[llvm-commits] Patch for scalarized division.

[Sjodin, Jan]

In LegalizeVectorOps the resulting scalar divisions must not be
generated if they have undefined vector elements as operands. This may
be unsafe because the divides can cause division by zero exceptions,
and also slows down the code. This patch attempts to fix this issue by
checking if the operands are defined or not. I would be grateful if
someone could review this patch. Thanks!

- Jan Sjodin
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