osmomath: mutative and efficient BigDec truncations with arbitrary decimals

CHANGELOG.md

@@ -46,6 +46,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * [#6427](https://github.com/osmosis-labs/osmosis/pull/6427) sdk.Coins Mul and Quo helpers in osmoutils
 * [#6437](https://github.com/osmosis-labs/osmosis/pull/6437) mutative version for QuoRoundUp
+* [#6261](https://github.com/osmosis-labs/osmosis/pull/6261) mutative and efficient BigDec truncations with arbitrary decimals
 
 ### Misc Improvements
 

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/mattn/go-sqlite3 v1.14.17
 	github.com/ory/dockertest/v3 v3.10.0
 	github.com/osmosis-labs/go-mutesting v0.0.0-20221208041716-b43bcd97b3b3
-	github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920134650-28712c635b4f
+	github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920190757-3f566b965c22
 	github.com/osmosis-labs/osmosis/osmoutils v0.0.7-0.20230911120014-b14342e08daf
 	github.com/osmosis-labs/osmosis/x/epochs v0.0.3-0.20230911120014-b14342e08daf
 	github.com/osmosis-labs/osmosis/x/ibc-hooks v0.0.9-0.20230911120014-b14342e08daf
@@ -57,15 +57,15 @@ require (
 	github.com/benbjohnson/clock v1.3.0 // indirect
 	github.com/butuzov/mirror v1.1.0 // indirect
 	github.com/ccojocar/zxcvbn-go v1.0.1 // indirect
-	github.com/chenzhuoyu/iasm v0.9.0 // indirect
+	github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d // indirect
 	github.com/cosmos/gogoproto v1.4.11 // indirect
 	github.com/cosmos/iavl v0.19.5 // indirect
 	github.com/creachadair/taskgroup v0.3.2 // indirect
 	github.com/curioswitch/go-reassign v0.2.0 // indirect
 	github.com/docker/distribution v2.8.2+incompatible // indirect
 	github.com/felixge/httpsnoop v1.0.2 // indirect
-	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/gogo/gateway v1.1.0 // indirect
 	github.com/google/btree v1.1.2 // indirect
 	github.com/kkHAIKE/contextcheck v1.1.4 // indirect
@@ -79,7 +79,6 @@ require (
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
 	github.com/timonwong/loggercheck v0.9.4 // indirect
-	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/xen0n/gosmopolitan v1.2.1 // indirect
 	github.com/ykadowak/zerologlint v0.1.3 // indirect
 	github.com/zimmski/go-mutesting v0.0.0-20210610104036-6d9217011a00 // indirect
@@ -88,6 +87,7 @@ require (
 	go.uber.org/atomic v1.10.0 // indirect
 	go.uber.org/goleak v1.1.12 // indirect
 	go.uber.org/zap v1.24.0 // indirect
+	golang.org/x/arch v0.5.0 // indirect
 	google.golang.org/genproto v0.0.0-20230803162519-f966b187b2e5 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230815205213-6bfd019c3878 // indirect
 )

