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Stop using LLVM struct types for byval/sret #122050

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merged 6 commits into from
Mar 11, 2024
Merged

Stop using LLVM struct types for byval/sret #122050

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96a7267
use [N x i8] for byval/sret types
erikdesjardins Feb 25, 2024
c56ffaa
fix now-incorrect parenthetical about byval attr
erikdesjardins Mar 7, 2024
38324a1
improve byval abi docs
erikdesjardins Mar 9, 2024
549eac3
once byval abi is computed, the target abi isn't used further
erikdesjardins Mar 9, 2024
8fdd5e0
convert codegen/repr/transparent-* tests to no_core, fix discrepancies
erikdesjardins Mar 10, 2024
f18c2f8
add -O to some tests which depend on attributes being added
erikdesjardins Mar 10, 2024
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20 changes: 16 additions & 4 deletions compiler/rustc_codegen_llvm/src/abi.rs
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Sounds like the docs at https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_llvm/abi/enum.PassMode.html#variant.Indirect should be updated then? Currently they say

This corresponds to the byval LLVM argument attribute (using the Rust type of this argument).

The parenthetical is no longer true with this patch.

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Removed the parenthetical. The important part is that byval is used, the specific type is not so important (it could be [N x i8], iM, the Rust struct type, etc.)

Original file line number Diff line number Diff line change
Expand Up @@ -424,7 +424,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Indirect { attrs, meta_attrs: _, on_stack } => {
assert!(!on_stack);
let i = apply(attrs);
let sret = llvm::CreateStructRetAttr(cx.llcx, self.ret.layout.llvm_type(cx));
let sret = llvm::CreateStructRetAttr(
cx.llcx,
cx.type_array(cx.type_i8(), self.ret.layout.size.bytes()),
);
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Argument(i), &[sret]);
}
PassMode::Cast { cast, pad_i32: _ } => {
Expand All @@ -437,7 +440,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Ignore => {}
PassMode::Indirect { attrs, meta_attrs: None, on_stack: true } => {
let i = apply(attrs);
let byval = llvm::CreateByValAttr(cx.llcx, arg.layout.llvm_type(cx));
let byval = llvm::CreateByValAttr(
cx.llcx,
cx.type_array(cx.type_i8(), arg.layout.size.bytes()),
);
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Argument(i), &[byval]);
}
PassMode::Direct(attrs)
Expand Down Expand Up @@ -486,7 +492,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Indirect { attrs, meta_attrs: _, on_stack } => {
assert!(!on_stack);
let i = apply(bx.cx, attrs);
let sret = llvm::CreateStructRetAttr(bx.cx.llcx, self.ret.layout.llvm_type(bx));
let sret = llvm::CreateStructRetAttr(
bx.cx.llcx,
bx.cx.type_array(bx.cx.type_i8(), self.ret.layout.size.bytes()),
);
attributes::apply_to_callsite(callsite, llvm::AttributePlace::Argument(i), &[sret]);
}
PassMode::Cast { cast, pad_i32: _ } => {
Expand All @@ -513,7 +522,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Ignore => {}
PassMode::Indirect { attrs, meta_attrs: None, on_stack: true } => {
let i = apply(bx.cx, attrs);
let byval = llvm::CreateByValAttr(bx.cx.llcx, arg.layout.llvm_type(bx));
let byval = llvm::CreateByValAttr(
bx.cx.llcx,
bx.cx.type_array(bx.cx.type_i8(), arg.layout.size.bytes()),
);
attributes::apply_to_callsite(
callsite,
llvm::AttributePlace::Argument(i),
Expand Down
37 changes: 33 additions & 4 deletions compiler/rustc_target/src/abi/call/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -46,16 +46,24 @@ pub enum PassMode {
///
/// The argument has a layout abi of `ScalarPair`.
Pair(ArgAttributes, ArgAttributes),
/// Pass the argument after casting it. See the `CastTarget` docs for details. The bool
/// indicates if a `Reg::i32()` dummy argument is emitted before the real argument.
/// Pass the argument after casting it. See the `CastTarget` docs for details.
///
/// `pad_i32` indicates if a `Reg::i32()` dummy argument is emitted before the real argument.
Cast { pad_i32: bool, cast: Box<CastTarget> },
/// Pass the argument indirectly via a hidden pointer.
///
/// The `meta_attrs` value, if any, is for the metadata (vtable or length) of an unsized
/// argument. (This is the only mode that supports unsized arguments.)
///
/// `on_stack` defines that the value should be passed at a fixed stack offset in accordance to
/// the ABI rather than passed using a pointer. This corresponds to the `byval` LLVM argument
/// attribute (using the Rust type of this argument). `on_stack` cannot be true for unsized
/// arguments, i.e., when `meta_attrs` is `Some`.
/// attribute. The `byval` argument will use a byte array with the same size as the Rust type
/// (which ensures that padding is preserved and that we do not rely on LLVM's struct layout),
/// and will use the alignment specified in `attrs.pointee_align` (if `Some`) or the type's
/// alignment, depending on the target's ABI. This means that the alignment will not always
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/// match the Rust type's alignment; see documentation of `make_indirect_byval` for more info.
///
/// `on_stack` cannot be true for unsized arguments, i.e., when `meta_attrs` is `Some`.
Indirect { attrs: ArgAttributes, meta_attrs: Option<ArgAttributes>, on_stack: bool },
}

