifter:struct_align, r=eddyb

Implementation of repr struct alignment RFC 1358.

The main changes around rustc::ty::Layout::struct:
* Added abi_align field which stores abi alignment before repr align is applied
* align field contains transitive repr alignment
* Added padding vec which stores padding required after fields

The main user of this information is rustc_trans::adt::struct_llfields
which determines the LLVM fields to be used by LLVM, including padding
fields.

A possible future optimisation would be to put the padding Vec in an Option, since it will be unused unless you are using repr align.
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6d841da4a0d7629f826117f99052e3d4a7997a7e