--- nono/vm/bus.cpp	2026/04/29 17:04:31	1.1.1.2
+++ nono/vm/bus.cpp	2026/04/29 17:04:38	1.1.1.4
@@ -1,6 +1,7 @@
 //
 // nono
-// Copyright (C) 2017 isaki@NetBSD.org
+// Copyright (C) 2020 nono project
+// Licensed under nono-license.txt
 //
 
 #include "bus.h"
@@ -32,7 +33,9 @@ vm_phys_read_16(uint32 addr)
 {
 	uint64 data;
 
-if ((addr & 1))PANIC("unaligned access $%08x", addr);
+	if (__predict_false(addr & 1))
+		PANIC("unaligned access $%08x", addr);
+
 	if (addr < ram_size) {
 		data = *(uint16 *)&ram[HLW(addr)];
 	} else {
@@ -47,7 +50,8 @@ vm_phys_read_32(uint32 addr)
 {
 	uint64 data;
 
-if ((addr & 3))PANIC("unaligned access $%08x", addr);
+	if (__predict_false(addr & 3))
+		PANIC("unaligned access $%08x", addr);
 
 	if (addr < ram_size) {
 		data = *(uint32 *)&ram[addr];
@@ -73,7 +77,9 @@ vm_phys_write_8(uint32 addr, uint32 data
 uint64
 vm_phys_write_16(uint32 addr, uint32 data)
 {
-if ((addr & 1))PANIC("unaligned access $%08x", addr);
+	if (__predict_false(addr & 1))
+		PANIC("unaligned access $%08x", addr);
+
 	if (addr < ram_size) {
 		*(uint16 *)&ram[HLW(addr)] = data;
 		return 0;
@@ -86,7 +92,9 @@ if ((addr & 1))PANIC("unaligned access $
 uint64
 vm_phys_write_32(uint32 addr, uint32 data)
 {
-if ((addr & 3))PANIC("unaligned access $%08x", addr);
+	if (__predict_false(addr & 3))
+		PANIC("unaligned access $%08x", addr);
+
 	if (addr < ram_size) {
 		*(uint32 *)&ram[addr] = data;
 		return 0;