Expand Down Expand Up @@ -596,6 +604,8 @@ impl<'a, Ty> ArgAbi<'a, Ty> {
}
}

/// Pass this argument indirectly, by passing a (thin or fat) pointer to the argument instead.
/// This is valid for both sized and unsized arguments.
pub fn make_indirect(&mut self) {
match self.mode {
PassMode::Direct(_) | PassMode::Pair(_, _) => {
Expand All @@ -609,7 +619,26 @@ impl<'a, Ty> ArgAbi<'a, Ty> {
}
}

/// Pass this argument indirectly, by placing it at a fixed stack offset.
/// This corresponds to the `byval` LLVM argument attribute.
/// This is only valid for sized arguments.
///
/// `byval_align` specifies the alignment of the `byval` stack slot, which does not need to
/// correspond to the type's alignment. This will be `Some` if the target's ABI specifies that
/// stack slots used for arguments passed by-value have specific alignment requirements which
/// differ from the alignment used in other situations.
///
/// If `None`, the type's alignment is used.
///
/// If the resulting alignment differs from the type's alignment,
/// the argument will be copied to an alloca with sufficient alignment,
/// either in the caller (if the type's alignment is lower than the byval alignment)
/// or in the callee† (if the type's alignment is higher than the byval alignment),
/// to ensure that Rust code never sees an underaligned pointer.
///
/// † This is currently broken, see <https://github.com/rust-lang/rust/pull/122212>.
pub fn make_indirect_byval(&mut self, byval_align: Option<Align>) {
assert!(!self.layout.is_unsized(), "used byval ABI for unsized layout");
self.make_indirect();
match self.mode {
PassMode::Indirect { ref mut attrs, meta_attrs: _, ref mut on_stack } => {
Expand Down
2 changes: 2 additions & 0 deletions compiler/rustc_target/src/abi/call/x86_64.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -217,6 +217,8 @@ where
match cls_or_mem {
Err(Memory) => {
if is_arg {
// The x86_64 ABI doesn't have any special requirements for `byval` alignment,
// the type's alignment is always used.
arg.make_indirect_byval(None);
} else {
// `sret` parameter thus one less integer register available
Expand Down
8 changes: 4 additions & 4 deletions tests/codegen/align-byval-vector.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,12 +37,12 @@ pub struct DoubleFoo {
}

extern "C" {
// x86-linux: declare void @f({{.*}}byval(%Foo) align 4{{.*}})
// x86-darwin: declare void @f({{.*}}byval(%Foo) align 16{{.*}})
// x86-linux: declare void @f({{.*}}byval([32 x i8]) align 4{{.*}})
// x86-darwin: declare void @f({{.*}}byval([32 x i8]) align 16{{.*}})
fn f(foo: Foo);

// x86-linux: declare void @g({{.*}}byval(%DoubleFoo) align 4{{.*}})
// x86-darwin: declare void @g({{.*}}byval(%DoubleFoo) align 16{{.*}})
// x86-linux: declare void @g({{.*}}byval([64 x i8]) align 4{{.*}})
// x86-darwin: declare void @g({{.*}}byval([64 x i8]) align 16{{.*}})
fn g(foo: DoubleFoo);
}

