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[book] More formatting.
Signed-off-by: Daira Hopwood <daira@jacaranda.org>
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@ -134,10 +134,12 @@ $$
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By gating the lookup expression on $q_{S1}$, we avoid the need to fill in unused cells with dummy values to pass the lookup argument. The optimized lookup value (using a default index of $0$) is:
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\begin{array}{lll}
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$$
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\begin{array}{ll}
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(&q_{S1} \cdot m_{i+1}, \\
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&q_{S1} \cdot x_{P,i} &+& (1 - q_{S1}) \cdot x_{P,0}, \\
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&q_{S1} \cdot y_{P,i} &+& (1 - q_{S1}) \cdot y_{P,0} \;\;\;)
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&q_{S1} \cdot x_{P,i} + (1 - q_{S1}) \cdot x_{P,0}, \\
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&q_{S1} \cdot y_{P,i} + (1 - q_{S1}) \cdot y_{P,0} \;\;\;)
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\end{array}
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$$
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This increases the degree of the lookup argument to $6$.
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