Added x86 package

src/sizeof/Signed.go

@@ -0,0 +1,22 @@
+package sizeof
+
+import "math"
+
+// Signed tells you how many bytes are needed to encode this signed number.
+func Signed[T int | int8 | int16 | int32 | int64](number T) int {
+	x := int64(number)
+
+	switch {
+	case x >= math.MinInt8 && x <= math.MaxInt8:
+		return 1
+
+	case x >= math.MinInt16 && x <= math.MaxInt16:
+		return 2
+
+	case x >= math.MinInt32 && x <= math.MaxInt32:
+		return 4
+
+	default:
+		return 8
+	}
+}

src/sizeof/Signed_test.go

@@ -0,0 +1,21 @@
+package sizeof_test
+
+import (
+	"math"
+	"testing"
+
+	"git.urbach.dev/cli/q/src/sizeof"
+	"git.urbach.dev/go/assert"
+)
+
+func TestSigned(t *testing.T) {
+	assert.Equal(t, sizeof.Signed(0), 1)
+	assert.Equal(t, sizeof.Signed(math.MinInt8), 1)
+	assert.Equal(t, sizeof.Signed(math.MaxInt8), 1)
+	assert.Equal(t, sizeof.Signed(math.MinInt16), 2)
+	assert.Equal(t, sizeof.Signed(math.MaxInt16), 2)
+	assert.Equal(t, sizeof.Signed(math.MinInt32), 4)
+	assert.Equal(t, sizeof.Signed(math.MaxInt32), 4)
+	assert.Equal(t, sizeof.Signed(math.MinInt64), 8)
+	assert.Equal(t, sizeof.Signed(math.MaxInt64), 8)
+}

src/sizeof/Unsigned.go

@@ -0,0 +1,22 @@
+package sizeof
+
+import "math"
+
+// Unsigned tells you how many bytes are needed to encode this unsigned number.
+func Unsigned[T uint | uint8 | uint16 | uint32 | uint64 | int | int8 | int16 | int32 | int64](number T) int {
+	x := uint64(number)
+
+	switch {
+	case x <= math.MaxUint8:
+		return 1
+
+	case x <= math.MaxUint16:
+		return 2
+
+	case x <= math.MaxUint32:
+		return 4
+
+	default:
+		return 8
+	}
+}

src/sizeof/Unsigned_test.go

@@ -0,0 +1,19 @@
+package sizeof_test
+
+import (
+	"math"
+	"testing"
+
+	"git.urbach.dev/cli/q/src/sizeof"
+	"git.urbach.dev/go/assert"
+)
+
+func TestUnsigned(t *testing.T) {
+	assert.Equal(t, sizeof.Unsigned(0), 1)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint8), 1)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint8+1), 2)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint16), 2)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint16+1), 4)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint32), 4)
+	assert.Equal(t, sizeof.Unsigned(math.MaxUint32+1), 8)
+}