internal/strconv: extract fixed-precision ftoa from ftoaryu.go
The fixed-precision ftoa algorithm is not actually
documented in the Ryū paper, and it is fairly
straightforward: multiply by a power of 10 to get
an integer that contains the digits we need.
There is also no need for separate float32 and float64
implementations.
This CL implements a new fixedFtoa, separate from Ryū.
The overall algorithm is the same, but the new code
is simpler, faster, and better documented.
Now ftoaryu.go is only about shortest-output formatting,
so if and when yet another algorithm comes along, it will
be clearer what should be replaced (all of ftoaryu.go)
and what should not (all of ftoafixed.go).
benchmark \ host linux-arm64 local linux-amd64 s7 linux-386 s7:GOARCH=386
vs base vs base vs base vs base vs base vs base
AppendFloat/Decimal -0.18% ~ ~ -0.68% +0.49% -0.79%
AppendFloat/Float +0.09% ~ +1.50% +0.84% -0.37% -0.69%
AppendFloat/Exp -0.51% ~ ~ +1.20% -1.27% -1.01%
AppendFloat/NegExp -1.01% ~ +3.43% +1.35% -2.33% ~
AppendFloat/LongExp -1.22% +0.77% ~ ~ -1.48% ~
AppendFloat/Big -2.07% ~ -2.07% -1.97% -2.89% -2.93%
AppendFloat/BinaryExp -0.28% +1.06% ~ +1.35% -0.64% -1.64%
AppendFloat/32Integer ~ ~ ~ -0.79% ~ -0.66%
AppendFloat/32ExactFraction -0.50% ~ +5.69% ~ -1.24% +0.69%
AppendFloat/32Point ~ -1.19% +2.59% +1.03% -1.37% +0.80%
AppendFloat/32Exp -3.39% -2.79% -8.36% -0.94% -5.72% -5.92%
AppendFloat/32NegExp -0.63% ~ ~ +0.98% -1.34% -0.73%
AppendFloat/32Shortest -1.00% +1.36% +2.94% ~ ~ ~
AppendFloat/32Fixed8Hard -5.91% -12.45% -6.62% ~ +18.46% +11.61%
AppendFloat/32Fixed9Hard -6.53% -11.35% -6.01% -0.97% -18.31% -9.16%
AppendFloat/64Fixed1 -13.84% -16.90% -13.13% -10.71% -24.52% -18.94%
AppendFloat/64Fixed2 -11.12% -16.97% -12.13% -9.88% -22.73% -15.48%
AppendFloat/64Fixed2.5 -21.98% -20.75% -19.08% -14.74% -28.11% -24.92%
AppendFloat/64Fixed3 -11.53% -16.21% -10.75% -7.53% -23.11% -15.78%
AppendFloat/64Fixed4 -12.89% -12.36% -11.07% -9.79% -14.51% -13.44%
AppendFloat/64Fixed5Hard -47.62% -38.59% -40.83% -37.06% -60.51% -55.29%
AppendFloat/64Fixed12 -7.40% ~ -8.56% -4.31% -13.82% -8.61%
AppendFloat/64Fixed16 -9.10% -8.95% -6.92% -3.92% -12.99% -9.03%
AppendFloat/64Fixed12Hard -9.14% -5.24% -6.23% -4.82% -13.58% -8.99%
AppendFloat/64Fixed17Hard -6.80% ~ -4.03% -2.84% -19.81% -10.27%
AppendFloat/64Fixed18Hard -0.12% ~ ~ ~ ~ ~
AppendFloat/64FixedF1 ~ ~ ~ ~ -0.40% +2.72%
AppendFloat/64FixedF2 -0.18% ~ -1.98% -0.95% ~ +1.25%
AppendFloat/64FixedF3 -0.29% ~ ~ ~ ~ +1.22%
AppendFloat/Slowpath64 -1.16% ~ ~ ~ ~ -2.16%
AppendFloat/SlowpathDenormal64 -1.09% ~ ~ -0.88% -0.83% ~
host: linux-arm64
goos: linux
goarch: arm64
pkg: internal/strconv
cpu: unknown
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-8 60.35n ± 0% 60.24n ± 0% -0.18% (p=0.000 n=20)
AppendFloat/Float-8 88.83n ± 0% 88.91n ± 0% +0.09% (p=0.000 n=20)
AppendFloat/Exp-8 93.55n ± 0% 93.06n ± 0% -0.51% (p=0.000 n=20)
AppendFloat/NegExp-8 94.01n ± 0% 93.06n ± 0% -1.01% (p=0.000 n=20)
AppendFloat/LongExp-8 101.00n ± 0% 99.77n ± 0% -1.22% (p=0.000 n=20)
AppendFloat/Big-8 106.1n ± 0% 103.9n ± 0% -2.07% (p=0.000 n=20)
AppendFloat/BinaryExp-8 47.48n ± 0% 47.35n ± 0% -0.28% (p=0.000 n=20)
AppendFloat/32Integer-8 60.45n ± 0% 60.43n ± 0% ~ (p=0.150 n=20)
AppendFloat/32ExactFraction-8 86.65n ± 0% 86.22n ± 0% -0.50% (p=0.000 n=20)
AppendFloat/32Point-8 83.26n ± 0% 83.21n ± 0% ~ (p=0.046 n=20)
AppendFloat/32Exp-8 92.55n ± 0% 89.42n ± 0% -3.39% (p=0.000 n=20)
AppendFloat/32NegExp-8 87.89n ± 0% 87.34n ± 0% -0.63% (p=0.000 n=20)
AppendFloat/32Shortest-8 77.05n ± 0% 76.28n ± 0% -1.00% (p=0.000 n=20)
AppendFloat/32Fixed8Hard-8 55.73n ± 0% 52.44n ± 0% -5.91% (p=0.000 n=20)
AppendFloat/32Fixed9Hard-8 64.80n ± 0% 60.57n ± 0% -6.53% (p=0.000 n=20)
AppendFloat/64Fixed1-8 53.72n ± 0% 46.29n ± 0% -13.84% (p=0.000 n=20)
AppendFloat/64Fixed2-8 52.64n ± 0% 46.79n ± 0% -11.12% (p=0.000 n=20)
AppendFloat/64Fixed2.5-8 56.01n ± 0% 43.70n ± 0% -21.98% (p=0.000 n=20)
AppendFloat/64Fixed3-8 53.38n ± 0% 47.23n ± 0% -11.53% (p=0.000 n=20)
AppendFloat/64Fixed4-8 50.62n ± 0% 44.10n ± 0% -12.89% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-8 98.94n ± 0% 51.82n ± 0% -47.62% (p=0.000 n=20)
AppendFloat/64Fixed12-8 84.70n ± 0% 78.44n ± 0% -7.40% (p=0.000 n=20)
AppendFloat/64Fixed16-8 71.68n ± 0% 65.16n ± 0% -9.10% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-8 68.41n ± 0% 62.16n ± 0% -9.14% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-8 79.31n ± 0% 73.92n ± 0% -6.80% (p=0.000 n=20)
AppendFloat/64Fixed18Hard-8 4.290µ ± 0% 4.285µ ± 0% -0.12% (p=0.000 n=20)
AppendFloat/64FixedF1-8 216.0n ± 0% 216.1n ± 0% ~ (p=0.090 n=20)
AppendFloat/64FixedF2-8 228.2n ± 0% 227.8n ± 0% -0.18% (p=0.000 n=20)
AppendFloat/64FixedF3-8 208.8n ± 0% 208.2n ± 0% -0.29% (p=0.000 n=20)
AppendFloat/Slowpath64-8 98.56n ± 0% 97.42n ± 0% -1.16% (p=0.000 n=20)
AppendFloat/SlowpathDenormal64-8 95.81n ± 0% 94.77n ± 0% -1.09% (p=0.000 n=20)
geomean 93.81n 87.87n -6.33%
host: local
goos: darwin
cpu: Apple M3 Pro
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-12 21.14n ± 0% 21.15n ± 0% ~ (p=0.963 n=20)
AppendFloat/Float-12 32.48n ± 1% 32.43n ± 0% ~ (p=0.358 n=20)
AppendFloat/Exp-12 31.85n ± 0% 31.94n ± 1% ~ (p=0.634 n=20)
AppendFloat/NegExp-12 31.75n ± 0% 32.04n ± 0% ~ (p=0.004 n=20)
AppendFloat/LongExp-12 33.55n ± 0% 33.81n ± 0% +0.77% (p=0.000 n=20)
AppendFloat/Big-12 35.62n ± 1% 35.73n ± 1% ~ (p=0.888 n=20)
AppendFloat/BinaryExp-12 19.26n ± 0% 19.46n ± 1% +1.06% (p=0.000 n=20)
AppendFloat/32Integer-12 21.41n ± 0% 21.46n ± 1% ~ (p=0.733 n=20)
AppendFloat/32ExactFraction-12 31.23n ± 1% 31.30n ± 1% ~ (p=0.857 n=20)
AppendFloat/32Point-12 31.39n ± 1% 31.02n ± 0% -1.19% (p=0.000 n=20)
AppendFloat/32Exp-12 32.42n ± 1% 31.52n ± 1% -2.79% (p=0.000 n=20)
AppendFloat/32NegExp-12 30.66n ± 1% 30.66n ± 1% ~ (p=0.380 n=20)
AppendFloat/32Shortest-12 26.88n ± 1% 27.25n ± 1% +1.36% (p=0.000 n=20)
AppendFloat/32Fixed8Hard-12 19.52n ± 0% 17.09n ± 1% -12.45% (p=0.000 n=20)
AppendFloat/32Fixed9Hard-12 21.55n ± 2% 19.11n ± 1% -11.35% (p=0.000 n=20)
AppendFloat/64Fixed1-12 18.64n ± 0% 15.49n ± 0% -16.90% (p=0.000 n=20)
AppendFloat/64Fixed2-12 18.65n ± 0% 15.49n ± 0% -16.97% (p=0.000 n=20)
AppendFloat/64Fixed2.5-12 19.23n ± 1% 15.24n ± 0% -20.75% (p=0.000 n=20)
AppendFloat/64Fixed3-12 18.61n ± 0% 15.59n ± 1% -16.21% (p=0.000 n=20)
AppendFloat/64Fixed4-12 17.55n ± 1% 15.38n ± 0% -12.36% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-12 29.27n ± 1% 17.97n ± 0% -38.59% (p=0.000 n=20)
AppendFloat/64Fixed12-12 28.26n ± 1% 28.17n ± 10% ~ (p=0.941 n=20)
AppendFloat/64Fixed16-12 23.56n ± 0% 21.46n ± 0% -8.95% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-12 21.85n ± 2% 20.70n ± 1% -5.24% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-12 26.91n ± 1% 27.10n ± 0% ~ (p=0.059 n=20)
AppendFloat/64Fixed18Hard-12 2.197µ ± 1% 2.169µ ± 1% ~ (p=0.013 n=20)
AppendFloat/64FixedF1-12 103.7n ± 1% 103.3n ± 0% ~ (p=0.035 n=20)
AppendFloat/64FixedF2-12 114.8n ± 1% 114.1n ± 1% ~ (p=0.234 n=20)
AppendFloat/64FixedF3-12 107.8n ± 1% 107.1n ± 1% ~ (p=0.180 n=20)
AppendFloat/Slowpath64-12 32.05n ± 1% 32.00n ± 0% ~ (p=0.952 n=20)
AppendFloat/SlowpathDenormal64-12 29.98n ± 1% 30.20n ± 0% ~ (p=0.004 n=20)
geomean 33.83n 31.91n -5.68%
host: linux-amd64
goos: linux
goarch: amd64
cpu: Intel(R) Xeon(R) CPU @ 2.30GHz
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-16 64.00n ± 1% 63.67n ± 1% ~ (p=0.784 n=20)
AppendFloat/Float-16 95.99n ± 1% 97.42n ± 1% +1.50% (p=0.000 n=20)
AppendFloat/Exp-16 97.59n ± 1% 97.72n ± 1% ~ (p=0.984 n=20)
AppendFloat/NegExp-16 97.80n ± 1% 101.15n ± 1% +3.43% (p=0.000 n=20)
AppendFloat/LongExp-16 103.1n ± 1% 104.5n ± 1% ~ (p=0.006 n=20)
AppendFloat/Big-16 110.8n ± 1% 108.5n ± 1% -2.07% (p=0.000 n=20)
AppendFloat/BinaryExp-16 47.82n ± 1% 47.33n ± 1% ~ (p=0.007 n=20)
AppendFloat/32Integer-16 63.65n ± 1% 63.51n ± 0% ~ (p=0.560 n=20)
AppendFloat/32ExactFraction-16 91.81n ± 1% 97.03n ± 1% +5.69% (p=0.000 n=20)
AppendFloat/32Point-16 89.84n ± 1% 92.16n ± 1% +2.59% (p=0.000 n=20)
AppendFloat/32Exp-16 103.80n ± 1% 95.12n ± 1% -8.36% (p=0.000 n=20)
AppendFloat/32NegExp-16 93.70n ± 1% 94.87n ± 1% ~ (p=0.003 n=20)
AppendFloat/32Shortest-16 83.98n ± 1% 86.45n ± 1% +2.94% (p=0.000 n=20)
AppendFloat/32Fixed8Hard-16 61.91n ± 1% 57.81n ± 1% -6.62% (p=0.000 n=20)
AppendFloat/32Fixed9Hard-16 71.08n ± 0% 66.81n ± 1% -6.01% (p=0.000 n=20)
AppendFloat/64Fixed1-16 59.27n ± 2% 51.49n ± 1% -13.13% (p=0.000 n=20)
AppendFloat/64Fixed2-16 57.89n ± 1% 50.87n ± 1% -12.13% (p=0.000 n=20)
AppendFloat/64Fixed2.5-16 61.04n ± 1% 49.40n ± 1% -19.08% (p=0.000 n=20)
AppendFloat/64Fixed3-16 58.42n ± 1% 52.14n ± 1% -10.75% (p=0.000 n=20)
AppendFloat/64Fixed4-16 56.52n ± 1% 50.27n ± 1% -11.07% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-16 97.79n ± 1% 57.86n ± 1% -40.83% (p=0.000 n=20)
AppendFloat/64Fixed12-16 90.78n ± 1% 83.01n ± 1% -8.56% (p=0.000 n=20)
AppendFloat/64Fixed16-16 76.11n ± 1% 70.84n ± 0% -6.92% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-16 73.56n ± 1% 68.98n ± 2% -6.23% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-16 83.20n ± 1% 79.85n ± 1% -4.03% (p=0.000 n=20)
AppendFloat/64Fixed18Hard-16 4.947µ ± 1% 4.915µ ± 1% ~ (p=0.229 n=20)
AppendFloat/64FixedF1-16 242.4n ± 1% 239.4n ± 1% ~ (p=0.038 n=20)
AppendFloat/64FixedF2-16 257.7n ± 2% 252.6n ± 1% -1.98% (p=0.000 n=20)
AppendFloat/64FixedF3-16 237.5n ± 0% 237.5n ± 1% ~ (p=0.440 n=20)
AppendFloat/Slowpath64-16 99.75n ± 1% 99.78n ± 1% ~ (p=0.995 n=20)
AppendFloat/SlowpathDenormal64-16 97.41n ± 1% 98.20n ± 1% ~ (p=0.006 n=20)
geomean 100.7n 95.60n -5.05%
host: s7
