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sm9/bn256: add comment for gfpNeg

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Sun Yimin 2023-06-21 09:02:09 +08:00 committed by GitHub
parent 5d101fb431
commit 2da0a9cebc
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sm9/bn256/gfp_generic.go
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@ -30,7 +30,7 @@ func gfpNeg(c, a *gfP) {
for i, pi := range p2 {
c[i], carry = bits.Sub64(pi, a[i], carry)
}
// really required
// required for "zero", bn256 treat infinity point as valid
gfpCarry(c, 0)
}