From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 28 Oct 2025 04:51:04 +0000 (+0100)
Subject: enemy: guards now use jump tables instead of repeated cmps
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=5b03bb851b974cf128f9321ae1d8ed9bb729f76e;p=gbrg%2F.git

enemy: guards now use jump tables instead of repeated cmps
---

diff --git a/src/enemy.s b/src/enemy.s
index 123f625..373dc95 100644
--- a/src/enemy.s
+++ b/src/enemy.s
@@ -10,6 +10,11 @@ act_enemy_guard:
 
 #define ACT_GUARD_MOVE_FRAMES 40
 
+act_guard_state_table:
+	dw act_guard_walk_right
+	dw act_guard_shoot
+	dw act_guard_walk_left
+
 	; updates the guard enemy
 	; inputs:
 	;		de: actor ptr
@@ -39,14 +44,8 @@ act_guard_update:
 	ld hl, act_state
 	add hl, de
 	ld a, [hl]
-	cp a, ACT_GUARD_WALK_RIGHT
-	jp z, act_guard_walk_right
-
-	cp a, ACT_GUARD_SHOOT
-	jp z, act_guard_shoot
-
-	cp a, ACT_GUARD_WALK_LEFT
-	jp z, act_guard_walk_left
+	ld hl, act_guard_state_table
+	jp call_tbl
 
 	ret
 @despawn:
diff --git a/src/sys.s b/src/sys.s
index 871dded..c2d41f0 100644
--- a/src/sys.s
+++ b/src/sys.s
@@ -41,11 +41,13 @@ disableinterrutpts:
   ;   a: table index
   ; [hl]: pointer to function ptr table
   ; Note: do not call, just jp
+	;	uses:
+	;		hl, a, bc
 call_tbl:
   add a, a ; * 2
-  ld d, 0
-  ld e, a
-  add hl, de ; hl + index * 2
+  ld b, 0
+  ld c, a
+  add hl, bc ; hl + index * 2
 
   ; hl = ptr to routine table 
   ; => load functon ptr into hl