Expand Down
92 changes: 46 additions & 46 deletions tests/codegen/align-byval.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -107,20 +107,20 @@ pub unsafe fn call_na1(x: NaturalAlign1) {
// CHECK: start:

// m68k: [[ALLOCA:%[a-z0-9+]]] = alloca %NaturalAlign1, align 1
// m68k: call void @natural_align_1({{.*}}byval(%NaturalAlign1) align 1{{.*}} [[ALLOCA]])
// m68k: call void @natural_align_1({{.*}}byval([2 x i8]) align 1{{.*}} [[ALLOCA]])

// wasm: [[ALLOCA:%[a-z0-9+]]] = alloca %NaturalAlign1, align 1
// wasm: call void @natural_align_1({{.*}}byval(%NaturalAlign1) align 1{{.*}} [[ALLOCA]])
// wasm: call void @natural_align_1({{.*}}byval([2 x i8]) align 1{{.*}} [[ALLOCA]])

// x86_64-linux: call void @natural_align_1(i16

// x86_64-windows: call void @natural_align_1(i16

// i686-linux: [[ALLOCA:%[a-z0-9+]]] = alloca %NaturalAlign1, align 4
// i686-linux: call void @natural_align_1({{.*}}byval(%NaturalAlign1) align 4{{.*}} [[ALLOCA]])
// i686-linux: call void @natural_align_1({{.*}}byval([2 x i8]) align 4{{.*}} [[ALLOCA]])

// i686-windows: [[ALLOCA:%[a-z0-9+]]] = alloca %NaturalAlign1, align 4
// i686-windows: call void @natural_align_1({{.*}}byval(%NaturalAlign1) align 4{{.*}} [[ALLOCA]])
// i686-windows: call void @natural_align_1({{.*}}byval([2 x i8]) align 4{{.*}} [[ALLOCA]])
natural_align_1(x);
}

Expand All @@ -135,10 +135,10 @@ pub unsafe fn call_na2(x: NaturalAlign2) {
// x86_64-windows-NEXT: call void @natural_align_2

// i686-linux: [[ALLOCA:%[0-9]+]] = alloca %NaturalAlign2, align 4
// i686-linux: call void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}} [[ALLOCA]])
// i686-linux: call void @natural_align_2({{.*}}byval([34 x i8]) align 4{{.*}} [[ALLOCA]])

// i686-windows: [[ALLOCA:%[0-9]+]] = alloca %NaturalAlign2, align 4
// i686-windows: call void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}} [[ALLOCA]])
// i686-windows: call void @natural_align_2({{.*}}byval([34 x i8]) align 4{{.*}} [[ALLOCA]])
natural_align_2(x);
}

Expand Down Expand Up @@ -199,141 +199,141 @@ pub unsafe fn call_fa16(x: ForceAlign16) {
}

extern "C" {
// m68k: declare void @natural_align_1({{.*}}byval(%NaturalAlign1) align 1{{.*}})
// m68k: declare void @natural_align_1({{.*}}byval([2 x i8]) align 1{{.*}})

// wasm: declare void @natural_align_1({{.*}}byval(%NaturalAlign1) align 1{{.*}})
// wasm: declare void @natural_align_1({{.*}}byval([2 x i8]) align 1{{.*}})

// x86_64-linux: declare void @natural_align_1(i16)

// x86_64-windows: declare void @natural_align_1(i16)

// i686-linux: declare void @natural_align_1({{.*}}byval(%NaturalAlign1) align 4{{.*}})
// i686-linux: declare void @natural_align_1({{.*}}byval([2 x i8]) align 4{{.*}})

// i686-windows: declare void @natural_align_1({{.*}}byval(%NaturalAlign1) align 4{{.*}})
// i686-windows: declare void @natural_align_1({{.*}}byval([2 x i8]) align 4{{.*}})
fn natural_align_1(x: NaturalAlign1);

// m68k: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
// m68k: declare void @natural_align_2({{.*}}byval([34 x i8]) align 2{{.*}})

// wasm: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
// wasm: declare void @natural_align_2({{.*}}byval([34 x i8]) align 2{{.*}})

