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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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12
compiler/rustc_middle/src/mir/mod.rs
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@ -1672,13 +1672,19 @@ mod size_asserts {
use super::*;
use rustc_data_structures::static_assert_size;
// tidy-alphabetical-start
static_assert_size!(BasicBlockData<'_>, 136);
// This can be removed after i128:128 is in the bootstrap compiler's target.
#[cfg(not(bootstrap))]
static_assert_size!(BasicBlockData<'_>, 144);
static_assert_size!(LocalDecl<'_>, 40);
static_assert_size!(SourceScopeData<'_>, 72);
static_assert_size!(Statement<'_>, 32);
static_assert_size!(StatementKind<'_>, 16);
static_assert_size!(Terminator<'_>, 104);
static_assert_size!(TerminatorKind<'_>, 88);
// This can be removed after i128:128 is in the bootstrap compiler's target.
#[cfg(not(bootstrap))]
static_assert_size!(Terminator<'_>, 112);
// This can be removed after i128:128 is in the bootstrap compiler's target.
#[cfg(not(bootstrap))]
static_assert_size!(TerminatorKind<'_>, 96);
static_assert_size!(VarDebugInfo<'_>, 88);
// tidy-alphabetical-end
}