task: add slice on stack

go/2024/other/optimize/s10.go

@@ -21,7 +21,7 @@ struct sorting fields
 preallocate map (or GC ballast)
 use ints instead of floats
 Boundary checks
- Allocate the backing array of a slice on stack even if its size is larger than or equal to 64K (but not larger than 10M)
+Allocate the backing array of a slice on stack even if its size is larger than or equal to 64K (but not larger than 10M)
 Avoid unnecessary pointer dereferences in a loop
 Use index tables instead of maps which key types have only a small set of possible
 */

go/2024/other/optimize/slice_on_stack.go

@@ -0,0 +1,15 @@
+package main
+
+const N = 10 * 1024 * 1024 // 10M
+var n = N / 2
+
+func f() byte {
+	var a [N]byte // allocated on stack
+	for i := range a {
+		a[i] = byte(i)
+	}
+	var s = a[:] // a slice with 10M elements
+
+	var p = &a
+	return s[n] + p[n]
+}