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1ff59f3dd3
Both Eisel-Lemire and Ryu depend on a table of truncated 128-bit mantissas of powers of 10, and so will Dragonbox. This CL: - Moves the table to a separate file, so it doesn't look tied to Eisel-Lemire. - Introduces a uint128 type in math.go for the table values, since .Hi and .Lo are clearer than [1] and [0]. - Generates the table from a standalone generator pow10gen.go. - Adds a new pow10 function in math.go to handle table access details. - Factors a 64x128->192-bit multiply into umul192 in math.go. - Moves multiplication by log₁₀ 2 and log₂ 10 into math.go. - Introduces an import_test.go to avoid having to type differently cased names in test code versus regular code. - Introduces named constants for the floating-point size parameters. Previously these were only in the floatInfo global variables. - Changes the BenchmarkAppendUintVarlen subtest names to be more useful. Change-Id: I9826ee5f41c5c19be3b6a7c3c5f277ec6c23b39a Reviewed-on: https://go-review.googlesource.com/c/go/+/712661 Reviewed-by: Alan Donovan <adonovan@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
30 lines
613 B
Go
30 lines
613 B
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strconv
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type Uint128 = uint128
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var (
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BaseError = baseError
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BitSizeError = bitSizeError
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MulLog10_2 = mulLog10_2
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MulLog2_10 = mulLog2_10
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ParseFloatPrefix = parseFloatPrefix
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Pow10 = pow10
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Umul128 = umul128
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Umul192 = umul192
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)
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func NewDecimal(i uint64) *decimal {
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d := new(decimal)
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d.Assign(i)
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return d
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}
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func SetOptimize(b bool) bool {
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old := optimize
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optimize = b
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return old
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}
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