mirror of https://github.com/zcash/halo2.git
circuit: Add region layout diagrams for y_switch constraint
Helps to see why we can't optimise it to remove the `prev` query.
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@ -42,6 +42,11 @@ impl Config {
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/// addition gate (controlled by `q_mul`) already checks scalar decomposition for
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/// the other bits.
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pub(super) fn create_gate(&self, meta: &mut ConstraintSystem<pallas::Base>) {
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// | y_p | z_complete |
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// --------------------
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// | y_p | z_{i + 1} |
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// | | base_y |
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// | | z_i |
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meta.create_gate(
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"Decompose scalar for complete bits of variable-base mul",
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|meta| {
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@ -122,6 +127,12 @@ impl Config {
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// Each iteration uses 2 rows (two complete additions)
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let row = 2 * iter;
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// | x_p | y_p | x_qr | y_qr | z_complete |
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// ------------------------------------------
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// | U_x | U_y | acc_x | acc_y | z_{i + 1} | row + offset
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// |acc_x|acc_y|acc+U_x|acc+U_y| base_y |
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// | | | res_x | res_y | z_i |
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// Update `z`.
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z = {
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// z_next = z_cur * 2 + k_next
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