aef7e5768e
When `llvm.global_ctors` has no elements (e.g., when all resources are unused in a shader library), its initializer is a `zeroinitializer` (`ConstantAggregateZero`) rather than a `ConstantArray`. The previous code used `cast<ConstantArray>` which asserts on incompatible types: > "cast<Ty>() argument of incompatible type!" This patch uses `dyn_cast` and returns early if the initializer is not a `ConstantArray`, handling the edge case gracefully. Fixes #178993. Co-authored-by: Kaitlin Peng <kaitlinpeng@microsoft.com>
17 lines
507 B
LLVM
17 lines
507 B
LLVM
; RUN: opt -S -dxil-prepare < %s | FileCheck %s
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; Test that dxil-prepare handles llvm.global_ctors with zeroinitializer
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; (which is not a ConstantArray) without crashing.
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; Fixes https://github.com/llvm/llvm-project/issues/178993
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target triple = "dxil-unknown-shadermodel6.7-library"
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; An empty global_ctors array uses zeroinitializer, not ConstantArray
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@llvm.global_ctors = appending global [0 x { i32, ptr, ptr }] zeroinitializer
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; CHECK: define void @main()
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define void @main() {
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entry:
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ret void
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}
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