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source 2007 Bernstein--Lange; source comments that these formulas use one temporary register
compute R1 = X1
compute R2 = Y1
compute R3 = Z1
compute R3 = c R3
compute R4 = R1^2
compute R1 = R1+R2
compute R1 = R1^2
compute R2 = R2^2
compute R3 = R3^2
compute R3 = 2 R3
compute R4 = R2+R4
compute R2 = 2 R2
compute R2 = R4-R2
compute R1 = R1-R4
compute R2 = R2 R4
compute R3 = R4-R3
compute R1 = R1 R3
compute R3 = R3 R4
compute R1 = c R1
compute R2 = c R2
compute X3 = R1
compute Y3 = R2
compute Z3 = R3
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