go.sum

@@ -197,6 +197,8 @@ github.com/butuzov/ireturn v0.2.0/go.mod h1:Wh6Zl3IMtTpaIKbmwzqi6olnM9ptYQxxVacM
 github.com/butuzov/mirror v1.1.0 h1:ZqX54gBVMXu78QLoiqdwpl2mgmoOJTk7s4p4o+0avZI=
 github.com/butuzov/mirror v1.1.0/go.mod h1:8Q0BdQU6rC6WILDiBM60DBfvV78OLJmMmixe7GF45AE=
 github.com/bwesterb/go-ristretto v1.2.0/go.mod h1:fUIoIZaG73pV5biE2Blr2xEzDoMj7NFEuV9ekS419A0=
+github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
+github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
 github.com/bytedance/sonic v1.10.0 h1:qtNZduETEIWJVIyDl01BeNxur2rW9OwTQ/yBqFRkKEk=
 github.com/c-bata/go-prompt v0.2.2/go.mod h1:VzqtzE2ksDBcdln8G7mk2RX9QyGjH+OVqOCSiVIqS34=
 github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
@@ -220,7 +222,10 @@ github.com/charithe/durationcheck v0.0.10/go.mod h1:bCWXb7gYRysD1CU3C+u4ceO49LoG
 github.com/chavacava/garif v0.0.0-20230227094218-b8c73b2037b8 h1:W9o46d2kbNL06lq7UNDPV0zYLzkrde/bjIqO02eoll0=
 github.com/chavacava/garif v0.0.0-20230227094218-b8c73b2037b8/go.mod h1:gakxgyXaaPkxvLw1XQxNGK4I37ys9iBRzNUx/B7pUCo=
 github.com/checkpoint-restore/go-criu/v5 v5.3.0/go.mod h1:E/eQpaFtUKGOOSEBZgmKAcn+zUUwWxqcaKZlF54wK8E=
+github.com/chenzhuoyu/base64x v0.0.0-20211019084208-fb5309c8db06/go.mod h1:DH46F32mSOjUmXrMHnKwZdA8wcEefY7UVqBKYGjpdQY=
+github.com/chenzhuoyu/base64x v0.0.0-20221115062448-fe3a3abad311/go.mod h1:b583jCggY9gE99b6G5LEC39OIiVsWj+R97kbl5odCEk=
 github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d h1:77cEq6EriyTZ0g/qfRdp61a3Uu/AWrgIq2s0ClJV1g0=
+github.com/chenzhuoyu/base64x v0.0.0-20230717121745-296ad89f973d/go.mod h1:8EPpVsBuRksnlj1mLy4AWzRNQYxauNi62uWcE3to6eA=
 github.com/chenzhuoyu/iasm v0.9.0 h1:9fhXjVzq5hUy2gkhhgHl95zG2cEAhw9OSGs8toWWAwo=
 github.com/chenzhuoyu/iasm v0.9.0/go.mod h1:Xjy2NpN3h7aUqeqM+woSuuvxmIe6+DDsiNLIrkAmYog=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
@@ -383,8 +388,6 @@ github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4
 github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
 github.com/fzipp/gocyclo v0.6.0 h1:lsblElZG7d3ALtGMx9fmxeTKZaLLpU8mET09yN4BBLo=
 github.com/fzipp/gocyclo v0.6.0/go.mod h1:rXPyn8fnlpa0R2csP/31uerbiVBugk5whMdlyaLkLoA=
-github.com/gabriel-vasile/mimetype v1.4.2 h1:w5qFW6JKBz9Y393Y4q372O9A7cUSequkh1Q7OhCmWKU=
-github.com/gabriel-vasile/mimetype v1.4.2/go.mod h1:zApsH/mKG4w07erKIaJPFiX0Tsq9BFQgN3qGY5GnNgA=
 github.com/gballet/go-libpcsclite v0.0.0-20190607065134-2772fd86a8ff/go.mod h1:x7DCsMOv1taUwEWCzT4cmDeAkigA5/QCwUodaVOe8Ww=
 github.com/getkin/kin-openapi v0.53.0/go.mod h1:7Yn5whZr5kJi6t+kShccXS8ae1APpYTW6yheSwk8Yi4=
 github.com/getkin/kin-openapi v0.61.0/go.mod h1:7Yn5whZr5kJi6t+kShccXS8ae1APpYTW6yheSwk8Yi4=
@@ -425,7 +428,7 @@ github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/Nu
 github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
 github.com/go-playground/validator/v10 v10.2.0/go.mod h1:uOYAAleCW8F/7oMFd6aG0GOhaH6EGOAJShg8Id5JGkI=
-github.com/go-playground/validator/v10 v10.14.0 h1:vgvQWe3XCz3gIeFDm/HnTIbj6UGmg/+t63MyGU2n5js=
+github.com/go-playground/validator/v10 v10.11.1 h1:prmOlTVv+YjZjmRmNSF3VmspqJIxJWXmqUsHwfTRRkQ=
 github.com/go-sourcemap/sourcemap v2.1.3+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
 github.com/go-sql-driver/mysql v1.4.0/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
@@ -460,6 +463,7 @@ github.com/gobwas/pool v0.2.0/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6Wezm
 github.com/gobwas/ws v1.0.2 h1:CoAavW/wd/kulfZmSIBt6p24n4j7tHgNVCjsfHVNUbo=
 github.com/gobwas/ws v1.0.2/go.mod h1:szmBTxLgaFppYjEmNtny/v3w89xOydFnnZMcgRRu/EM=
 github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/godbus/dbus v0.0.0-20190726142602-4481cbc300e2 h1:ZpnhV/YsD2/4cESfV5+Hoeu/iUR3ruzNvZ+yQfO03a0=
 github.com/godbus/dbus v0.0.0-20190726142602-4481cbc300e2/go.mod h1:bBOAhwG1umN6/6ZUMtDFBMQR8jRg9O75tm9K00oMsK4=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
@@ -650,8 +654,8 @@ github.com/hashicorp/go-rootcerts v1.0.0/go.mod h1:K6zTfqpRlCUIjkwsN4Z+hiSfzSTQa
