In the canonical form of the shuffle the poison/undef operand is the second operand, the patch tries to emit canonical form for partial vectorization of the buildvector sequence. Also, this patch starts emitting freeze instruction for shuffles with undef indices if the second shuffle operan is undef, not poison.

In the canonical form of the shuffle the poison/undef operand is the second operand, the patch tries to emit canonical form for partial vectorization of the buildvector sequence. Also, this patch starts emitting freeze instruction for shuffles with undef indices if the second shuffle operan is undef, not poison. It is an initial step to D93818, where undef mask element are treated as returning poison value.

In the canonical form of the shuffle the poison/undef operand is the second operand, the patch tries to emit canonical form for partial vectorization of the buildvector sequence. Also, this patch starts emitting freeze instruction for shuffles with undef indices if the second shuffle operan is undef, not poison. It is an initial step to D93818, where undef mask element are treated as returning poison value.