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Fix divide by zero ICE #431

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Merged
merged 1 commit into from
Oct 9, 2025
Merged

Fix divide by zero ICE #431

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14 changes: 12 additions & 2 deletions crates/rustc_codegen_spirv/src/builder/builder_methods.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -767,8 +767,18 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
let stride = ty_kind.sizeof(self)?;
ty_size = MaybeSized::Sized(stride);

indices.push((offset.bytes() / stride.bytes()).try_into().ok()?);
offset = Size::from_bytes(offset.bytes() % stride.bytes());
if stride == Size::ZERO {
if offset != Size::ZERO {
trace!("zero-sized element with non-zero offset: {:?}", offset);
return None;
}

indices.push(0);
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Heh, got a conflict locally when rebasing on top of this PR, turns out I had a commit that included the indices.push(0); (but not the check - so I resolved the conflict by keeping the main version, i.e. the one from this PR), so that's probably an extra point in the favor of this being correct.

offset = Size::ZERO;
} else {
indices.push((offset.bytes() / stride.bytes()).try_into().ok()?);
offset = Size::from_bytes(offset.bytes() % stride.bytes());
}
}
_ => {
trace!("recovering access chain from SOMETHING ELSE, RETURNING NONE");
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15 changes: 15 additions & 0 deletions tests/compiletests/ui/lang/core/issue-424.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
// build-pass

#![no_std]

use core::marker::PhantomData;
use spirv_std::spirv;

pub struct BitSlice<T, O> {
_ord: PhantomData<O>,
_typ: PhantomData<[T]>,
_mem: [()],
}

#[spirv(compute(threads(1)))]
pub fn issue424() {}