 github.com/hashicorp/go-sockaddr v1.0.0/go.mod h1:7Xibr9yA9JjQq1JpNB2Vw7kxv8xerXegt+ozgdvDeDU=
 github.com/hashicorp/go-syslog v1.0.0/go.mod h1:qPfqrKkXGihmCqbJM2mZgkZGvKG1dFdvsLplgctolz4=
 github.com/hashicorp/go-uuid v1.0.0/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
-github.com/hashicorp/go-uuid v1.0.1 h1:fv1ep09latC32wFoVwnqcnKJGnMSdBanPczbHAYm1BE=
 github.com/hashicorp/go-uuid v1.0.1/go.mod h1:6SBZvOh/SIDV7/2o3Jml5SYk/TvGqwFJ/bN7x4byOro=
+github.com/hashicorp/go-uuid v1.0.2 h1:cfejS+Tpcp13yd5nYHWDI6qVCny6wyX2Mt5SGur2IGE=
 github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/go-version v1.2.1/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/go-version v1.6.0 h1:feTTfFNnjP967rlCxM/I9g701jU+RN74YKx2mOkIeek=
@@ -924,8 +928,8 @@ github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+W
 github.com/onsi/ginkgo v1.7.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.10.2/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
-github.com/onsi/ginkgo v1.14.0 h1:2mOpI4JVVPBN+WQRa0WKH2eXR+Ey+uK4n7Zj0aYpIQA=
 github.com/onsi/ginkgo v1.14.0/go.mod h1:iSB4RoI2tjJc9BBv4NKIKWKya62Rps+oPG/Lv9klQyY=
+github.com/onsi/ginkgo v1.16.4 h1:29JGrr5oVBm5ulCWet69zQkzWipVXIol6ygQUe/EzNc=
 github.com/onsi/ginkgo/v2 v2.11.0 h1:WgqUCUt/lT6yXoQ8Wef0fsNn5cAuMK7+KT9UFRz2tcU=
 github.com/onsi/gomega v1.4.1/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
@@ -963,6 +967,8 @@ github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920134402-0622c30178eb h1
 github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920134402-0622c30178eb/go.mod h1:pIItelRYvonB+H8A6KqucOi7xFnJxzDHaWJqOdFNLI4=
 github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920134650-28712c635b4f h1:SwZwcklK2EHIQLD8gVTqMsUTD1GpTyF6X8HlMywrxTc=
 github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920134650-28712c635b4f/go.mod h1:pIItelRYvonB+H8A6KqucOi7xFnJxzDHaWJqOdFNLI4=
+github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920190757-3f566b965c22 h1:D2Qx9OPINxTQVaXQZwklajC04XUYGvY5g+8Z8rMMXas=
+github.com/osmosis-labs/osmosis/osmomath v0.0.7-0.20230920190757-3f566b965c22/go.mod h1:pIItelRYvonB+H8A6KqucOi7xFnJxzDHaWJqOdFNLI4=
 github.com/osmosis-labs/osmosis/osmoutils v0.0.7-0.20230911120014-b14342e08daf h1:r5R/L3tzH+vGPahAdvnVB2Vo0KPhZR0oMNyX4+G2FEo=
 github.com/osmosis-labs/osmosis/osmoutils v0.0.7-0.20230911120014-b14342e08daf/go.mod h1:7VoXHwrSSx8Sii0UFc9YIixF6C/9XfV1pdU2Dliu4WA=
 github.com/osmosis-labs/osmosis/x/epochs v0.0.3-0.20230911120014-b14342e08daf h1:8lkIsAj3L7zxvOZbqVLNJRpSdDxaYhYfAIG7XjPaJiU=
@@ -1239,7 +1245,7 @@ github.com/ugorji/go v1.1.7 h1:/68gy2h+1mWMrwZFeD1kQialdSzAb432dtpeJ42ovdo=
 github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
 github.com/ugorji/go/codec v0.0.0-20181204163529-d75b2dcb6bc8/go.mod h1:VFNgLljTbGfSG7qAOspJ7OScBnGdDN/yBr0sguwnwf0=
 github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
-github.com/ugorji/go/codec v1.2.11 h1:BMaWp1Bb6fHwEtbplGBGJ498wD+LKlNSl25MjdZY4dU=
+github.com/ugorji/go/codec v1.2.7 h1:YPXUKf7fYbp/y8xloBqZOw2qaVggbfwMlI8WM3wZUJ0=
 github.com/ultraware/funlen v0.1.0 h1:BuqclbkY6pO+cvxoq7OsktIXZpgBSkYTQtmwhAK81vI=
 github.com/ultraware/funlen v0.1.0/go.mod h1:XJqmOQja6DpxarLj6Jj1U7JuoS8PvL4nEqDaQhy22p4=
 github.com/ultraware/whitespace v0.0.5 h1:hh+/cpIcopyMYbZNVov9iSxvJU3OYQg78Sfaqzi/CzI=
@@ -1329,7 +1335,9 @@ go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.13.0/go.mod h1:zwrFLgMcdUuIBviXEYEH1YKNaOBnKXsx2IPda5bBwHM=
 go.uber.org/zap v1.24.0 h1:FiJd5l1UOLj0wCgbSE0rwwXHzEdAZS6hiiSnxJN/D60=
 go.uber.org/zap v1.24.0/go.mod h1:2kMP+WWQ8aoFoedH3T2sq6iJ2yDWpHbP0f6MQbS9Gkg=
-golang.org/x/arch v0.3.0 h1:02VY4/ZcO/gBOH6PUaoiptASxtXU10jazRCP865E97k=
+golang.org/x/arch v0.0.0-20210923205945-b76863e36670/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
+golang.org/x/arch v0.5.0 h1:jpGode6huXQxcskEIpOCvrU+tzo81b6+oFLUYXWtH/Y=
+golang.org/x/arch v0.5.0/go.mod h1:5om86z9Hs0C8fWVUuoMHwpExlXzs5Tkyp9hOrfG7pp8=
 golang.org/x/crypto v0.0.0-20170930174604-9419663f5a44/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=

