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Mojo function
opaque_u32
def opaque_u32(x: UInt32) -> UInt32
Returns x through a copy LLVM can neither hoist nor merge.
Epilogue addresses derive only from the thread's row, so LLVM hoists them to the kernel entry (merging them across call sites) and they stay live through the main loop, where ptxas spills them. Deriving them from this copy pins the arithmetic at its use; the 2Q d128 kernel spilled 28 B without it.
Returns: