Fix assertion on splat of groupshared scalar #6930
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When splatting a groupshared scalar, we would trip an "Invalid constantexpr cast!" assertion. This would happen while evaluating the ImplicitCastExpr to turn the groupshared scalar into a vector because the scalar expression was in a different address space (groupshared) vs the target vector (local). The fix is to ensure that when looking up the vector member expression, insert an lvalue-to-rvalue cast if necessary; i.e. when a swizzle contains duplicate elements.
python3kgae
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Sep 24, 2024
llvm-beanz
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llvm-beanz
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Sep 24, 2024
SjMxr233
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Jul 24, 2025
When splatting a groupshared scalar, we would trip an "Invalid constantexpr cast!" assertion. This would happen while evaluating the ImplicitCastExpr to turn the groupshared scalar into a vector because the scalar expression was in a different address space (groupshared) vs the target vector (local). The fix is to ensure that when looking up the vector member expression, insert an lvalue-to-rvalue cast if necessary; i.e. when a swizzle contains duplicate elements.
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When splatting a groupshared scalar, we would trip an "Invalid constantexpr cast!" assertion. This would happen while evaluating the ImplicitCastExpr to turn the groupshared scalar into a vector because the scalar expression was in a different address space (groupshared) vs the target vector (local). The fix is to ensure that when looking up the vector member expression, insert an lvalue-to-rvalue cast if necessary; i.e. when a swizzle contains duplicate elements.