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Correct codegen of ConstValue::Indirect scalar and scalar pair #116102

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merged 2 commits into from
Sep 26, 2023
Merged

Correct codegen of ConstValue::Indirect scalar and scalar pair #116102

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6992405
Tolerate non-ptr indirect scalars in codegen.
cjgillot Sep 19, 2023
ac0683b
Use correct offset when codegening mir::Const::Indirect.
cjgillot Sep 23, 2023
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23 changes: 11 additions & 12 deletions compiler/rustc_codegen_ssa/src/mir/operand.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -135,15 +135,14 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> {
assert_eq!(alloc_align, layout.align.abi);

let read_scalar = |start, size, s: abi::Scalar, ty| {
let val = alloc
.0
.read_scalar(
bx,
alloc_range(start, size),
/*read_provenance*/ matches!(s.primitive(), abi::Pointer(_)),
)
.unwrap();
bx.scalar_to_backend(val, s, ty)
match alloc.0.read_scalar(
bx,
alloc_range(start, size),
/*read_provenance*/ matches!(s.primitive(), abi::Pointer(_)),
) {
Ok(val) => bx.scalar_to_backend(val, s, ty),
Err(_) => bx.const_poison(ty),
}
};

// It may seem like all types with `Scalar` or `ScalarPair` ABI are fair game at this point.
Expand All @@ -156,18 +155,18 @@ impl<'a, 'tcx, V: CodegenObject> OperandRef<'tcx, V> {
Abi::Scalar(s @ abi::Scalar::Initialized { .. }) => {
let size = s.size(bx);
assert_eq!(size, layout.size, "abi::Scalar size does not match layout size");
let val = read_scalar(Size::ZERO, size, s, bx.type_ptr());
let val = read_scalar(offset, size, s, bx.backend_type(layout));
OperandRef { val: OperandValue::Immediate(val), layout }
}
Abi::ScalarPair(
a @ abi::Scalar::Initialized { .. },
b @ abi::Scalar::Initialized { .. },
) => {
let (a_size, b_size) = (a.size(bx), b.size(bx));
let b_offset = a_size.align_to(b.align(bx).abi);
let b_offset = (offset + a_size).align_to(b.align(bx).abi);
assert!(b_offset.bytes() > 0);
let a_val = read_scalar(
Size::ZERO,
offset,
a_size,
a,
bx.scalar_pair_element_backend_type(layout, 0, true),
Expand Down