struct field reordering (minimizing padding)

2026-08-09 14:12:25 +02:00
parent 729488e702
commit 6688822de2
4 changed files with 111 additions and 15 deletions
@@ -1887,6 +1887,18 @@ Bool_Last :: struct {
 	flag bool
 }

+Optimized :: struct {
+	prefix u8
+	wide u64
+	suffix u8
+}
+
+Source_Order_C :: c_struct {
+	prefix c_uchar
+	wide c_ulong
+	suffix c_uchar
+}
+
 Opaque :: opaque
 Color :: enum {
 	red
@@ -1937,12 +1949,19 @@ main func() i32 {
 	if (sizeof!(bool) != 1) return 15
 	if (sizeof!(Bool_First) != 2) return 16
 	if (sizeof!(Bool_Last) != 2) return 17
+	optimized Optimized := Optimized{prefix = 40, wide = 72623859790382856, suffix = 41}
+	if (sizeof!(Optimized) != 16) return 18
+	if (alignof!(Optimized) != 8) return 19
+	if (sizeof!(Source_Order_C) != 24) return 20
+	if (optimized.prefix != 40) return 21
+	if (optimized.wide != 72623859790382856) return 22
+	if (optimized.suffix != 41) return 23
 	first :: make_bool_first()
-	if (!first.flag) return 18
-	if (first.byte != 41) return 19
+	if (!first.flag) return 24
+	if (first.byte != 41) return 25
 	last :: make_bool_last()
-	if (!last.flag) return 20
-	if (last.byte != 42) return 21
+	if (!last.flag) return 26
+	if (last.byte != 42) return 27
 	return 0
 }
 `