Yasuhiro Matsumoto
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4012fea822
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all: fix typos
Change-Id: I83180c472db8795803c1b9be3a33f35959e4dcc2
Reviewed-on: https://go-review.googlesource.com/c/go/+/336889
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
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2021-08-17 13:54:10 +00:00 |
Rémy Oudompheng
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074a49bfe8
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strconv: remove unused extfloat (Grisu3) ftoa code
Change-Id: Ie8995362f9e8072b173d08820330d2d1e512aa71
Reviewed-on: https://go-review.googlesource.com/c/go/+/314029
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
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2021-04-27 17:03:53 +00:00 |
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Rémy Oudompheng
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61a08fc6ce
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strconv: Implement Ryū algorithm for ftoa shortest mode
This patch implements the algorithm from Ulf Adams,
"Ryū: Fast Float-to-String Conversion" (doi:10.1145/3192366.3192369)
for formatting floating-point numbers with a fixed number of decimal
digits.
It is not a direct translation of the reference C implementation
but still follows the original paper. In particular, it uses full
128-bit powers of 10, which allows for more precision in the other
modes (fixed ftoa, atof).
name old time/op new time/op delta
AppendFloat/Decimal-4 49.6ns ± 3% 59.3ns ± 0% +19.59% (p=0.008 n=5+5)
AppendFloat/Float-4 122ns ± 1% 91ns ± 1% -25.92% (p=0.008 n=5+5)
AppendFloat/Exp-4 89.3ns ± 1% 100.0ns ± 1% +11.98% (p=0.008 n=5+5)
AppendFloat/NegExp-4 88.3ns ± 2% 97.1ns ± 1% +9.87% (p=0.008 n=5+5)
AppendFloat/LongExp-4 143ns ± 2% 103ns ± 0% -28.17% (p=0.016 n=5+4)
AppendFloat/Big-4 144ns ± 1% 110ns ± 1% -23.26% (p=0.008 n=5+5)
AppendFloat/BinaryExp-4 46.2ns ± 2% 46.0ns ± 1% ~ (p=0.603 n=5+5)
AppendFloat/32Integer-4 49.1ns ± 1% 58.7ns ± 1% +19.57% (p=0.008 n=5+5)
AppendFloat/32ExactFraction-4 95.6ns ± 1% 88.6ns ± 1% -7.30% (p=0.008 n=5+5)
AppendFloat/32Point-4 122ns ± 1% 87ns ± 1% -28.63% (p=0.008 n=5+5)
AppendFloat/32Exp-4 88.6ns ± 2% 95.0ns ± 1% +7.29% (p=0.008 n=5+5)
AppendFloat/32NegExp-4 87.2ns ± 1% 91.3ns ± 1% +4.63% (p=0.008 n=5+5)
AppendFloat/32Shortest-4 107ns ± 1% 82ns ± 0% -24.08% (p=0.008 n=5+5)
AppendFloat/Slowpath64-4 1.00µs ± 1% 0.10µs ± 0% -89.92% (p=0.016 n=5+4)
AppendFloat/SlowpathDenormal64-4 34.1µs ± 3% 0.1µs ± 1% -99.72% (p=0.008 n=5+5)
Fixes #15672
Change-Id: Ib90dfa245f62490a6666671896013cf3f9a1fb22
Reviewed-on: https://go-review.googlesource.com/c/go/+/170080
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Nigel Tao <nigeltao@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
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2021-04-15 09:18:03 +00:00 |
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Rémy Oudompheng
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0184b445c0
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strconv: implement Ryū-like algorithm for fixed precision ftoa
This patch implements a simplified version of Ulf Adams,
"Ryū: Fast Float-to-String Conversion" (doi:10.1145/3192366.3192369)
for formatting floating-point numbers with a fixed number of decimal
digits.
It uses the same principles but does not need to handle
the complex task of finding a shortest representation.
This allows to handle a few more cases than Grisu3, notably
formatting with up to 18 significant digits.
name old time/op new time/op delta
AppendFloat/32Fixed8Hard-4 72.0ns ± 2% 56.0ns ± 2% -22.28% (p=0.000 n=10+10)
AppendFloat/32Fixed9Hard-4 74.8ns ± 0% 64.2ns ± 2% -14.16% (p=0.000 n=8+10)
AppendFloat/64Fixed1-4 60.4ns ± 1% 54.2ns ± 1% -10.31% (p=0.000 n=10+9)
AppendFloat/64Fixed2-4 66.3ns ± 1% 53.3ns ± 1% -19.54% (p=0.000 n=10+9)
AppendFloat/64Fixed3-4 61.0ns ± 1% 55.0ns ± 2% -9.80% (p=0.000 n=9+10)
AppendFloat/64Fixed4-4 66.9ns ± 0% 52.0ns ± 2% -22.20% (p=0.000 n=8+10)
AppendFloat/64Fixed12-4 95.5ns ± 1% 76.2ns ± 3% -20.19% (p=0.000 n=10+9)
AppendFloat/64Fixed16-4 1.62µs ± 0% 0.07µs ± 2% -95.69% (p=0.000 n=10+10)
AppendFloat/64Fixed12Hard-4 1.27µs ± 1% 0.07µs ± 1% -94.83% (p=0.000 n=9+9)
AppendFloat/64Fixed17Hard-4 3.68µs ± 1% 0.08µs ± 2% -97.86% (p=0.000 n=10+9)
AppendFloat/64Fixed18Hard-4 3.67µs ± 0% 3.72µs ± 1% +1.44% (p=0.000 n=9+10)
Updates #15672
Change-Id: I160963e141dd48287ad8cf57bcc3c686277788e8
Reviewed-on: https://go-review.googlesource.com/c/go/+/170079
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Nigel Tao <nigeltao@golang.org>
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
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2021-04-15 08:44:21 +00:00 |