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05cccce580
It's tricky to figure out what it does (and how) without staring at the code for a long time. Document it to make it more transparent. No functional changes. Only comments added. Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>