osmomath/decimal.go

@@ -55,6 +55,9 @@ var (
 	// initialized in init() since requires
 	// precision to be defined.
 	twoBigDec BigDec = MustNewBigDecFromStr("2")
+
+	// precisionFactors are used to adjust the scale of big.Int values to match the desired precision
+	precisionFactors = make(map[int64]*big.Int)
 )
 
 // Decimal errors
@@ -70,6 +73,11 @@ func init() {
 	for i := 0; i <= PrecisionBigDec; i++ {
 		precisionMultipliers[i] = calcPrecisionMultiplier(int64(i))
 	}
+
+	for precision := int64(0); precision <= PrecisionBigDec; precision++ {
+		precisionFactor := new(big.Int).Exp(big.NewInt(10), big.NewInt(PrecisionBigDec-precision), nil)
+		precisionFactors[precision] = precisionFactor
+	}
 }
 
 func precisionInt() *big.Int {
@@ -104,35 +112,35 @@ func NewBigDec(i int64) BigDec {
 }
 
 // create a new BigDec from integer with decimal place at prec
-// CONTRACT: prec <= Precision
+// CONTRACT: prec <= PrecisionBigDec
 func NewBigDecWithPrec(i, prec int64) BigDec {
 	return BigDec{
 		new(big.Int).Mul(big.NewInt(i), precisionMultiplier(prec)),
 	}
 }
 
 // create a new BigDec from big integer assuming whole numbers
-// CONTRACT: prec <= Precision
+// CONTRACT: prec <= PrecisionBigDec
 func NewBigDecFromBigInt(i *big.Int) BigDec {
 	return NewBigDecFromBigIntWithPrec(i, 0)
 }
 
 // create a new BigDec from big integer assuming whole numbers
-// CONTRACT: prec <= Precision
+// CONTRACT: prec <= PrecisionBigDec
 func NewBigDecFromBigIntWithPrec(i *big.Int, prec int64) BigDec {
 	return BigDec{
 		new(big.Int).Mul(i, precisionMultiplier(prec)),
 	}
 }
 
