59 lines
3.4 KiB
Plaintext
59 lines
3.4 KiB
Plaintext
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/***************************************************************************************************
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Each level on a SMTInsert has a state.
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The state of the level depends on the state of te botom level and on `xor` and
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`is0` signals.
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`isOldLev` 1 when is the level where oldLeaf is.
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`xor` signal is 0 if the index bit at the current level is the same in the old
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and the new index, and 1 if it is different.
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`is0` signal, is 1 if we are inserting in an empty leaf and 0 if we are inserting
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in a leaf that contains an element.
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The states are:
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top: While the index bits of the old and new insex in the top level is the same, whe are in the top state.
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old0 and old1: When the we reach insert level, we go to old0 and old1 states
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according to `is0` signal.
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btn: Once in old1 we go to btn until xor=1
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new1: This level is reached when xor=1. Here is where we insert the hash of the
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old and the new trees with just one element.
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na: Not appliable. After inserting it, we go to the na level.
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###########
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levIns==curLevel # #
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xor=0 is0=1 ┌────────────▶# old0 #────────┐
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┌─────┐ │ ## ## │
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│ │ │ ######### │ any
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│ ▼ │ │
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│ ########### │ │ ###########
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│ # # ────────────┘ └────────▶# #
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└──# top # # na #
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## ## ────┐ ┌──▶## ##
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######### │ │ #########
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│ │
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│ ########### ########### │ any
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levIns==curLevel │ # # xor=1 # # │
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is0=0 └───▶# old1 #─────────────▶# new1 #──┘
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## ## ## ##
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#########──┐ #########
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│ ▲
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│ ┌─────┘
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any │ ###########│ xor=1
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│ # #
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└─▶# btn #
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## ##
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#########◀───────┐
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│ │
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│ │
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└────────────┘
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xor=0
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***************************************************************************************************/
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state
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