From dc6e3ae419dfefaceee57592525c7d1bf9f4ca4c Mon Sep 17 00:00:00 2001
From: "B. Watson" <urchlay@slackware.uk>
Date: Tue, 25 Oct 2022 05:28:20 -0400
Subject: Micro-optimization: inline spawn subroutine.

---
 dla.s | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/dla.s b/dla.s
index 0c4b452..89c466a 100644
--- a/dla.s
+++ b/dla.s
@@ -173,7 +173,11 @@ wl:
  jsr plot
 
 next_particle:
- jsr spawn         ; spawn a new particle
+ ldy RANDOM ; spawn a new particle
+ lda (spawn_x),y
+ sta part_x
+ lda (spawn_y),y
+ sta part_y
  jsr drunkwalk     ; walk it around
  beq next_particle ; if it went out of bounds, try again
 
@@ -478,22 +482,22 @@ unplot:
 ;;; check the pixel at (cursor_x, cursor_y)
 ;;; if set, return with Z=0
 ;;; otherwise, return with Z=1
-locate:
- jsr plotsetup
- and (pixptr),y
- rts
-
-masks: .byte $80,$40,$20,$10,$08,$04,$02,$01
+;;;; Inlined (keep for reference)
+;locate:
+; jsr plotsetup
+; and (pixptr),y
+; rts
 
 ;;; Subroutine: spawn
 ;;; Pick a random point on the edge of a circle
-spawn:
- ldy RANDOM
- lda (spawn_x),y
- sta part_x
- lda (spawn_y),y
- sta part_y
- rts
+;;;; Inlined (keep for reference)
+; spawn:
+;  ldy RANDOM
+;  lda (spawn_x),y
+;  sta part_x
+;  lda (spawn_y),y
+;  sta part_y
+;  rts
 
 ;;; Subroutine: drunkwalk
 ;;; Walk the point around randomly until it either is
@@ -532,7 +536,6 @@ checkbounds:
  beq oob
  cmp max_y
  beq oob
-
  sta cursor_y
 
  ldx #0
@@ -578,8 +581,6 @@ stick:
 oob:
  rts
 
- rts
-
 ;;;;; end of executable code
 
  ; dlatbl.s is generated by perl script, mkdlatbl.pl
-- 
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