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fix: Adjust field alignment #12

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merged 1 commit into from
Oct 22, 2024
Merged

fix: Adjust field alignment #12

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48 changes: 28 additions & 20 deletions decimal.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,15 +13,17 @@ import (
// currently support 12 precision, this is tunnable,
// more precision => smaller maxInt
// less precision => bigger maxInt
const precision = 12
const scale = 1e12
const maxInt int64 = int64(math.MaxInt64) / scale
const minInt int64 = int64(math.MinInt64) / scale
const maxIntInFixed int64 = maxInt * scale
const minIntInFixed int64 = minInt * scale
const a1000InFixed int64 = 1000 * scale
const aNeg1000InFixed int64 = -1000 * scale
const aCentInFixed int64 = scale / 100
const (
precision = 12
scale = 1e12
maxInt int64 = int64(math.MaxInt64) / scale
minInt int64 = int64(math.MinInt64) / scale
maxIntInFixed int64 = maxInt * scale
minIntInFixed int64 = minInt * scale
a1000InFixed int64 = 1000 * scale
aNeg1000InFixed int64 = -1000 * scale
aCentInFixed int64 = scale / 100
)

var pow10Table []int64 = []int64{
1e0, 1e1, 1e2, 1e3, 1e4,
Expand All @@ -38,11 +40,15 @@ var pow10Table []int64 = []int64{
// `valueCache[200000] = "1000"`
//
// this consumes about 9 MB in memory with pprof check.
const cacheSize = 200001
const cacheOffset = 100000
const (
cacheSize = 200001
cacheOffset = 100000
)

var valueCache [cacheSize]driver.Value
var stringCache [cacheSize]string
var (
valueCache [cacheSize]driver.Value
stringCache [cacheSize]string
)

func init() {
// init cache
Expand All @@ -62,10 +68,12 @@ func init() {
// mostly due to lack of usage in Alpaca. we should be able to move "fallback" to "optimized" as needed.

// Variables
var DivisionPrecision = decimal.DivisionPrecision
var ExpMaxIterations = decimal.ExpMaxIterations
var MarshalJSONWithoutQuotes = decimal.MarshalJSONWithoutQuotes
var Zero = Decimal{fixed: 0}
var (
DivisionPrecision = decimal.DivisionPrecision
ExpMaxIterations = decimal.ExpMaxIterations
MarshalJSONWithoutQuotes = decimal.MarshalJSONWithoutQuotes
Zero = Decimal{fixed: 0}
)

func RescalePair(d1 Decimal, d2 Decimal) (Decimal, Decimal) {
if d1.fallback == nil && d2.fallback == nil {
Expand All @@ -76,13 +84,13 @@ func RescalePair(d1 Decimal, d2 Decimal) (Decimal, Decimal) {
}

type Decimal struct {
// fallback to original decimal.Decimal if necessary
fallback *decimal.Decimal

// represent decimal with 12 precision, 1.23 will have `fixed = 1_230_000_000_000`
// max support decimal is 9_223_372.000_000_000_000
// min support decimal is -9_223_372.000_000_000_000
fixed int64

// fallback to original decimal.Decimal if necessary
fallback *decimal.Decimal
}

// optimized:
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