cpu: AMD Ryzen 9 7950X 16-Core Processor
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-32 22.19n ± 0% 22.04n ± 0% -0.68% (p=0.000 n=20)
AppendFloat/Float-32 34.59n ± 0% 34.88n ± 0% +0.84% (p=0.000 n=20)
AppendFloat/Exp-32 34.47n ± 0% 34.88n ± 0% +1.20% (p=0.000 n=20)
AppendFloat/NegExp-32 34.85n ± 0% 35.32n ± 0% +1.35% (p=0.000 n=20)
AppendFloat/LongExp-32 37.23n ± 0% 37.09n ± 0% ~ (p=0.003 n=20)
AppendFloat/Big-32 39.27n ± 0% 38.50n ± 0% -1.97% (p=0.000 n=20)
AppendFloat/BinaryExp-32 17.38n ± 0% 17.61n ± 0% +1.35% (p=0.000 n=20)
AppendFloat/32Integer-32 22.26n ± 0% 22.08n ± 0% -0.79% (p=0.000 n=20)
AppendFloat/32ExactFraction-32 32.82n ± 0% 32.91n ± 0% ~ (p=0.018 n=20)
AppendFloat/32Point-32 32.88n ± 0% 33.22n ± 0% +1.03% (p=0.000 n=20)
AppendFloat/32Exp-32 34.95n ± 0% 34.62n ± 0% -0.94% (p=0.000 n=20)
AppendFloat/32NegExp-32 33.23n ± 0% 33.55n ± 0% +0.98% (p=0.000 n=20)
AppendFloat/32Shortest-32 30.19n ± 0% 30.12n ± 0% ~ (p=0.122 n=20)
AppendFloat/32Fixed8Hard-32 22.94n ± 0% 22.88n ± 0% ~ (p=0.124 n=20)
AppendFloat/32Fixed9Hard-32 26.20n ± 0% 25.94n ± 1% -0.97% (p=0.000 n=20)
AppendFloat/64Fixed1-32 21.10n ± 0% 18.84n ± 0% -10.71% (p=0.000 n=20)
AppendFloat/64Fixed2-32 20.75n ± 0% 18.70n ± 0% -9.88% (p=0.000 n=20)
AppendFloat/64Fixed2.5-32 21.07n ± 0% 17.96n ± 0% -14.74% (p=0.000 n=20)
AppendFloat/64Fixed3-32 21.24n ± 0% 19.64n ± 0% -7.53% (p=0.000 n=20)
AppendFloat/64Fixed4-32 20.63n ± 0% 18.61n ± 0% -9.79% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-32 34.48n ± 0% 21.70n ± 0% -37.06% (p=0.000 n=20)
AppendFloat/64Fixed12-32 32.26n ± 0% 30.87n ± 1% -4.31% (p=0.000 n=20)
AppendFloat/64Fixed16-32 27.95n ± 0% 26.86n ± 0% -3.92% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-32 27.30n ± 0% 25.98n ± 1% -4.82% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-32 30.80n ± 0% 29.93n ± 0% -2.84% (p=0.000 n=20)
AppendFloat/64Fixed18Hard-32 1.833µ ± 0% 1.831µ ± 0% ~ (p=0.663 n=20)
AppendFloat/64FixedF1-32 83.42n ± 1% 84.00n ± 1% ~ (p=0.003 n=20)
AppendFloat/64FixedF2-32 90.10n ± 0% 89.23n ± 1% -0.95% (p=0.001 n=20)
AppendFloat/64FixedF3-32 84.42n ± 1% 84.39n ± 0% ~ (p=0.878 n=20)
AppendFloat/Slowpath64-32 35.72n ± 0% 35.59n ± 0% ~ (p=0.007 n=20)
AppendFloat/SlowpathDenormal64-32 35.36n ± 0% 35.05n ± 0% -0.88% (p=0.000 n=20)
geomean 36.05n 34.69n -3.77%
host: linux-386
goarch: 386
cpu: Intel(R) Xeon(R) CPU @ 2.30GHz
