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OpAccessChain on structs should take u32

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This commit is contained in:
khyperia 2020-09-24 18:31:19 +02:00
parent 3821aa2060
commit 7b45f88052
1 changed files with 6 additions and 1 deletions
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7
rustc_codegen_spirv/src/builder/builder_methods.rs
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@ -749,7 +749,12 @@ impl<'a, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'tcx> {
pointee: result_pointee_type,
}
.def(self);
let index_const = self.constant_u64(idx).def;
// Important! LLVM, and therefore intel-compute-runtime, require the `getelementptr` instruction (and therefore
// OpAccessChain) on structs to be a constant i32. Not i64! i32.
if idx > u32::MAX as u64 {
panic!("struct_gep bigger than u32::MAX");
}
let index_const = self.constant_u32(idx as u32).def;
self.emit()
.access_chain(result_type, None, ptr.def, [index_const].iter().cloned())
.unwrap()