 // create a new BigDec from big integer assuming whole numbers
-// CONTRACT: prec <= Precision
+// CONTRACT: prec <= PrecisionBigDec
 func NewBigDecFromInt(i BigInt) BigDec {
 	return NewBigDecFromIntWithPrec(i, 0)
 }
 
 // create a new BigDec from big integer with decimal place at prec
-// CONTRACT: prec <= Precision
+// CONTRACT: prec <= PrecisionBigDec
 func NewBigDecFromIntWithPrec(i BigInt, prec int64) BigDec {
 	return BigDec{
 		new(big.Int).Mul(i.BigInt(), precisionMultiplier(prec)),
@@ -567,23 +575,56 @@ func (d BigDec) MustFloat64() float64 {
 // Dec returns the osmomath.Dec representation of a BigDec.
 // Values in any additional decimal places are truncated.
 func (d BigDec) Dec() Dec {
-	precisionDiff := PrecisionBigDec - PrecisionDec
-	precisionFactor := new(big.Int).Exp(big.NewInt(10), big.NewInt(int64(precisionDiff)), nil)
-
-	if precisionDiff < 0 {
-		panic("invalid decimal precision")
+	return d.DecWithPrecision(PrecisionDec)
+}
+
+// DecWithPrecision converts BigDec to Dec with desired precision
+// Example:
+// BigDec: 1.010100000000153000000000000000000000
+// precision: 4
+// Output Dec: 1.010100000000000000
+// Panics if precision exceeds PrecisionDec
+func (d BigDec) DecWithPrecision(precision int64) Dec {
+	var precisionFactor *big.Int
+	if precision > PrecisionDec {
+		panic(fmt.Sprintf("maximum Dec precision is (%v), provided (%v)", PrecisionDec, precision))
+	} else {
+		precisionFactor = precisionFactors[precision]
 	}
 
 	// Truncate any additional decimal values that exist due to BigDec's additional precision
 	// This relies on big.Int's Quo function doing floor division
 	intRepresentation := new(big.Int).Quo(d.BigInt(), precisionFactor)
 
 	// convert int representation back to SDK Dec precision
-	truncatedDec := NewDecFromBigIntWithPrec(intRepresentation, PrecisionDec)
+	truncatedDec := NewDecFromBigIntWithPrec(intRepresentation, precision)
 
 	return truncatedDec
 }
 
+// ChopPrecisionMut truncates all decimals after precision numbers after decimal point. Mutative
+// CONTRACT: precision <= PrecisionBigDec
+// Panics if precision exceeds PrecisionBigDec
+func (d *BigDec) ChopPrecisionMut(precision int64) BigDec {
+	if precision > PrecisionBigDec {
+		panic(fmt.Sprintf("maximum BigDec precision is (%v), provided (%v)", PrecisionDec, precision))
+	}
+
+	precisionFactor := precisionFactors[precision]
+	// big.Quo truncates numbers that would have been after decimal point
+	d.i.Quo(d.i, precisionFactor)
+	d.i.Mul(d.i, precisionFactor)
+	return BigDec{d.i}
+}
+
+// ChopPrecision truncates all decimals after precision numbers after decimal point
+// CONTRACT: precision <= PrecisionBigDec
+// Panics if precision exceeds PrecisionBigDec
+func (d *BigDec) ChopPrecision(precision int64) BigDec {
+	copy := d.Clone()
+	return copy.ChopPrecisionMut(precision)
+}
+
 // DecRoundUp returns the osmomath.Dec representation of a BigDec.
 // Round up at precision end.
 // Values in any additional decimal places are truncated.
@@ -676,7 +717,7 @@ func chopPrecisionAndRoundUpBigDec(d *big.Int) *big.Int {
 	return chopPrecisionAndRoundUpMut(copy, precisionReuse)
 }
 
-// chopPrecisionAndRoundUpDec removes  sdk.Precision amount of rightmost digits and rounds up.
+// chopPrecisionAndRoundUpDec removes  PrecisionDec amount of rightmost digits and rounds up.
 // Non-mutative.
 func chopPrecisionAndRoundUpDec(d *big.Int) *big.Int {
 	copy := new(big.Int).Set(d)