the columns into wide, overlapping limbs. // r0 = a0×b0 + 19×(a1×b4 + a2×b3 + a3×b2 + a4×b1) r0 := mul(a0, b0) r0 = addMul19(r0, a1, b4) r0 = addMul19(r0, a2, b3) r0 = addMul19(r0, a3, b2) r0 = addMul19(r0, a4, b1) // r1 = a0×b1 + a1×b0 + 19×(a2×b4 + a3×b3 + a4×b2) r1 := mul(a0, b1) r1 = addMul(r1, a1, b0) r1 = addMul19(r1, a2, b4) r1 = addMul19(r1, a3, b3) r1 = addMul19(r1, a4, b2) // r2 = a0×b2 + a1×b1 + a2×b0 + 19×(a3×b4 + a4×b3) r2 := mul(a0, b2) r2 = addMul(r2, a1, b1) r2 = addMul(r2, a2, b0)...

addMul64(r1, a4_19, b2) // r2 = a0×b2 + a1×b1 + a2×b0 + 19×(a3×b4 + a4×b3) r2 := mul64(a0, b2) r2 = addMul64(r2, a1, b1) r2 = addMul64(r2, a2, b0) r2 = addMul64(r2, a3_19, b4) r2 = addMul64(r2, a4_19, b3) // r3 = a0×b3 + a1×b2 + a2×b1 + a3×b0 + 19×a4×b4 r3 := mul64(a0, b3) r3 = addMul64(r3, a1, b2) r3 = addMul64(r3, a2, b1) r3 = addMul64(r3, a3, b0) r3 = addMul64(r3, a4_19, b4) // r4 = a0×b4 + a1×b3 + a2×b2 + a3×b1 + a4×b0 r4 := mul64(a0, b4) r4 = addMul64(r4, a1, b3) r4 = addMul64(r4, a2, b2) r4 =...

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