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-16 132.8n ± 0% 133.5n ± 0% +0.49% (p=0.001 n=20)
AppendFloat/Float-16 242.6n ± 0% 241.7n ± 0% -0.37% (p=0.000 n=20)
AppendFloat/Exp-16 252.2n ± 0% 249.1n ± 0% -1.27% (p=0.000 n=20)
AppendFloat/NegExp-16 253.6n ± 0% 247.7n ± 0% -2.33% (p=0.000 n=20)
AppendFloat/LongExp-16 260.9n ± 0% 257.1n ± 0% -1.48% (p=0.000 n=20)
AppendFloat/Big-16 293.7n ± 0% 285.2n ± 0% -2.89% (p=0.000 n=20)
AppendFloat/BinaryExp-16 89.63n ± 1% 89.06n ± 0% -0.64% (p=0.000 n=20)
AppendFloat/32Integer-16 132.6n ± 0% 133.2n ± 0% ~ (p=0.016 n=20)
AppendFloat/32ExactFraction-16 216.9n ± 0% 214.2n ± 0% -1.24% (p=0.000 n=20)
AppendFloat/32Point-16 205.0n ± 0% 202.2n ± 0% -1.37% (p=0.000 n=20)
AppendFloat/32Exp-16 250.2n ± 0% 235.9n ± 0% -5.72% (p=0.000 n=20)
AppendFloat/32NegExp-16 213.5n ± 0% 210.6n ± 0% -1.34% (p=0.000 n=20)
AppendFloat/32Shortest-16 198.3n ± 0% 197.8n ± 0% ~ (p=0.147 n=20)
AppendFloat/32Fixed8Hard-16 114.9n ± 1% 136.0n ± 1% +18.46% (p=0.000 n=20)
AppendFloat/32Fixed9Hard-16 189.8n ± 0% 155.0n ± 1% -18.31% (p=0.000 n=20)
AppendFloat/64Fixed1-16 175.8n ± 0% 132.7n ± 0% -24.52% (p=0.000 n=20)
AppendFloat/64Fixed2-16 166.6n ± 0% 128.7n ± 0% -22.73% (p=0.000 n=20)
AppendFloat/64Fixed2.5-16 176.5n ± 0% 126.8n ± 0% -28.11% (p=0.000 n=20)
AppendFloat/64Fixed3-16 165.3n ± 0% 127.1n ± 0% -23.11% (p=0.000 n=20)
AppendFloat/64Fixed4-16 141.3n ± 0% 120.8n ± 1% -14.51% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-16 344.6n ± 0% 136.0n ± 0% -60.51% (p=0.000 n=20)
AppendFloat/64Fixed12-16 184.2n ± 0% 158.7n ± 0% -13.82% (p=0.000 n=20)
AppendFloat/64Fixed16-16 174.0n ± 0% 151.3n ± 0% -12.99% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-16 169.7n ± 0% 146.7n ± 0% -13.58% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-16 207.7n ± 0% 166.6n ± 0% -19.81% (p=0.000 n=20)
AppendFloat/64Fixed18Hard-16 10.66µ ± 0% 10.63µ ± 0% ~ (p=0.030 n=20)
AppendFloat/64FixedF1-16 615.9n ± 0% 613.5n ± 0% -0.40% (p=0.000 n=20)
AppendFloat/64FixedF2-16 846.6n ± 0% 847.4n ± 0% ~ (p=0.551 n=20)
AppendFloat/64FixedF3-16 609.9n ± 0% 609.5n ± 0% ~ (p=0.213 n=20)
AppendFloat/Slowpath64-16 254.1n ± 0% 252.6n ± 1% ~ (p=0.048 n=20)
AppendFloat/SlowpathDenormal64-16 251.5n ± 0% 249.4n ± 0% -0.83% (p=0.000 n=20)
geomean 249.2n 225.4n -9.54%
host: s7:GOARCH=386
cpu: AMD Ryzen 9 7950X 16-Core Processor
│
14b7e09f493 │
f9bf7fcb8e2 │
│ sec/op │ sec/op vs base │
