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LLVM 18 x86 data layout update

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With https://reviews.llvm.org/D86310 LLVM now has i128 aligned to
16-bytes on x86 based platforms. This will be in LLVM-18. This patch
updates all our spec targets to be 16-byte aligned, and removes the
alignment when speaking to older LLVM.

This results in Rust overaligning things relative to LLVM on older LLVMs.

This alignment change was discussed in rust-lang/compiler-team#683

See #54341 for additional information about why this is happening and
where this will be useful in the future.

This *does not* stabilize `i128`/`u128` for FFI.
This commit is contained in:
Matthew Maurer 2023-10-12 17:36:01 +00:00 • committed by Nikita Popov
parent 16fadb3f25
commit dbff90c2a7
51 changed files with 103 additions and 85 deletions
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8
compiler/rustc_ast/src/ast.rs
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@ -3304,9 +3304,13 @@ mod size_asserts {
static_assert_size!(Impl, 136);
static_assert_size!(Item, 136);
static_assert_size!(ItemKind, 64);
static_assert_size!(LitKind, 24);
// This can be removed after i128:128 is in the bootstrap compiler's target.
#[cfg(not(bootstrap))]
static_assert_size!(LitKind, 32);
static_assert_size!(Local, 72);
static_assert_size!(MetaItemLit, 40);
// This can be removed after i128:128 is in the bootstrap compiler's target.
#[cfg(not(bootstrap))]
static_assert_size!(MetaItemLit, 48);
static_assert_size!(Param, 40);
static_assert_size!(Pat, 72);
static_assert_size!(Path, 24);