UPDATE fix64 DivPrecise

Author: camry

fix64/fix64.go

@@ -228,6 +228,10 @@ func nlz(v uint64) int32 {
 
 // DivPrecise Divides two FP values.
 func DivPrecise(argA, argB int64) int64 {
+    if argB == MinValue || argB == 0 {
+        return 0
+    }
+
     signDif := argA ^ argB
 
     const b uint64 = 0x100000000 // Number base (32 bits)

fix64/fix64_test.go

@@ -3,8 +3,9 @@ package fix64_test
 import (
     "testing"
 
-    "github.com/camry/fp/fix64"
     "github.com/stretchr/testify/assert"
+
+    "github.com/camry/fp/fix64"
 )
 
 func TestAdd(t *testing.T) {
@@ -40,6 +41,12 @@ func TestDiv(t *testing.T) {
     assert.Equal(t, fix64.ToFloat32(fix64.Div(f1, f2)), float32(470.13297))
 }
 
+func TestDivPrecise(t *testing.T) {
+    f1 := fix64.FromInt32(2147483647)
+    f2 := fix64.FromFloat32(4567822)
+    assert.Equal(t, fix64.ToFloat32(fix64.DivPrecise(f1, f2)), float32(470.13297))
+}
+
 func TestFix64(t *testing.T) {
     f1 := fix64.FromInt32(300)
     f2 := fix64.FromInt32(10)