AppendFloat/Decimal-32 42.65n ± 0% 42.31n ± 0% -0.79% (p=0.000 n=20)
AppendFloat/Float-32 71.56n ± 0% 71.06n ± 0% -0.69% (p=0.000 n=20)
AppendFloat/Exp-32 75.61n ± 1% 74.85n ± 1% -1.01% (p=0.000 n=20)
AppendFloat/NegExp-32 74.36n ± 0% 74.30n ± 0% ~ (p=0.482 n=20)
AppendFloat/LongExp-32 75.82n ± 0% 75.73n ± 0% ~ (p=0.490 n=20)
AppendFloat/Big-32 85.10n ± 0% 82.61n ± 0% -2.93% (p=0.000 n=20)
AppendFloat/BinaryExp-32 33.02n ± 0% 32.48n ± 1% -1.64% (p=0.000 n=20)
AppendFloat/32Integer-32 41.54n ± 1% 41.27n ± 1% -0.66% (p=0.000 n=20)
AppendFloat/32ExactFraction-32 62.48n ± 0% 62.91n ± 0% +0.69% (p=0.000 n=20)
AppendFloat/32Point-32 60.17n ± 0% 60.65n ± 0% +0.80% (p=0.000 n=20)
AppendFloat/32Exp-32 73.34n ± 0% 68.99n ± 0% -5.92% (p=0.000 n=20)
AppendFloat/32NegExp-32 63.29n ± 0% 62.83n ± 0% -0.73% (p=0.000 n=20)
AppendFloat/32Shortest-32 58.97n ± 0% 59.07n ± 0% ~ (p=0.029 n=20)
AppendFloat/32Fixed8Hard-32 37.42n ± 0% 41.76n ± 1% +11.61% (p=0.000 n=20)
AppendFloat/32Fixed9Hard-32 55.18n ± 0% 50.13n ± 1% -9.16% (p=0.000 n=20)
AppendFloat/64Fixed1-32 50.89n ± 1% 41.25n ± 0% -18.94% (p=0.000 n=20)
AppendFloat/64Fixed2-32 48.33n ± 1% 40.85n ± 1% -15.48% (p=0.000 n=20)
AppendFloat/64Fixed2.5-32 52.46n ± 0% 39.39n ± 0% -24.92% (p=0.000 n=20)
AppendFloat/64Fixed3-32 48.28n ± 1% 40.66n ± 0% -15.78% (p=0.000 n=20)
AppendFloat/64Fixed4-32 44.57n ± 0% 38.58n ± 0% -13.44% (p=0.000 n=20)
AppendFloat/64Fixed5Hard-32 96.16n ± 0% 42.99n ± 1% -55.29% (p=0.000 n=20)
AppendFloat/64Fixed12-32 56.84n ± 0% 51.95n ± 1% -8.61% (p=0.000 n=20)
AppendFloat/64Fixed16-32 54.23n ± 0% 49.33n ± 0% -9.03% (p=0.000 n=20)
AppendFloat/64Fixed12Hard-32 53.47n ± 0% 48.67n ± 0% -8.99% (p=0.000 n=20)
AppendFloat/64Fixed17Hard-32 61.76n ± 0% 55.42n ± 1% -10.27% (p=0.000 n=20)
AppendFloat/64Fixed18Hard-32 3.998µ ± 1% 4.001µ ± 0% ~ (p=0.449 n=20)
AppendFloat/64FixedF1-32 161.8n ± 0% 166.2n ± 1% +2.72% (p=0.000 n=20)
AppendFloat/64FixedF2-32 223.4n ± 2% 226.2n ± 1% +1.25% (p=0.000 n=20)
AppendFloat/64FixedF3-32 159.6n ± 0% 161.6n ± 1% +1.22% (p=0.000 n=20)
AppendFloat/Slowpath64-32 76.69n ± 0% 75.03n ± 0% -2.16% (p=0.000 n=20)
AppendFloat/SlowpathDenormal64-32 75.02n ± 0% 74.36n ± 1% ~ (p=0.003 n=20)
geomean 74.66n 69.39n -7.06%
Change-Id: I9db46471a93bd2aab3c2796e563d154cb531d4cb
Reviewed-on: https://go-review.googlesource.com/c/go/+/717182
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Russ Cox <rsc@golang.org>