all: unify big.Int zero checks, use common/math in more places #3716
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name old time/op new time/op delta PaddedBigBytes-8 71.1ns ± 5% 46.1ns ± 1% -35.15% (p=0.000 n=20+19) name old alloc/op new alloc/op delta PaddedBigBytes-8 48.0B ± 0% 32.0B ± 0% -33.33% (p=0.000 n=20+20)
Various checks were in use. This commit replaces them all with Int.Sign,
which is cheaper and less code.
eg templates:
func before(x *big.Int) bool { return x.BitLen() == 0 }
func after(x *big.Int) bool { return x.Sign() == 0 }
func before(x *big.Int) bool { return x.BitLen() > 0 }
func after(x *big.Int) bool { return x.Sign() != 0 }
func before(x *big.Int) int { return x.Cmp(common.Big0) }
func after(x *big.Int) int { return x.Sign() }
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@fjl, thanks for your PR! By analyzing the history of the files in this pull request, we identified @obscuren, @zsfelfoldi and @karalabe to be potential reviewers. |
karalabe
reviewed
Feb 27, 2017
| privkey = make([]byte, 32) | ||
| readBits(privkey, key.D) | ||
| return pubkey, privkey | ||
| return pubkey, math.PaddedBigBytes(key.D, 32) |
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Doesn't the original code to right padding and this one left padding?
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Ah no, I see readBits is filling from the back to the front.
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