c40877d095
Somtimes when we're breaking up a large vector copy into several smaller ones, not every single smaller source registers are initialized at the time when the original COPY happens, and the verifier will not be pleased when seeing the smaller copies reading from an undef register. This patch is a workaround for the said issue by attaching an implicit read of the source operand on the newly generated copies. This is tested by llvm/test/CodeGen/RISCV/rvv/vector-interleave.ll which would have crashed the compiler without this fix when LLVM_EXPENSIVE_CHECK is enabled. Original context: https://github.com/llvm/llvm-project/pull/124825#issuecomment-2639097531 --------- Co-authored-by: Craig Topper <craig.topper@sifive.com>
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