// x86_64-linux: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 2{{.*}})
// x86_64-linux: declare void @natural_align_2({{.*}}byval([34 x i8]) align 2{{.*}})

// x86_64-windows: declare void @natural_align_2(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 2{{.*}})

// i686-linux: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}})
// i686-linux: declare void @natural_align_2({{.*}}byval([34 x i8]) align 4{{.*}})

// i686-windows: declare void @natural_align_2({{.*}}byval(%NaturalAlign2) align 4{{.*}})
// i686-windows: declare void @natural_align_2({{.*}}byval([34 x i8]) align 4{{.*}})
fn natural_align_2(x: NaturalAlign2);

// m68k: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
// m68k: declare void @force_align_4({{.*}}byval([20 x i8]) align 4{{.*}})

// wasm: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
// wasm: declare void @force_align_4({{.*}}byval([20 x i8]) align 4{{.*}})

// x86_64-linux: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
// x86_64-linux: declare void @force_align_4({{.*}}byval([20 x i8]) align 4{{.*}})

// x86_64-windows: declare void @force_align_4(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 4{{.*}})

// i686-linux: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
// i686-linux: declare void @force_align_4({{.*}}byval([20 x i8]) align 4{{.*}})

// i686-windows: declare void @force_align_4({{.*}}byval(%ForceAlign4) align 4{{.*}})
// i686-windows: declare void @force_align_4({{.*}}byval([20 x i8]) align 4{{.*}})
fn force_align_4(x: ForceAlign4);

// m68k: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 4{{.*}})
// m68k: declare void @natural_align_8({{.*}}byval([24 x i8]) align 4{{.*}})

// wasm: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 8{{.*}})
// wasm: declare void @natural_align_8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-linux: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 8{{.*}})
// x86_64-linux: declare void @natural_align_8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-windows: declare void @natural_align_8(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 8{{.*}})

// i686-linux: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 4{{.*}})
// i686-linux: declare void @natural_align_8({{.*}}byval([24 x i8]) align 4{{.*}})

// i686-windows: declare void @natural_align_8({{.*}}byval(%NaturalAlign8) align 4{{.*}})
// i686-windows: declare void @natural_align_8({{.*}}byval([24 x i8]) align 4{{.*}})
fn natural_align_8(x: NaturalAlign8);

// m68k: declare void @force_align_8({{.*}}byval(%ForceAlign8) align 8{{.*}})
// m68k: declare void @force_align_8({{.*}}byval([24 x i8]) align 8{{.*}})

// wasm: declare void @force_align_8({{.*}}byval(%ForceAlign8) align 8{{.*}})
// wasm: declare void @force_align_8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-linux: declare void @force_align_8({{.*}}byval(%ForceAlign8) align 8{{.*}})
// x86_64-linux: declare void @force_align_8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-windows: declare void @force_align_8(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 8{{.*}})

// i686-linux: declare void @force_align_8({{.*}}byval(%ForceAlign8) align 4{{.*}})
// i686-linux: declare void @force_align_8({{.*}}byval([24 x i8]) align 4{{.*}})

// i686-windows: declare void @force_align_8(
// i686-windows-NOT: byval
// i686-windows-SAME: align 8{{.*}})
fn force_align_8(x: ForceAlign8);

// m68k: declare void @lower_fa8({{.*}}byval(%LowerFA8) align 4{{.*}})
// m68k: declare void @lower_fa8({{.*}}byval([24 x i8]) align 4{{.*}})

// wasm: declare void @lower_fa8({{.*}}byval(%LowerFA8) align 8{{.*}})
// wasm: declare void @lower_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-linux: declare void @lower_fa8({{.*}}byval(%LowerFA8) align 8{{.*}})
// x86_64-linux: declare void @lower_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-windows: declare void @lower_fa8(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 8{{.*}})

// i686-linux: declare void @lower_fa8({{.*}}byval(%LowerFA8) align 4{{.*}})
// i686-linux: declare void @lower_fa8({{.*}}byval([24 x i8]) align 4{{.*}})

// i686-windows: declare void @lower_fa8({{.*}}byval(%LowerFA8) align 4{{.*}})
// i686-windows: declare void @lower_fa8({{.*}}byval([24 x i8]) align 4{{.*}})
fn lower_fa8(x: LowerFA8);

// m68k: declare void @wrapped_fa8({{.*}}byval(%WrappedFA8) align 8{{.*}})
// m68k: declare void @wrapped_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// wasm: declare void @wrapped_fa8({{.*}}byval(%WrappedFA8) align 8{{.*}})
// wasm: declare void @wrapped_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-linux: declare void @wrapped_fa8({{.*}}byval(%WrappedFA8) align 8{{.*}})
// x86_64-linux: declare void @wrapped_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-windows: declare void @wrapped_fa8(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 8{{.*}})

// i686-linux: declare void @wrapped_fa8({{.*}}byval(%WrappedFA8) align 4{{.*}})
// i686-linux: declare void @wrapped_fa8({{.*}}byval([24 x i8]) align 4{{.*}})

// i686-windows: declare void @wrapped_fa8(
// i686-windows-NOT: byval
// i686-windows-SAME: align 8{{.*}})
fn wrapped_fa8(x: WrappedFA8);

// m68k: declare void @transparent_fa8({{.*}}byval(%TransparentFA8) align 8{{.*}})
// m68k: declare void @transparent_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// wasm: declare void @transparent_fa8({{.*}}byval(%TransparentFA8) align 8{{.*}})
// wasm: declare void @transparent_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-linux: declare void @transparent_fa8({{.*}}byval(%TransparentFA8) align 8{{.*}})
// x86_64-linux: declare void @transparent_fa8({{.*}}byval([24 x i8]) align 8{{.*}})

// x86_64-windows: declare void @transparent_fa8(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 8{{.*}})

// i686-linux: declare void @transparent_fa8({{.*}}byval(%TransparentFA8) align 4{{.*}})
// i686-linux: declare void @transparent_fa8({{.*}}byval([24 x i8]) align 4{{.*}})

// i686-windows: declare void @transparent_fa8(
// i686-windows-NOT: byval
// i686-windows-SAME: align 8{{.*}})
fn transparent_fa8(x: TransparentFA8);

// m68k: declare void @force_align_16({{.*}}byval(%ForceAlign16) align 16{{.*}})
// m68k: declare void @force_align_16({{.*}}byval([80 x i8]) align 16{{.*}})

// wasm: declare void @force_align_16({{.*}}byval(%ForceAlign16) align 16{{.*}})
// wasm: declare void @force_align_16({{.*}}byval([80 x i8]) align 16{{.*}})

// x86_64-linux: declare void @force_align_16({{.*}}byval(%ForceAlign16) align 16{{.*}})
// x86_64-linux: declare void @force_align_16({{.*}}byval([80 x i8]) align 16{{.*}})

// x86_64-windows: declare void @force_align_16(
// x86_64-windows-NOT: byval
// x86_64-windows-SAME: align 16{{.*}})

// i686-linux: declare void @force_align_16({{.*}}byval(%ForceAlign16) align 4{{.*}})
// i686-linux: declare void @force_align_16({{.*}}byval([80 x i8]) align 4{{.*}})

// i686-windows: declare void @force_align_16(
// i686-windows-NOT: byval
Expand Down
1 change: 0 additions & 1 deletion tests/codegen/align-enum.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@ pub enum Align64 {
A(u32),
B(u32),
}
// CHECK: %Align64 = type { i32, [15 x i32] }

pub struct Nested64 {
a: u8,
Expand Down
4 changes: 0 additions & 4 deletions tests/codegen/align-struct.rs
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Expand Up @@ -5,27 +5,23 @@

#[repr(align(64))]
pub struct Align64(i32);
// CHECK: %Align64 = type { i32, [15 x i32] }

pub struct Nested64 {
a: Align64,
b: i32,
c: i32,
d: i8,
}
// CHECK: %Nested64 = type { %Align64, i32, i32, i8, [55 x i8] }

pub enum Enum4 {
A(i32),
B(i32),
}
// No Aggregate type, and hence nothing in LLVM IR.

pub enum Enum64 {
A(Align64),
B(i32),
}
// CHECK: %Enum64 = type { i32, [31 x i32] }

// CHECK-LABEL: @align64
#[no_mangle]
Expand Down
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