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8264104: Eliminate unnecessary vector mask conversion during VectorUnbox for floating point VectorMask #3238

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@@ -1233,8 +1233,10 @@ Node* VectorUnboxNode::Ideal(PhaseGVN* phase, bool can_reshape) {
bool is_vector_shuffle = vbox_klass->is_subclass_of(ciEnv::current()->vector_VectorShuffle_klass());
if (is_vector_mask) {
if (in_vt->length_in_bytes() == out_vt->length_in_bytes() &&
Matcher::match_rule_supported(Op_VectorMaskCast)) {
// VectorUnbox (VectorBox vmask) ==> VectorMaskCast (vmask)
Matcher::match_rule_supported_vector(Op_VectorMaskCast, out_vt->length(), out_vt->element_basic_type())) {
// Apply "VectorUnbox (VectorBox vmask) ==> VectorMaskCast (vmask)"
// directly. This could avoid the transformation ordering issue from
// "VectorStoreMask (VectorLoadMask vmask) => vmask".
return new VectorMaskCastNode(value, out_vt);
}
// VectorUnbox (VectorBox vmask) ==> VectorLoadMask (VectorStoreMask vmask)